CITIZENS’RADIATION DATA MAP
OF JAPANDIGEST EDITION

Grassroots Movement Reveals Soil Contaminationin Eastern Japan in the Wake of Fukushima!
FUKUSHIMA
Daiichi Nuclear
Power Plant

3

YEARS

4,000

3,400

PEOPLESOIL SAMPLESAbout CITIZENS’ RADIATION DATAMAP OF JAPAN - Digest Edition
This booklet shows the actual amount of radioactive contamination caused by the March 2011 Fukushima Daiichi Nuclear
Power Plant accident, as revealed by Japanese citizen scientists.
In the aftermath of the accident, citizens around Japan began to question the Japanese government’s initial radiation
exposure assessment, the scope of their radioactivity measuring, and their method of information disclosure. With theaim of reducing citizen exposure to radiation, we established
Minna-no Data Site, an independent nonprofit network ofradioactivity-measuring laboratories, to conduct extensive
food measurements and release this information to the public.
More specifically, over a three-year period starting from
October 2014, we measured the concentration of radioactivity(cesium 134 and cesium 137) in the soil (in Bq/kg) as part of
the “East Japan Soil Becquerel Measurement Project” andpublicized the results online as a collection of maps.
According to legislation enacted five years after the Chernobyl accident, Russia, Ukraine, and Belarus were responsible
for measuring both air dosage (μSv/h) and soil concentration(Bq/m2). And using these measurements, the authorities wererequired to establish criteria for relocation and compensation.
The Chernobyl legislation guarantees relocation and recuperation rights to residents from areas where the exposure dose
was estimated to be above 1mSv/year.
In contrast, after the Fukushima Daiichi Nuclear Power
Plant accident, soil measurements were more or less notconducted outside of Fukushima Prefecture, and the government has only published estimated numbers of the deposition
amount of radioactive cesium and the air dose rate one meter
above the ground. The soil concentration figures releasedby the government are nothing more than estimates, and because the method of display was just an approximation, it is
impossible to correctly ascertain the actual amount of contamination in areas where citizens actually live.
In order to address this unsatisfactory state of affairs, we solicited the cooperation of citizens from around the country tohelp us carry out this soil measurement project in an attempt tofully grasp the total amount of radioactive fallout which fell oneastern Japan (excluding Hokkaido) as a result of the triple
meltdown at the Fukushima Daiichi NPP.
As a result of this investigation, we determined that theradioactive contamination was by no means limited to Fukushima Prefecture and that one hundred years from now there
will still be several highly-contaminated areas where humans
should not live.
Now, eight years after the accident, not only has the government yet to establish a criterion for radioactive concentration in the soil, but the authorities are continuing to enforce
the policy of compelling people to return to their homes if the
air dose rate goes below 20 mSv/year.

Seen from the standpoint of international standards of publichealth and radiological protection we cannot turn a blind eye
to this unacceptable situation. With the Summer Olympics
and Paralympics scheduled to be held in Tokyo in 2020, we
decided to publish this booklet in order to respond to questions
and concerns from people around the world about the current
state of radiation contamination in Japan.
This book is a digest version of our bestselling Japanesebook, Illustration: 17 Prefecture Radioactivity Map & Close
Analysis which was self-published in November 2018, and wasawarded the Japan Congress of Journalists Prize in July 2019.

With the publication of this English booklet, we are hoping to inform people around the world about the actual
amount of contamination in Japan, and at the same time,
we are calling on the Japanese government to correct
the following two problems:
CORRECTION OF THE DOUBLE STANDARD CONCERNING
RADIOACTIVE MATERIALS 100 Bq/kg AND 8,000 Bq/kg
With regards to the clearance rule for radioactive materials,
prior to the Fukushima Daiichi Nuclear Power Plant accident
if the level of radioactivity was more than 100 Bq/kg there wasa strict storage obligation.
However, with regards to radioactive contaminants derived
from the Fukushima accident, the government is permitting
anything less than 8,000 Bq/kg to be incinerated or disposedof as ordinary waste; an irresponsible policy which leads tothe unnecessary spread of radioactive materials.
We are calling on the Japanese government to correct
this double standard and are demanding a return to the preaccident clearance level of 100 Bq/kg.
Also, with regards to soil contamination, we are asking
the government to not rely simply on the air radiation dose(sieverts) as they have been doing up until now. Instead, weare calling on them to guarantee appropriate rights of evacuation and compensation that meet international standards
based on zone classification depending on the soil concentration of radioactive material.
RESTORING THE ANNUAL PUBLIC DOSE LIMIT FROM
20 mSv TO THE PRE-ACCIDENT LEVEL OF 1 mSv A YEAR.
The Japanese government has not yet cancelled the nuclear
power accident state of emergency declaration, which wasenacted on March 11th, 2011.
Based on this declaration, the public dose limit was raised
from 1mSv/year to 20 mSv/year and the government is forcefully requiring evacuees to return to their homes in areas where
the dose limit does not exceed 20 mSv/year.
We are calling on the authorities to abolish the 20mSv
standard repatriation policy and to return to the pre-accident
public standard annual dose limit of 1mSv.
Minna-no Data Site
September 2019
Citizens’ Radiation Data Map of Japan Digest Edition Project TeamCITIZENS’
RADIATION DATA MAP
OF JAPANDIGEST EDITION[ Table of Contents ]Page 2 - 3:
Page 4 - 5:
Page 6 - 7:
Page 8:Page 9:Page 10 - 11:
Page 12:Page 13:
Page 14 - 15:
Page 16:

Why Measure in becquerels?
What is the East Japan Soil Becquerel Measurement Project?
2011 Radioactivity Map of 17 Prefectures in Eastern Japan
2020 Cesium Contamination Map
2010 Radioactivity Level Before the Fukushima Accident
Estimate of Radioactive Cesium Contamination Over 100 Years
What is Minna-no Data Site?
Minna-no Data Site Measurement Accuracy Control
Minna-no Data Site Participating Measurement Laboratories
Glossary, Credits, and Acknowledgments

Fukuoka

17 年 11 月 プロジェクト報告会

The word “Contamination”
When carrying out our activities, the word “contamination”
has caused us a lot of anxiety. Over the course of our work webegan to wonder if it might be possible to not use the phrase“radioactive contamination” in the book.
When we carry out measurements of cesium 134 and cesium
137, we get results showing how many becquerels are present.
However, if we say this land is “contaminated”, then wouldn’t webe hurting the feelings of the people who live there, as well as
the people who work in the rice fields, the vegetable fields, thefarms, and the mountains? These thoughts never ceased to crossour minds.

We heard people saying things such as “I don’t want to think
about radioactivity anymore” or “I’ve decided to live as if there
was no radioactivity”, andwe realized how much the thought of
編集・レイアウト作業“radioactive contamination” was affecting their well-being.
So, after careful consideration and debate, we decided not to
use the word “contamination” in the Japanese title of this book.
However, as for the contents of the book, we could not ignore thefact that the nuclear accident spread radiation, and it was witha heavy heart that we had to spell out the facts and use the word
contaminatio throughout the text.

向けイベントにてFukushima Daiichi Nuclaer Power Plant
Unit 4 (March, 2011)
Source: TEPCO Holdings

Temporary Storage Site for Radioactive
Waste in Shirakawa City (August,2018)
土壌検体の採取
Photo © bysuzy-j photographs

Monitoring Post in Namie Town
(January, 2017) Photo by
Masayuki Ikeda, Kakuda Lab.

Data Site is often asked why we decided to measure soil
2017 年Bq/kg
2 月 (from
イギリスで展示→
radioactivity concentration
here on referred
to as becquerels) even though the Japanese government
only measured the air dose rate (from here on referred toas sieverts). We will explain our reasoning below.

Why Measure
in becquerels?
HOW DID THE JAPANESE GOVERNMENT MEASURE
RADIATION AFTER THE FUKUSHIMA DAIICHINUCLEAR POWER PLANT ACCIDENT?
To start the Japanese Ministry of Education, Culture, Sports,
Science and Technology (English acronym: MEXT) and theJapanese Nuclear Regulation Authority conducted aerial
measurements at an altitude of approximately 300 m above sea
level and calculated the air dose rate in sieverts. Then they
averaged the air dose at 1m above the ground in a diameterof 300 m to 600 m.
Finally they estimated the deposition amount of radioactive
cesium (becquerels) on the surface of the ground, and thenused these estimated figures to publish their soil contamination map.
On top of the fact that these were estimated values basedon supposition, on the government published contamination
map there is no distinction for contamination below 10,000
becquerels per square meter. Therefore, for any value lessthan this amount, there is no raw data we can use to confirm
detailed contamination.
It was for this reason that Data Site felt the need to launcha project to directly collect and measure the soil using
becquerels.

Aerial survey data
analysing software

Japanese Government’s
Soil Measuring Methodmeasured data

Nuclear Power Plant

16
17

USING CITIZENS’ SIMPLE MEASUREMENT DEVICES
28
TO MEASURE SIEVERTS
During an emergency, sieverts are useful for determining how
much radioactivity has turned up at any given location, andare also the sole important measuring unit to determine howmuch one is being exposed to radiation at any given time, or
how much the area around someone has been contaminated.
Unfortunately when measuring in sieverts, more than justradionuclides derived from the Fukushima Daiichi
18 Nuclear
19 screen.
20on the25
24 accident are displayed
Power Plant
In addition to this radiation, the total value of nuclides from past nuclear weapons testing, nuclides derived fromthe Chernobyl accident, and radiation derived
from uranium and thorium and other natural
nuclides are also all detected and displayed.

TRENDS SEEN IN HIGHLY CONTAMINATED ZONES
For a long period of time after the Fukushima accident, inhighly contaminated spaces, radiation came flying from allover and was detected by measurement devices.
Gamma rays which fly through the air do not easily decay,
and only after 200 m are they finally cut in half. In extreme cases
when faraway mountains are heavily contaminated moreradiation is detected from gamma rays emitted in the mountains than from gamma rays being emitted from directly below
one’s feet. As a result, radiation from sources other than in
the soil in the immediate vicinity can be a dominant causeof error.

TRENDS SEEN IN LOW POLLUTION ZONESIn areas where there are low levels of contamination, eventhough the contamination is much less than in highly contaminated areas, there are still acres and acres of land
contaminated with soil which contain radiation levels above
100 Bq/kg. This soil would have been placed into yellow drumcans and classified as low-level radioactive waste had thecontamination occurred prior to the Fukushima accident. However, it should be noted that is not possible to detect these lowlevels of radiation when measuring in sieverts from above theground. Only by directly measuring the soil using becquerels,
it is possible to detect such low-level soil contamination.

THE IMPORTANCE OF KNOWING SOIL
RADIATION LEVELS
Due to the above mentioned trends, even if one were to draw
a map of ground contamination from radiation derived from thenuclear power plant using sieverts, or if you were to estimate
the future state of contamination, you would not be able to fully
understand the accurate contamination in each unique location
nor would it be possible to propose concrete countermeasures.
By using a specialized device to measure in becquerels
and then calculate the attenuation of radioactive substances
adsorbed and captured in the soil, it was possible to find out
exactly how much of each nuclide came from the Fukushima
accident.
A high priority of this project was to measure the amount of
Cs-134, which has a half life of two years. By only measuring
Cs-137, which has a half life of thirty years, it would have beenvery difficult to differentiate between radioactivity derived fromprevious nuclear weapons tests, and radioactivity derived
from the Fukushima accident. With those time constraints,
and by sampling a large area and conducting measurments,
it was possible to do a becquerel attenuation correction
calculation for every measuring spot, which made it possible
to carry out a comparison of each spot and thus draw an evenmore accurate contamination map.
The reason that we thought it was necessary to conductsoil measurements over such a wide area and for a period of
three years is that we wanted to determine the real state ofradioactive contamination caused by the Fukushima accident,
and leave a record of radiation diffusion to future generations.
The fact that we have been able to publish a map with theestimated cesium contamination one hundred years fromnow, while the Japanese government has not been able to doso, is one of the biggest achievements of our becquerel measurement project.

10 cm
20 cm
5 cm

1 Liter

Minna-no Data Site’s Soil Measuring Method
Soil sampling
1 Liter (1l) = 1.06 Quarts

150~300 m above ground
Soil with radioactive
contamination*1 Meter (1 m) = 1.09 Yards = 3.28 Feet
1 m = 100 cm

300 ~600 m diameter

Ground level2

Sifting

Packing & Shipping3

Analyzing1 How to Select a Sampling Spot
If you have an air dosimeter, check the air dose of the surrounding area. Avoid hotspots, where
the air dose is extremely high, and select a sampling point where the soil has not been replaced, covered, or cleaned.

What is the East Japan Soil Becquerel Measurement Project?
As a result of the Fukushima Daiichi Nuclear Power Plant
accident on March 11, 2011, an extensive area of easternJapan was exposed to radiation.
From 2012 to 2013, a citizen group called “Soil Research
Project Iwate” collected soil samples and conductedmeasurements of radioactive soil contamination from over
300 locations in Iwate Prefecture.
In order to grasp the full extent of soil contamination ineastern Japan, Minna-no Data Site (Everyone’s Data Site)started the “East Japan Soil Becquerel Measurement Project”

Make detailed notes about the landscape, geographical condition and surrounding environment.
When examining the data at a later date these notes will be the only clues available.

Aomori, Iwate*, Akita, Miyagi, Yamagata, Fukushima, Ibaraki,
Tochigi, Gunma, Saitama, Chiba, Tokyo, Kanagawa, Yamanashi,
Nagano, Shizuoka, Niigata. (Iwate Prefecture measurements
began in 2012 by a group called “Soil Research Project Iwate”)

BACKGROUND OF THIS PROJECT
What prompted Minna-no Data Site to initiate this laborintensive project? It is not as if there was no data issued by thegovernment and other authorities, which measured the quantityof becquerels in the soil using a standardized process.
However, most of this data was not useful to citizens because of the way it was collected. For example, much of thedata came from limited areas, such as one sample taken every
several kilometers. In addition farm soil samples were taken
at a depth of 15 cm, which does not show the contamination at
the surface of the ground. Furthermore, much of the data wasmerely estimated using a formula which referenced air dose
rates measured by airplane.
Citizens wanted answers to questions such as “Where isit safe for our children to play?” or “What is the actual levelof contamination around our homes?” The lack of answers
to these questions made many people uneasy, and led to thedecision to carry out the “East Japan Soil Becquerel Measurement Project” while it was still possible to detect Cs-134,
which has a relatively short half-life. By doing so, we wereable to determine the amount of contamination brought about
by the Fukushima Daiichi NPP accident.

SOIL RESEARCH PROJECT IWATE AS A
MODEL PROJECT
When initiating the “East Japan Soil Becquerel Measurement
Project”, Data Site referenced research which had been extensively conducted by “Soil Research Project Iwate” from2012 to 2013 in Iwate Prefecture.
In this project, a laboratory based in Nagoya called C-Labo,and a citizens’ group based in Iwate called “Protect Children from Radiation Exposure Iwate” planned and promoted
the project together with the cooperation of three citizens’
measurement laboratories, “SAVE CHILD iwate”* from Iwate

Prefecture, “Kanegasaki” from Iwate Prefecture, and “Chiisaki
Hana” from Miyagi Prefecture.
The aim of the project was to get at least one sample fromeach and every municipality in Iwate Prefecture. The mothers
involved in the project chose locations which were of concern
to them, such as parks in the southern part of the(as prefecture,of J anuary 2019)and in total they carried out soil measurements in three hundred sixteen different locations. In the end, they compiled acolor-coded map which was entitled “Radiation Contamination Map of All Iwate Prefecture”*“SAVE CHILD iwate” withdrew from Data Site in May 2018.

20cm

STANDARDIZING THE SAMPLING METHODBECAME THE KEY TO SUCCESS
Before the start of the “East Japan Soil Measurement Project”, citizens brought in many soil samples, and the various participating laboratories
carried out numerous measurements. However, it
soon became apparent that the soil samples had been takenfrom different
depths, and that details about where the samples
2019 年３月 年次総会
were taken from were not necessarily clear. For this reason, it

was not possible to widely compare the results with each other.
With the start of the project we insisted on standardizing thesampling method, and by doing so it became possible to obtainvalid data which could be compared with the data collected by
MEXT (Japanese Ministry of Education, Culture, Sports, Science and Technology) or data which had been collected after
the Chernobyl nuclear accident. Thus, only soil samples taken
10
using the following standardized method22were21admitted aspart of the project sample.

※解像度が低いです。

5 Sift and Dry the Soil before Measurement

Before measuring the soil, either the person taking the sample or someone at the measurement laboratory must sift and dry the soil to remove any impurities.

ENSURING EVERYONE TAKES ACCURATE SAMPLES l Courses (held over one hundred times in various locations)to explain the sampling method
When seeking the assistance of average citizens, we publishedand made available the following tools so that everyone collect※解像度が低いです。
ed soil in the same manner, and from suitable spots.
※解像度が低いです。
※解像度が低いです。
l Sampling manual complete with photosl Comic book version of the sampling manual,complete with questions and answers※解像度が低いです。
l Video showing the correct sampling method※解像度が低いです。

Everyon e’s Data Site participating
measu ring l aboratories

26

20cm
20cm
20cm

4 Obey the Unified Sampling Depth of 5 cm
10cm
5cm
Take the surface soil at a depth of exactly 5 cm, and collect slightly
more than 1 liter of soil. This is the same depth used in samples in
20cm
Chernobyl and by MEXT. You’ll get a higher figure if you take only
*1 cm (Centimeter) = 0.39”(Inch)highly contaminated surface soil, whereas if you take deeper uncontaminated soil the figure will be relatively lower. After collecting the soil, place it inside two plasticbags and insert a ‘control slip’ with the sampling location written on it in between the two bags.

Free measurements took place from the start of the projectto the end of January 2017. Since then, measurement laboratories have been charging a flat fee of 2,000 yen (about$18 USD) per measurement.

4

5cm

10cm
10cm 5cm
10cm
5cm
5cm

Measure the air dose of the sampling point at two points (5 cm above
ground and 1m above ground) and record this data in your field notebook along with the model type of your air dosimeter.

TARGET AREAS: 17 Prefectures in Eastern Japan

書店で書籍の販売開始↓

10cm

3 Measure the Air Dose (if possible)

PERIOD OF THE PROJECT: Oct. 2014 to Sep. 201723

※解像度が低いです。

2 Be Sure to Make Notes in Your “Field Notebook”

in the seventeen prefectures in eastern Japan, where theJapanese government was carrying out radiation testing ofagricultural produce. Data Site adopted the method used by“Soil Research Project Iwate”, which was to directly measure the amount of radioactive material in becquerels per
kilogram (Bq/kg).
From October 2014 to September 2017, over 4,000 citizens
collected soil samples from over 3,400 locations with thegoal of measuring radioactive cesium in the soil and visuallyshowing these results on a map of eastern Japan.

detectors and the measureWORKING TO IMPROVE THE ACCURACY OF※解像度が低いです。
ment data was analyzed so as
SOIL MEASUREMENTS
Most of the citizen measurement laboratories use NaI Scintil- to determine a method to judge
whether or not the natural
lation Detectors (using Sodium Iodine).
When using this type of detector, depending on the make radioactive materials were inin the measurementof the detector, the measurement results can be affected if tervening
GROUP NAMEPREFECTURE
URL
results.
Over
the courseof inaSapporo Hokkaido http://yaplog.jp/sapporosok
there are low levels of radioactive cesium andhighlevelsofRadioactivity
1 Hakaru-Sapporo Citizens’ Station for Measuring※
naturally present radioactive materials. Therefore, for the im- year the judgement criteria for
Iwate
N/A
2 KANEGASAKI radioactivity citizen measurement room
plementation of this project we developed and implemented when to carry out data corMiyagi
3 Small Flowers Independent Radioaction Measurement Room
http://www.chiisakihana.ne
an accuracy control method in order to ensure the accuracy rection was established withthe goal of publishing moreof the soil measurements.
Small containers for accuracy check
Hokkaido
4
Citizens
stationTeto
Teto
Miyagi
http:/sokuteimiyagi.blog.fc
First, a test sample was prepared by mixing together contam- accurate measurement results.
inated soil from Fukushima Prefecture with uncontaminatedWith the Measurement
funds from aLab
grant from the TakagiMiyagi
Fund for Citizen
Science,
Kakudacontains
Citizens Radioactivity
http://sokuteikakuda.web.f
5 whichsoil from the Chugoku Region of southern Japanthe “Project to Improve and Examine the Accuracy of index.html
the Measurehigh amounts of natural radioactive materials such as uranium, ment of Radioactive Cesium Concentration by NaI Scintillator” examCorporation Fukushima 30-Years Project Fukushima https://fukushima-30year-p
thorium, and their daughter radionuclides. 6 Approved Specified Nonprofit
ined and verified each detector using both high concentration (lowThen this test sample soil was measured using all of the volume) samples and low concentration samples.

1

7

7

Agano Labo

Niigata

http://aganolabo.blogspot.j

http://nasutoride.jp
group called“Hotspot
HOW TO DEAL WITH HOTSPOTS 8 Nasu kibou no toriderequested the assistance of a citizen’s Tochigi
for Truth” (HIT) to carry Tochigi
out hotspot
In the project, hotspots were excluded fromcollection
Mashiko
RadioactiveInvestigators
Laboratory
N/A measure9 theThe resultsof thisStation
project havecategorizedtarget in order to compare the relative contaminationof eachTakasakiments.
Citizen’s Radioactivity
Measuring
Gunmabeen http://kurashiru.blog.fc2.co
10 KURASHIRU
2
intotwelvedifferent
patternsofhotspotsandthe actualarea on the map. On the other hand, interspersed hotspots
Ibaraki
http://sokuteiibaraki.blog.f
11 Citizens’ Radioactivity Measuring StationTsukuba
Iwate
measurement results have been published on our website:from various places could not be ignored.
Saitama
http://hsfnet.jimdo.com
12 HSF ShiminSokuteijo - Fukaya
3 entitled “Environmentally
So, a sub-project
Concentrated https://en.minnanods.net/soil/hotspot.html
Namegawa
Saitama
13 Mori-no-Sokuteishitsu
https://www.facebook.com/moBecquerel Measurement Project” was establishedand weMiyagi45

6

14Minnnano sokuteisho in chichibu

Saitama

N/A

15

NPO Asunaro Radiation Measurement Room (Asunaro Lab)Tokyo

http://lab-asunaro.jp

16

Kodomomirai Radiation Measurement Station for Children and FutureTokyo(Kodomira RMS)

http://kodomira.com

5Village in Aomori Prefecture. Although the level of Cs-134/
東日本土壌ベクレル測定プロジェクトによる
Cs-137 is low in Akita Prefecture, it has been universally de東日本土壌ベクレル測定プロジェクトによる
tected in every region of the prefecture.

「東日本1「東日本177都県マップ」
都県マップ」

East Japan Soil Becquerel Measurement Project’s

Map of 17 Prefectures in Eastern JapanThe contamination has been widely detected in Yamagata,
Yamanashi, Nagano, Shizuoka, Kanagawa and Niigata PreThe radioactive contamination shown on this map is the fectures. Yamagata Prefecture has obvious contamination
accumulation of radioactive materials released as a result on the west side of the Ou Mountains, with undeniable conof the triple explosions and various venting
events at the tamination to mushrooms, wild vegetables and bear meat to
このマップで表示している放射能汚染は、
福島第一原発から4回にわたる爆発やベントなどによって放出された大量のFukushima
Daiichi Nuclear Power Plant.
Duringthe となってその時々の気象条件によってさまざまな方向に流れ、
accident which shipping restrictions have been applied. In Yamanashi
このマップで表示している放射能汚染は、
福島第一原発から4回にわたる爆発やベントなどによって放出された大量の放射能が、放射性プルームと呼ばれる「見えない雲」
また
massiveamountsofradioactive
materials
wereemittedfrom Prefecture the radioactive plume seems to have been blocked
放射能が、
放射性プルームと呼ばれる「見えない雲」となってその時々の気象条件によってさまざまな方向に流れ、また降下沈着した結果の累積である。
the plant, forming radioactive plumes. Then, depending on by the surrounding mountains.
降下沈着した結果の累積である。
概観すると、
最も深刻な汚染は福島第一原発のサイトから北西方向にのびて伊達市、
福島市、
宮城県の丸森町まで広In northern and eastern
NaganoPrefecture, radiation
the meteorologicalconditions at the time, these plumes dis概観すると、最も深刻な汚染は福島第一原発のサイトから北西方向にのびて伊達市、
福島市、
宮城県の丸森町まで広in wild
persed invarious different directions as invisible clouds and levels exceeding the safe level have been detected
がっている。
その中心域は最大の汚染域であり今後100年間は人が立ち入るべきではない帰還困難区域（337k㎡）でmushrooms
andotherediblewild
plantssuchaskoshiabura,
eventually
fell
to
the
ground.
がっている。
その中心域は最大の汚染域であり今後100年間は人が立ち入るべきではない帰還困難区域（337k㎡）である。
7市町村約2万4千人が故郷を失った。
土壌サンプリングが出来ていないエリアなので、このマップの空白域として
a type of local mountain vegetable. In Shizuoka Prefecture,The
mostseverecontamination
can
be
seen
spreadingある。7市町村約2万4千人が故郷を失った。
土壌サンプリングが出来ていないエリアなので、このマップの空白域として注意しなければならない。
伊達市のあたりで汚染域は分岐して、一方は福島県中通りを南下し、栃木県北部、群馬県北部
from the area immediately around the Fukushima Daiichi NPP the highest level of contamination can be seen on the East
注意しなければならない。
伊達市のあたりで汚染域は分岐して、一方は福島県中通りを南下し、栃木県北部、群馬県北部
へとのびている。
中通りには福島市や郡山市などがある。福島県で最も人口が集中している地域であり、was detectedonin a northwest
direction towards Date City, Fukushima City, Izu Peninsula where serious contamination チェルノブイリ
green
tea
leavesharvested
one
year
after
the
accident.
へとのびている。
中通りには福島市や郡山市などがある。福島県で最も人口が集中している地域であり、チェルノブイリ
andMarumori
Townin
MiyagiPrefecture.
The
centerofthis
法の「移住義務」「 移住の権利」ゾーン相当地点が並んでいて、2018年に至ってもそれらの一部が残っている。100万人In
Prefecture, relatively high levels of contaminationarea
is the mostcontaminatedゾーン相当地点が並んでいて、
area and is 東日本土壌ベクレル測定プロジェクトによるdesignated as a Kanagawa
法の「移住義務」「 移住の権利」
2018年に至ってもそれらの一部が残っている。
100万人
以上の人々が深刻な初期被ばくをした可能性がある。
2
arevisibleinparts of Yokohama and in the city of Odawara. In“difficult-to-return
zone”
(337
km
)
where
humansshouldnot以上の人々が深刻な初期被ばくをした可能性がある。
栃木県北部では福島県でないというだけの理由で、除染予算もおりず健康検査も行なわれず、除染土や除染廃棄物のenter for the next one hundred years. Approximately 24,000 these cities, citizens called out the Board of Education for at栃木県北部では福島県でないというだけの理由で、除染土や除染廃棄物のto store rain water sludge
andtrying岩手県南部へ
to bury contam行き場がないままに個人宅や公共施設などに積み上げられている。
もう一方は宮城県南部、宮城県北部、
people from seven municipalities can no longer live in除染予算もおりず健康検査も行なわれず、
their tempting
inatedsoil
onthegroundsofelementary
andmiddleschools.
行き場がないままに個人宅や公共施設などに積み上げられている。
もう一方は宮城県南部、宮城県北部、
岩手県南部へhometowns 宮城県南部の丸森町、
because of this designation.
It should
be notedと北上している。
白石市、岩手県南部の一関市など2市2町も、栃木県北部と同様に無施策状態のこのマップで表示している放射能汚染は、
福島第一原発から4回にわたる爆発やベントなどによって放出された大量のIn
Niigata
Prefecture,
relatively
highlevelsofcontaminationthat it is impossible
to take原発サイトから南下して茨城県南部の霞ヶ浦南岸を汚染し、
soil samples白石市、
in this area,
and as aと北上している。
宮城県南部の丸森町、岩手県南部の一関市など2市2町も、栃木県北部と同様に無施策状態のまま放置されている。
さらに、
千葉県北西部を経て東京都、
放射能が、放射性プルームと呼ばれる「見えない雲」となってその時々の気象条件によってさまざまな方向に流れ、
また
havebeen detected
due to radioactive water which flows
resultthisregionappears
as
a
blank
area
on
the
map.
Around
まま放置されている。
さらに、原発サイトから南下して茨城県南部の霞ヶ浦南岸を汚染し、千葉県北西部を経て東京都、降下沈着した結果の累積である。
埼玉県に至る流れもある。千葉県北西部の市町では除染土を秋田県小坂町の民間処分場に運んで処分しているが、Prefecture via
Date City the contaminated area forks off概観すると、and one最も深刻な汚染は福島第一原発のサイトから北西方向にのびて伊達市、
branch ex- into the prefecture from southern Fukushima
福島市、宮城県の丸森町まで広埼玉県に至る流れもある。千葉県北西部の市町では除染土を秋田県小坂町の民間処分場に運んで処分しているが、
the
Agano
River.
Specific
examplesincludetap
water
con松戸市の除染土から8,000
Bq/kg超の汚染土がみつかって搬入禁止になったことが報道された。
tends south through the center of Fukushima
Prefecture
into
がっている。
その中心域は最大の汚染域であり今後100年間は人が立ち入るべきではない帰還困難区域（337k㎡）でtaminatedwithiodine131(Maximum
76
Bq/L)
and
radioactive
松戸市の除染土から8,000
Bq/kg超の汚染土がみつかって搬入禁止になったことが報道された。
ある。
7市町村約2万4千人が故郷を失った。
土壌サンプリングが出来ていないエリアなので、このマップの空白域として
northern Tochigi Prefecture and northern
Gunma
Prefecture.
汚染がほとんどなかったのは青森県、秋田県であるが、青森県にも放射性プルームの一部が到達し、六ケ所村の核燃
注意しなければならない。
伊達市のあたりで汚染域は分岐して、一方は福島県中通りを南下し、栃木県北部、
群馬県北部
sludgefromwater
purification
withradioactive
levelsequivThe
large
citiesof
Fukushima
andKoriyamaarelocatedin
汚染がほとんどなかったのは青森県、秋田県であるが、青森県にも放射性プルームの一部が到達し、六ケ所村の核燃
施設のモニターがそれをとらえていた。
秋田県ではCs-134/Cs-137比は低いながらも、少なからず全般に検出されている。
へとのびている。中通りには福島市や郡山市などがある。福島県で最も人口が集中している地域であり、チェルノブイリthe center of Fukushima Prefecture, called the “Nakadori Re- alent to specified nuclear waste (above 8,000 Bq/kg). As a
施設のモニターがそれをとらえていた。
秋田県ではCs-134/Cs-137比は低いながらも、少なからず全般に検出されている。
法の「移住義務」「 移住の権利」ゾーン相当地点が並んでいて、2018年に至ってもそれらの一部が残っている。
100万人
山形県、
長野県、
静岡県、
神奈川県、
新潟県に
gion.”山梨県、This is themost densely
populatedareaof Fukushima result, restrictions are being placed on shipments of wild以上の人々が深刻な初期被ばくをした可能性がある。
山形県、
山梨県、
長野県、
静岡県、
神奈川県、
新潟県に
and bear meat.
も広く汚染が認められる。
Prefecture,and evenin山形県は、
2018
there奥羽山脈の西側にare 栃木県北部では福島県でないというだけの理由で、still localities
within mountain vegetables
除染予算もおりず健康検査も行なわれず、除染土や除染廃棄物のも広く汚染が認められる。
奥羽山脈の西側に行き場がないままに個人宅や公共施設などに積み上げられている。
もう一方は宮城県南部、宮城県北部、岩手県南部へ
this area which would
be山形県は、classifiedクマ肉
as“compulsory
reloca明らかな汚染がみられ、キノコや山菜、（出荷規制）[Summary]と北上している。
宮城県南部の丸森町、白石市、岩手県南部の一関市など2市2町も、栃木県北部と同様に無施策状態の
tion”
and
“entitledtorelocation”
accordingtothelegislation
明らかな汚染がみられ、キノコや山菜、
クマ肉（出荷規制）の汚染も無視できない。
山梨県は周囲を囲む山岳地帯• Taking into consideration the wide-spreadcontamination, it
まま放置されている。さらに、原発サイトから南下して茨城県南部の霞ヶ浦南岸を汚染し、千葉県北西部を経て東京都、
enacted after the Chernobyl accident. It is possible that over
埼玉県に至る流れもある。千葉県北西部の市町では除染土を秋田県小坂町の民間処分場に運んで処分しているが、の汚染も無視できない。
山梨県は周囲を囲む山岳地帯
will
benecessary
tocontinuemeasuringfood
and soil for at
によってプルームが阻止されたものと思われる。
長野県
one million people were subjected to severe
initialexposure
松戸市の除染土から8,000
Bq/kg超の汚染土がみつかって搬入禁止になったことが報道された。
least
the
next
few
decades.
によってプルームが阻止されたものと思われる。
長野県
は長野、
北信、
東信地域でコシアブラや野生キノコで基in thisregion.
汚染がほとんどなかったのは青森県、秋田県であるが、青森県にも放射性プルームの一部が到達し、六ケ所村の核燃• 秋田県ではCs-134/Cs-137比は低いながらも、Above all, special precautions need
to be taken for wild
施設のモニターがそれをとらえていた。
少なからず全般に検出されている。
は長野、北信、東信地域でコシアブラや野生キノコで基In northern
Tochigi Prefecture,
thereis neither govern準超過するものが出ている。
静岡県では伊豆半島東部
mountainvegetables,
wild
mushrooms,
andgame meat.
山形県、山梨県、長野県、静岡県、神奈川県、新潟県にmental support for decontamination
nor healthexaminations,
準超過するものが出ている。
静岡県では伊豆半島東部
が県内で最も高い。
事故後1年目には特産品であるお茶も広く汚染が認められる。山形県は、奥羽山脈の西側に
simply because it is not part of Fukushima Prefecture. Due to
明らかな汚染がみられ、キノコや山菜、
クマ肉（出荷規制）
が県内で最も高い。事故後1年目には特産品であるお茶の汚染が深刻であった。
神奈川県は、
this, contaminated waste
has been横浜市の一部と小pilingup at private 山梨県は周囲を囲む山岳地帯
resiの汚染も無視できない。
の汚染が深刻であった。
田原市にやや高いところがある。
dences and public sites,神奈川県は、with 小中学校などの雨水再no place横浜市の一部と小to go.
によってプルームが阻止されたものと思われる。
長野県
は長野、
北信、
東信地域でコシアブラや野生キノコで基
田原市にやや高いところがある。
小中学校などの雨水再Another branch of 除染土壌の敷地内埋め立て
contamination extends north into
利用施設汚泥の校内保管、準超過するものが出ている。静岡県では伊豆半島東部
southern Miyagi Prefecture,除染土壌の敷地内埋め立て
northern Miyagi
Prefecture, and
利用施設汚泥の校内保管、を危惧した市民の教育委員会追及があった。
新潟県でが県内で最も高い。
事故後1年目には特産品であるお茶
southern Iwate Prefecture. Marumori Town
andShiroishi神奈川県は、Cityの汚染が深刻であった。
横浜市の一部と小を危惧した市民の教育委員会追及があった。
新潟県では南魚沼市にやや高い汚染がみられ、
福島県会津地方
in southern Miyagi Prefecture, as well 田原市にやや高いところがある。
as Ichinoseki City and 小中学校などの雨水再は南魚沼市にやや高い汚染がみられ、
福島県会津地方を水源とする阿賀野川が放射能を運び、水道水のI-131 havefour other municipalities in southern Iwate
Prefecture
利用施設汚泥の校内保管、除染土壌の敷地内埋め立てを危惧した市民の教育委員会追及があった。
新潟県でを水源とする阿賀野川が放射能を運び、
水道水のI
-131
also been neglected
and without governmental
supportin the
汚染（最大76Bq/L）や指定廃棄物相当の浄水汚泥がは南魚沼市にやや高い汚染がみられ、福島県会津地方
same
way as Bq/L）
the municipalities
in northern Tochigi.
汚染（最大76や指定廃棄物相当の浄水汚泥が発生した。
山菜やクマ肉の出荷規制も行なわれている。
を水源とする阿賀野川が放射能を運び、水道水のI -131
There is also a stream of contamination
which flowed
汚染（最大76 Bq/L）や指定廃棄物相当の浄水汚泥が発生した。
山菜やクマ肉の出荷規制も行なわれている。
拡散した汚染を注視し、今後も食品や土壌の放射能
south from the nuclear power plant along
the southern
coast
発生した。
山菜やクマ肉の出荷規制も行なわれている。
拡散した汚染を注視し、今後も食品や土壌の放射能測定を少なくとも数十年は継続していく必要がある。
of Kasumigaura City in southern
IbarakiPrefecture, into
拡散した汚染を注視し、今後も食品や土壌の放射能
The Result of Aircraft Monitoring Measure測定を少なくとも数十年は継続していく必要がある。
northeastern
Chiba
Prefecture,andcontinued
into
Tokyo
and
測定を少なくとも数十年は継続していく必要がある。
とりわけ山菜、キノコ、野草、ジビエは要注意である。詳
ments by MEXT and Yamagata Prefecture.
とりわけ山菜、キノコ、野草、ジビエは要注意である。詳Saitama Prefecture.
Cs-134 + Cs-137 total, Unit: Bq/kg
とりわけ山菜、キノコ、
野草、
ジビエは要注意である。詳しくは各都県のマップとその解説をご覧いただきたい。
しくは各都県のマップとその解説をご覧いただきたい。
Value converted on 15 August 2011.
Although the prefectures of Aomori and Akita received
しくは各都県のマップとその解説をご覧いただきたい。
Unit: Bq/m2 Source: https://www.pref.
「文部科学省及び山形県による航空機モニタリングの測定結果」
very little contamination from the accident, a small portion of
2011年8月15日の値に換算（Cs-134＋Cs-137合算値）「文部科学省及び山形県による航空機モニタリングの測定結果」
yamagata.jp/houshasen/file/
the radioactive plume was detected by themonitoring
posts
単位：Bq/㎡（出典：https://www.pref.yamagata.jp/
airplanemonitoring.pdf
2011年8月15日の値に換算（Cs-134＋Cs-137合算値）「文部科学省及び山形県による航空機モニタリングの測定結果」
houshasen/file/airplanemonitoring.pdf）
at the nuclear fuel reprocessing plant located in Rokkasho

2011

Cs-134 + Cs-137 total, Unit: Bq/kg • Value converted in March of 2011.

Hokkaido

17 PREFECTURES

houshasen/file/airplanemonitoring.pdf）

6

Aomori
Akita

Iwate

Yamagata

Miyagi

Niigata

Fukushima

Tochigi「東日本1 7 都県マップ」

単位：Bq/㎡（出典：https://www.pref.yamagata.jp/
2011年8月15日の値に換算（Cs-134＋Cs-137合算値）
単位：Bq/㎡houshasen/file/airplanemonitoring.pdf）（出典：https://www.pref.yamagata.jp /Radioactivity Map of
17 Prefectures in Eastern Japan

Ibaraki

Gunma

Saitama

NaganoChiba

FukuokaTokyo
Kanagawa
Osaka

Shizuoka

Yamanashi

Fukushima Daiichi
Nuclear Power Plant

200,000

200,000
150,000
150,000
100,000
100,000
30,00030,00011,000200,000
150,000
100,000
30,00011,000
3,700
800
400
200
100
50

Bq/kg

7

11,000
3,700
3,700
800
800
400
400
200
200
100
50100
50

Bq/kg
Bq/kg

Map illustration © OpenStreetMap contributor

2010年度 全国47都道府県 土壌濃度測定マップ
2010年度
全国47都道府県
土壌濃度測定マップ
このマップは、
全国47都道府県が2010年度に実施した「環境放射能水準調査」
より、
表層土壌(0－5cm)の2010年度
全国47都道府県
土壌濃度測定マップ

2020

Eastern Japan
17 PrefectureRadioactivity Measurement Map

2010

Radioactivity Level Before
the Fukushima Accident

Cs－137濃度の測定データを抽出しまとめたものです。
出典：日本分析センター「環境放射線データベース」。
このマップは、全国47都道府県が2010年度に実施した「環境放射能水準調査」
よより、
表層土壌(0－5cm)のこのマッ
プは、
全国47都道府県が2010年度に実施した「環境放射能水準調査」
り、
表層土壌(0－5cm)のCs－137濃度の測定データを抽出しまとめたものです。
出典：
日本分析センター「環境放射線データベース」。。
Cs－137濃度の測定データを抽出しまとめたものです。
出典：日本分析センター「環境放射線データベース」

This map was put together using data extracted from the “Environmental Radioactivity
Level Investigation” carried out in 2010 by each of Japan’s forty-seven prefectures.
It shows the concentration of cesium 137 in surface soil (0-5 cm).
Source: Japan Chemical Analysis Center Environmental Radiation Database
02-1
32
42

ESTIMATED VALUE OF CESIUM 137 IN JULY 2020
We have received many inquiries from overseas about radioactive contamination at the time of the 2020 Olympics, so we
prepared a map which shows the estimated value of cesium
137 derived from an attenuation calculation.

01

35
40
02-2
41
05
31
34
44
02-1
32
43
42 40
33
17
02-1
38 32
35
02-1
42
03
32
42 40
02-2
35
18
37
16 20
41
35
05
40
28
31
02-2
34
15
41
02-2
39
06
44
41
05
31
34
05
43
31
33
17
34
4643
38
44
2625 18
45
44
20
03
21
04
27
33
17
43
37
38
24
33
17 16 20 15 09
38
03
28
03
18
37
16
39
06 07
18
37 36 28
16192015
10
29
28
46
25
15
26
39
06
45
21
04
39
27
06
23
30
46
2625
46
25 24
45
21
04
22
45
3627
11 09
04
27262924
19 10
07
24 21
09
36
09 0807
36
23
30
10
13
19
29
14
10
07
29
2219
11 12
23
30
23 22
30
08
11
22
13
1411
08
08
12
14
13
14 13
12
12

This map was prepared using data from soil samples
collected during the East Japan Soil Becquerel Measurement Project over a three year period from October
2014 to September 2017. Based on the actual measurement value of Cs-137 Bq/kg on the sampling day andusing March 15, 2011 as a starting point, we did anattenuation calculation to figure out the theoreticalvalue on July 1, 2020. Then using Data Site’s originalcolor coded scale, we displayed the results of this calculation on the map. It should be noted that this map
shows attenuation based on calculation, and therefore
there is no guarantee that these values will be met.
Furthermore, the value of each sampling location
is not indicative of the typical contaminationlevel for the entire region.

47-1

47-2
47-1

01
01

01

Concentration
cesium 137 in surface soil (0-5 cm)(0-5cm)
measuredin 2010, prior
to
福島事故以前(2010 年of) の国の放射能水準調査による全国の土壌中セシウムー
137 濃度the Fukushima accident in 2011, by the National Radioactivity Level Investigation.

その他の土壌

草地

土壌

畑地

未耕地

草地

土壌

畑地

未耕地

47-2
47-1
Other
Soil年年) )の国の放射能水準調査による全国の土壌
Grassland
Soil
FarmlandUncultivatedLand
福島事故以前(2010(0-5cm)
中セシウムー
137
濃度47-1
福島事故以前(2010の国の放射能水準調査による全国の土壌(0-5cm)
中セシウムー137
濃度c OpenStreetMap
contributor
47-2
Map illustration © OpenStreetMap contributor その他の土壌
47-2
草地
土壌
畑地
未耕地
その他の土壌

c cOpenStreetMap
OpenStreetMapcontributor
contributor

Concentration of Cs-137 in surface soil (0-5 cm) measured in 2010 by the National Radioactivity Level Investigation.
福島事故以前（2010年）の国の放射能水準調査による全国の土壌(0－5cm)中セシウム－137濃度
Cs-137

Cs-137

Cs-137

Prefecture
Prefecture
Soil sampled at Cs-137 (Bq/kg) Prefecture
Soil sampled atCs-137 (Bq/kg)
Soil sampledCs-137
at (Bq/kg)
福島事故以前（2010年）の国の放射能水準調査による全国の土壌(0－5cm)中セシウム－137濃度
福島事故以前（2010年）の国の放射能水準調査による全国の土壌(0－5cm)中セシウム－137濃度(Bq/kg)(Bq/kg)(Bq/kg)Soil sampled
Prefecture

東京電力
福島第一
原子力発電所

Fukushima Daiichi
Nuclear Power Plant

2020 Tokyo Summer Olympic Games
July 24th through August 9th
Paralympics
August 25th through September 6th
The Olympic Games will take place at venues
over a wide area of Japan from Sapporo(on the northern island of Hokkaido) to thefoothills of Mt. Fuji (to the west of Tokyo).
There is particular cause for concern about
nearby soil contamination at a soccer venue
in Miyagi, at baseball and softball venues inFukushima, and at the torch relay which willcommence from the J-Village Stadium which
is located in the vicinity of the Fukushima
Daiichi Nuclear Power Plant and was used
as an accident response base at the time of
the accident. The Paralympic Games will beheld at twenty one venues in Tokyo.
8

Map illustration © OpenStreetMap contributor

Prefecture Soil sampled at surface soil
Prefecture
Soil sampled atsurface soil
surface soilat0(Bq/kg)-(Bq/kg)
5 cm
0 - 5(Bq/kg)cm
0Cs-137- 5 cm(Bq/kg)
Cs-137
Cs-137
Cs-137(Bq/kg)(Bq/kg)Cs-13701 Hokkaido
Ebetsu17
18 Fukui
Fukui City
3.1
36Prefecture
Tokushima Soil
Kamiita
Town Cs-137
N/D
sampledSoilsampledPrefecture
Prefecture
Soilsampledat
Soilsampledatsurfacesurfacesoil
surfacesoil
Prefecture
Prefecture
Prefecture
Soilsampledat
Soilsampledatsurfacesoil
surfacesoil
surfacesoil
Ebetsu17
18 Fukui
Fukui City
3.1
36 Tokushima KamiitaatTwn.
Not detectedsoil
01 Hokkaido
atGoshogawara 0 0- -5 5cm
N/D
Sakaide8cm
37 Kagawa02-1 Aomori
0 0- -58.7
0 0- -5 5cm
19 Yamanashi
Hokuto5cm
cm
cm
Not detected 19 Yamanashi
Sakaide8
8.7
37 Kagawa02-1 Aomori Goshogawara
HokutoNagano72
38
Matsuyama
19
02-2 Aomori Ebetsu
Aomori City 1717 6
20Nagano
1818
Fukui
Fukui
City
3.1
3636Ehime
Tokushima
Town
0101Hokkaido
Ebetsu
Fukui
Fukui
CityCity
3.1
Tokushima Kamiita
Kamiita
Town Not
Notdetected
detected
Hokkaido
Nagano City
72
38 Ehime
Matsuyama
19
02-2 Aomori
Aomori6
20 NaganoTakizawa Vill.
21
Gifu
Kochi City
Gifu City
39
Iwate Goshogawara
40.4 1919
4.8
Not
Sakaide817
8.7
3737Kochi
Kagawa02-1
Aomori
Yamanashi
HokutoGoshogawara
Notdetected
detected
Sakaide8
8.7
Kagawa Kochi
02-103
Aomori
HokutoTakizawa Vill.
21Yamanashi
Gifu
City
17
39 Kochi03 Iwate
40.4
Gifu City
48
Osaki
22
Shizuoka Nagano
Fujinomiya
13
40
Sawara Ward
Miyagi
City
7272
38 Fukuoka
Ehime
Matsuyama
192.3
02-2
Aomori
Aomori66 3.68 2020
NaganoNaganoCity
Ehime Sawara
Matsuyama
02-204
Aomori
AomoriOsaki
3.68
22Nagano
Shizuoka
Fujinomiya
13
4038
FukuokaWard
2.3 1904
Miyagi
Akita
City
25
23
Aichi
Tahara
1.5
41
Saga
Saga
05 Akita Takizawa
Village
2121
Gifu
Kochi
CityCity
171
39SagaKochi
0303Iwate
40.4
Gifu
City
4848
Village
Kochi
Kochi
Iwate
40.4
Gifu
City
Akita
City
25
23GifuAichi
Tahara
1.5
4139
Saga
CityCity
1 17
05 Akita Takizawa
Yamagata City 3.68 16
24
Mie
Komono Town
1.13
42
Nagasaki
Sasebo
06 Yamagata Osaki
16.3
2222
Shizuoka
Fujinomiya
13
4040Nagasaki
Fukuoka
0404Miyagi
Osaki
3.68
Shizuoka
Fujinomiya
13
Fukuoka Sawara
SawaraWard
2.3
MiyagiCity
24
Mie
KomonoTwn.
1.13
42
SaseboWard
06 Yamagata Yamagata
16
16.32.3
Fukushima
Fukushima
City
23
25
Shiga
Yasu
10.9
43
Kumamoto
40
07
Nishihara
Vill.
City
252523232325
Aichi
Tahara1.5
4141Kumamoto
Saga
Saga
0505Akita
Vill.
Akita
City City
Aichi
Tahara1.5
Saga Nishihara
SagaCity
City
Akita
Fukushima
Shiga
Yasu
10.9
43
40 11
07 FukushimaAkita
Tokai
Vill.
26
Kyoto
1.8
50
08 Ibaraki Yamagata
Fushimi Ward
44
Oita
Takeda
City
2424
Mie
Komono1.134242Oita
Nagasaki
Sasebo
0606Yamagata
16165757
Tokai
Vill.
26
Kyoto
1.8
5016.308 Ibaraki Yamagata
City
Mie
KomonoTown
1.13
Nagasaki Takeda
SaseboYamagata
FushimiTown
Ward
44
16.3
Nikko
27
Osaka
Chuo
Ward
0.829
45
MiyazakiMiyazaki
City 1.3 401.3
09
Nishihara
VillageNikko
City23232929 2525
Shiga
Yasu
10.9
4343Miyazaki
Kumamoto
0707Fukushima
Chuo
Ward
0.829
45
City
27
Osaka
09Tochigi
TochigiFukushima
Nishihara
Village
Fukushima
Fukushima
City
Shiga
Yasu
10.9
KumamotoMiyazaki
40
Maebashi
1.1
28
Hyogo
Kasai
0.97
46
Kagoshima
Ibusuki
0.56
10
Gunma
Maebashi
Ibusuki0.565050
Hyogo
Kasai
0.97
46
10 Gunma Tokai
57571.1
262628Kyoto
1.80808Ibaraki
FushimiWard
4444Kagoshima
Oita
TakedaTokaiVillage
Village
Kyoto
1.8
Ibaraki
FushimiWard
Oita
TakedaSakuraWard
6Kashihara
47-1
Okinawa
2.2
11
Saitama
29
Nara
4.15
Naha
SakuraKashihara
47-1
Okinawa
2.21.3
11 Saitama Nikko
Nara
4.15
Naha City
Chuo
Ward
0.829
4545Miyazaki
Miyazaki
29296
272729Osaka
0909Tochigi
Nikko Ward
Chuo
Ward
0.829
MiyazakiMiyazaki
City
1.3
Osaka
Tochigi
47-2 Okinawa
Okinawa UrumaUruma Not detected
N/D
Ichihara
N/D 2830
Wakayama
Shingu0.92
1247-2
Ichihara
Not
detected
Wakayama
Shingu0.92
12Chiba
Chiba Maebashi
0.56
1.1
Hyogo
Kasai
0.97
4646Kagoshima
1010Gunma
MaebashiKagoshima Ibusuki
Ibusuki
0.56
1.1
2830
Hyogo
Kasai
0.97
Gunma

ShinjukuWard
Ward 6 2.5
2.5
13
Shinjuku
13TokyoTokyo
1111Saitama
SakuraWard
Ward
6
Saitama Sakura
14
Yokosuka
4.4
14Kanagawa
Kanagawa
Yokosuka
4.4
Ichihara
Not
1212Chiba
Ichihara
Notdetected
detected
Chiba
15
Kashiwazaki
5.8
15Niigata
Niigata
Kashiwazaki
5.8
Shinjuku
2.5
1313Tokyo
ShinjukuWard
Ward
2.5
Tokyo
16
Imizu
2.1
16Toyama
ToyamaImizu
2.1
1414Kanagawa
Yokosuka
4.4
Kanagawa
Yokosuka
4.4
Kanazawa
2323
17Ishikawa
Ishikawa
Kanazawa
171515Niigata
Kashiwazaki
5.8
Niigata
Kashiwazaki
5.8

31 Tottori
Kurayoshi Not detected
N/D
MA X IMUM
Tottori
Kurayoshi
Maximum
722.272
Kashihara
47-1
292931
Nara
4.15
Naha
Kashihara
47-1Okinawa
Okinawa
2.2
Nara
4.15
Naha
N/D:
32
Ohta
15.5
MINIMUMNot detected
N/D
32 Shimane
Ohta
15.5
Minimum
Not
Detected
47-2
Okinawa
Uruma
Not
detected
3030Wakayama
Shingu0.92
47-2 Okinawa
Uruma
Not detected
Wakayama
Shingu0.92
ME DIA N
MisakiTwn.
Town
1.42
33
MedianMisaki
1.42
4.2 4.2
33 Okayama
3131Tottori
Kurayoshi
Maximum
7272
Tottori
Kurayoshi Not
Notdetected
detected
Maximum
HigashiWard
Ward
34
Hiroshima
Higashi
2.22.234 Hiroshima
3232Shimane
Ohta
15.5
Minimum
Not
Shimane
Ohta
15.5
Minimum
Notdetected
detected
35 Yamaguchi
Yamaguchi
Hagi
35
3.33.3
Hagi
MedianMisaki
Town
1.42
4.2
3333Okayama
Median1.42
4.2
Okayama Misaki Town

＊出典：原子力規制庁「環境放射線データベース https://www.kankyo-hoshano.go.jp/kl_db/servlet/com_s_index」
にて、
キーワード
「2010年、*Source:Imizu
Nuclear
Regulation Authority,
Environmental
Radiation
Database, https://www.kankyo-hoshano.go.jp/kl_db/servlet/com_s_index
Higashi
2.2
1616Toyama
2.13434Hiroshima
0－5 cm、都道府県で測定」
で検索したもの。
Hiroshima福島事故以前のセシウムｰ137の起源は大気圏内核実験とチェルノブイリ事故。
HigashiWard
Ward
2.2
Toyama 土壌、全土壌、
Imizu
2.1
and search results basedon 「検出されず～72
the following key words:
Year
2010, soil, 中央値は4.2
entire soil, 0-5cm, prefectural measurements. The origin of Cs-137
表に示した2010年は、
全国的に
Bq/kg」の範囲にあり、Bq/kgであった。
Kanazawa
2323accident is3535
Yamaguchi
Hagi
3.3
1717Ishikawa
Kanazawa
Yamaguchi
Hagi accident and3.3
Ishikawa＊＊なお、
宮城県については、
2010年の値は欠損のため、2009年の値を用いた。
prior
to the Fukushima
nuclearconsidered
to be the Chernobyl
atmospheric nuclear tests from 1945 through 1980.
**Data「環境放射線データベース
on
Miyagi Prefecture in the chart
is from 2009, due to the loss of the 2010 record.
＊出典：：
原子力規制庁にて、キーワード「2010年、＊出典
原子力規制庁「環境放射線データベース https://www.kankyo-hoshano.go.jp/kl_db/servlet/com_s_index」
https://www.kankyo-hoshano.go.jp/kl_db/servlet/com_s_index」
にて、
キーワード
「2010年、
土壌、
全土壌、
0－5
cm、
都道府県で測定」
で検索したもの。
福島事故以前のセシウムｰ137の起源は大気圏内核実験とチェルノブイリ事故。
土壌、全土壌、0－5 cm、都道府県で測定」
で検索したもの。福島事故以前のセシウムｰ137の起源は大気圏内核実験とチェルノブイリ事故。
*Source: Nuclear
Regulation
Authority,Bq/kg」
Environmental
Radiatio
Database, https://www.kankyo-hoshano.go.jp/kl_db/servlet/com_s_index
表に示した2010年は、全国的に「検出されず～72の範囲にあり、
中央値は4.2
Bq/kgであった。
表に示した2010年は、全国的に「検出されず～72
Bq/kg」の範囲にあり、Bq/kgであった。
9中央値は4.2
Search 2010年の値は欠損のため、
result based on the following
key words: Year2010, soil, entire soil, 0-5 cm, prefectural measurements＊＊なお、
宮城県については、
2009年の値を用いた。
＊＊なお、
宮城県については、
2010年の値は欠損のため、2009年の値を用いた。
The origin of Cesium 137 prior to the Fukushima accident is considered to be the Chernobyl accident and atmosphericnuclear tests from 1945 through 1980.

East
East Japan
Japan Soil
Soil Becquerel
Becquerel Measurement
Measurement Project
Project

20120
1 11
201

202
202 11

Cs-134 and Cs-137 in
Bequerel
17 prefecturesin amount
Japan of
Cesium-134 and 137 in(as of March 2011)17 prefectures in Japan(as of March 2011)

Estimated amount of
Estimated
Cs-137in 17Bequerel
prefecamount of Cesium-137
tures in Japan
in 17 prefectures inJapan

200,000

Estimate ofof Radioactive
RadioactiveCesium
CesiumContamination
ContaminationOver
Over100
100years
years
Estimate

203 11
203

20411
204

2211 11 11

150,000
100,000
30,000200,000
200,000
200,000
200,000
11,000200,000
150,000 200,000
150,000
150,000
150,000
3,700
100,000 150,000
150,000
100,000
100,000
100,000
800
100,000
100,000
30,000200,000
30,00030,000
30,000200,000
200,000
400
30,00030,00011,000150,000
11,00011,000
11,000200
150,000
150,000
11,00011,0003,700
100,000
3,700 3,700
3,700
100
100,000
100,000
3,700
3,700
800
30,000800
800 800
50
30,00030,000
800
800
400
11,000400
400 400
11,00011,000
400
400
200
Bq/kg
3,700
200
200 200
3,700
3,700
200
200
100
800
100
100 100
800100
800
100
50
50400
50
50
40050
400
200,000
50
200,000

200,000
200,000
150,000
150,000
100,000
100,000
30,00030,00011,00011,000
3,700
3,700
800
800
400
400
200
200
100
100
50
50

200
200
200
150,000
150,000
Bq/kg
Bq/kg
Bq/kg100
Bq/kg
Bq/kg
Bq/kg
100
100
100,000
100,000

50
50 30,000
50
30,000

Bq/kg
Bq/kg

Map
data
©
Map data
data ©
©
Map
Open
Street
Map
Open Street
Street Map
Map
Opencontributors
contributors
contributors

11,00011,000
3,700
3,700
800
800
400
400

Mandatory
are being
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WITHREFERENCE
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Five
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three
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exnobyl Law,Law,
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posureby establishingstrict contamination
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governmentisisimposing
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10
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MEASUREMENTS
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CONDUCTED※セシウム134とセシウム137を１対１の放出量として、総量を200％とした場合
79※セシウム134とセシウム137を１対１の放出量として、総量を200％とした場合
The map
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is a predictionof radioactive
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taminationin EasternJapan, which
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eastern Japan,
which wasdraftedfollowing
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%
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%
%
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83%
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83%83%
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79
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dictionmap,solely
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86%
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carriedby ai craft
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Cs-137 will
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whereaswhereas
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the
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Cs-137will
Cs-137will in
6363
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1 2mea3 4 5 6 72019.3
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10 11 12 13 1415 16 17 18 19 20Years2122 23 passed
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00 0
to 10.05%
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to
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9 10
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11 12
12 13
1314
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1516
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1718
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19 20
20 21222122232324
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33

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みんなのデータサイトとは

測定精度管理In 2018, the results of the “Environmental Concentration
Becquerel Measuring Project” (which identifies hotspot
measurement data) were also made public on the website. Additionally, a section on basic information about
radioactivity called “Learn” was uploaded to the Data Sitewebsite. The goal of the Data Site website is to publish
easy-to-understand data for everyone to have access to.
Measurement Laboratories participating in Data Sitecontinually carry out radioactivity measurements whileregularly confirming the measurement accuracy of theirmeasuring devices based on Data Site’s self-developed accuracy tests.
The administration of the network is carried out by asteering committee made up of members of the measurement laboratories and members of the Data Site secretariat.
Data Site is a non-profit volunteer group with no affiliation
to political parties, social groups, or religious groups.

together as ト」
a standard
kit. Every year each participating「みんなのデータサイにおける「みんなのデータサイト」
における「みんなのデータサイにおける
citizens’ laboratory carriedout measurements of the ト」
sampleMinna-no
みんなのデータサイ
トとはWhat is Minna-no
Data Site?
みんなのデータサイ
トとは
みんなのデータサイトとは Data Site

Minna-no Data Site (Everyone’s Data Site) is a network of
30 citizens’ radioactivity measurement laboratories fromall over Japan as of July 2019.
After the 2011 Fukushima accident, many independent
citizen-operated radioactivity measurement laboratories
sprang up across Japan.
In September 2013, a website called “Minna-no Data Site”
was established in an effort to integrate all of the radioactivity measurement data into a common platform and disseminate accurate information in an easy-to-understand format.
As of July 2019, the Data Site website is home to approximately 16,000 cases of food measurement data, more than
3,400 cases of soil measurement data, and 1,700 cases ofMinna-no
Data Siteenvironmental
samples (ash, river water, etc). Minna-no Data Site

みんなのデータサイトとは

5. research andarch andanalysis of
TH E FUMinna-no
NC TIO N OF Data
DATA Site
S IT Eis ofaccumulated
data
ulated Data Site has the following
four major initiatives:
4. viewing
data
data 5. research and(archive)measurement
A. To collect and publicize
radioactivity measurement data from the(archive)
analysis ofdata
participating
measurementlaboratories
accumulated

Minna-no Data Site
5. research and4. viewing
analysis ofmeasurement
accumulated
data
datadata(archive)

4. viewing
measurementdata

4. viewing
data and measuring
B. To improve
techniques of the
3. making publicdata the knowledge
2. measurement
measurement(archive)measurement data
SYSTEM
resultinput
participating
laboratories data
3. making public
Minna-no
DatapublicSite
3.measurement
makingent
users 2. measurement
measurement data
C.
To
carry
out
our
own
analysisandsurveyresearch
based
on
SYSTEM
resultinput
measurement
SYSTEM
5. research andmeasurement datalaboratories 1. measurement
users
the
collected
data
analysisof users
measurement
3. making public
2. measurement
requestment accumulatedD.
To publish
based on the resultsof our survey
laboratories 1. measurement
measurement
dataresearch
SYSTEM4.
viewing
resultinput opinions
ries data
requestwith the aim ofdata
influencing countermeasuresand resolving problems
1. measurement
measurementusers(archive)measurementdata
6. making public analysis
requestrelated to radioactive contamination.
laboratories
results and opinions
measurement
In order to make these1.initiatives
sustainable we rely on continued
6. making public analysis
requestmeasurement requests from citizens
aroundthe country.
results and opinions
3. makingpublic2. measurement
6.
makingpublicanalysis
SYSTEM measurement data
result input
results and opinions
userspublic analysis
6. makingmeasurementcases the results of the three-year-long “East Japan Soil
THE HISTORY OFresults
DATAand
SITE
opinions
laboratories
1. measurement
2011: The Fukushima
accident occurs and massive amounts of Becquerel Measurement Project” and the results of the sixrequestare emitted into the surrounding environ- year-long food measurement analysis. The book also provides
radioactive materials
ment. After the accident many grassroots radioactive measure- commentary and basic information about radioactivity.
ment laboratories
start public
springingup in various locations 2019: In July, the book is awarded the Japan Congress of
6. makinganalysisandopinionsaround Japan.results
Worriedabout
their children’s health, many Journalists Prize.
concerned citizens begin asking these laboratories to measure
DATA SITE FUTURE ACTIVITIES
their food in an effort to detect radioactive contamination.
2012: Various citizens’ groups come together and establish Using measurement data, Data Site will continue working toData Site with the aim of collecting and making public the food ward visualizing the radioactive contamination caused by themeasurement data compiled independently by each measure- nuclear accident in Fukushima and leave a record of this conment laboratory. The goal is to construct a database and pub- tamination for future generations. Data Site will continue to
distribute information to all those who require this data and,lish all of the data in the same format on a single website.
2014: In January, the “East Japan Soil Becquerel Measurement in an effort to protect the future of children everywhere
Project” (Soil Project) is conceived, and in October, with almost Data Site will continue
no budget in place, the project commences with fundraising carrying out measurement activities. We inand soil measurement activities taking place in tandem.
2017: In December, Data Site is awarded the grand prize of the tend to keep sounding“Hizumi Fund for Promotion of Information Distribution”. The the alarm to the people
awarding committee praised the citizens’ continuous efforts so that this type ofto transmit and distribute information and their efforts to accident will never be
repeated.
visualize the problem of radioactivity.
2018: In November, Data Site self-publishes “Illustration: 17
At the award presentation ceremony for theJapan Congress of Journalists Prize
Prefecture Radioactivity Map & Close Analysis” which show(August 2019) Photo by Reiko Buma

12

kit one after another and the results were evaluated using the
測定精度管理測定精度管理Measurement Accuracy
Control測定精度管理“En Number test”. If the En number wasn’t between plus 1 andminus 1, the measurement was considered a failure, and thecause was investigated.
DATA SITE DEVELOPED ITS OWN ACCURACY「みんなのデータサイト」における out the “East Japan Soil BecFurthermore,when carrying
CONTROL METHOD TO CONFIRM THATMEASUREMENTS WERE BEING DONE ACCURATELY querel Measurement Project”, a separate accuracy control
In order to record and publicize their data, all of Data Site’s method had to be developed because of the difference inparticipating measurement laboratories had to ensure that the the ranges of the measured values of food products and soil
accuracy of each and every measuring device was above an measurements. For further information about this accuracy
adequate standard. The way to guarantee this was to imple- control method, please see the introductory section about the“East Japan Soil Becquerel Measurement Project”.
ment “measurement accuracy control”.
When Data Site was established in 2012, Mr. Jyunichi
Ohnuma of C-Labo and others developed their own accuracy
control method as a way of confirming whether or not each
citizen measurement laboratory was correctly measuring
radioactive contamination in food products. The method theycame up with was to create a standard brown rice mix using
cesium-contaminated brown rice from Fukushima Prefecture.
Contaminated brown rice was mixed with non-contaminatedbrown rice into four different sample batches (3 Bq/kg, 10 Bq/kg,
50 Bq/kg, 100 Bq/kg) using a germanium semiconductor nuclide
analyzer, and the four marked samples were packaged
Standard sample kit with Fukushima brown rice

測定精度管理DETERMINING THE CAUSE OF FAILURE LED TO THE
IMPROVEMENT OF THE MEASUREMENT ACCURACY
There were a wide-ranging number of causes which resulted
in accuracy control failures. For example, in one measurementlaboratory, located on the first floor of a building, it was determined that gamma rays emitted from uranium and thorium andother natural radionuclides located within the aggregate (sandand gravel) used in concrete, and their daughter nuclides, radongas, obstructed the measurement accuracy and prevented
the improvement of the quantitative limit. The problem wasovercome by improving ventilation, washing the measurement
RAISING THE STANDARD OF
MEASURING TECHNIQUE AS A NETWORK
After the Fukushima accident many non-expert citizens rushed
to buy measuring devices and start their own measurementlabs, and consequently in the early stages there wasno shortage of elementary mistakes. In addition tomeasurement accuracy control, Data Site has
held annual technical training sessions and encouraged technical information exchange via
e-mail on a regular basis in an effort to overcome
these basic mistakes.
When making public measurement data, we would like you
to know that Data Site made use of our strength as a network
and worked hard on technological improvement in an effort
to be responsible for the numbers we publicized as citizenlaboratories.
In closing we would like to thank Mr. Tamotsu Sugenami
of the Takagi Fund for Citizen Science for his considerable
assistance in developing the accuracy control method fromthe infant stages of Data Site.
13

containers, and implementing other reinforcement measures.
Additionally, there were several instances of domesticallymanufactured measuring devices by the same manufacturer
being unable to successfully measure samples below 10 Bq/kg.
As a result of tenacious negotiations and discussions withthe manufacturer, which claimed that “the specification can
only guarantee accuracy up to 10 Bq/kg”, Data Site convinced
them to release a comprehensive improvement of the analytic
software and as a result of this reform it became possible todetect even lower values.

Sitting in the center of the boxes of bottled water
is a Nal scintillation radiation detector. Instead ofusing regular Geiger counters, we need this typeof sophisticated equipment for measuring radioactivity in food and soil. Germanium type detectors
are even more accurate, but each unit costs over
$100,000! That’s why we need your support!

An example of trying to lower the detection limit and shorten the measurement time by using a lead and iron plate and water as an additional block. (120 kg of additional lead, 42 boxes of water totaling 250 kg)

Everyon
e’sSiteData
Siteparticipating
Minna-noDatae’sParticipating
EveryonData
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Everyon
e’s
Data
Site
participating(as of J anuary 2019)
measu
ring
l
aboratories
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participating
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measu ringl aboratories
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measu ring l aboratories
measu ring l aboratories (as of J anuary 2019)1
2
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Hokkaido
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4
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Minna-no Data Site Annual Conference, March 2019

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GROUP NAMEPREFECTURE
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ATOMTEX AT1320A
1 Hakaru-Sapporo Citizens’ Station for Measuring Radioactivity in Sapporo HokkaidoPREFECTURE
GROUP NAMEURLEQUIPMENT(S)
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http://yaplog.jp/sapporosokutei
ATOMTEX
AT1320A
1 Hakaru-Sapporo
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in Sapporo
AT1320ACSK-3i
1 Hakaru-Sapporo
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Iwate Hokkaido
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ATELIERNON-ELECTRIC
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CSK-3i2
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ATOMTEX
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Q-bq (in preparation)

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Minna-no Data Site Conference, November 2017

Editing and designing
our book

Collecting soil samples
Public display in England, February 201714

Demonstration at a
public event, April 2018

Dispatch work on sales daywith support members, November 2018

Our book on display on a store shelf,
January 201915

Selling our books
at an outdoor event,May 2019

Glossary and Units
Data Site: Minna-no Data Site (Everyone’s Data Site)
MEXT: Ministry of Education, Culture, Sports, Scienceand Technology
TEPCO: Tokyo Electric Power Company
Fukushima Daiichi NPP: Fukushima Daiichi Nuclear
Power Plant (FDNPP)
Chernobyl Law: Law on Social Protection of Citizens
Exposed to Radiation Due to the Disaster at the Chernobyl Nuclear Power Plant

Cs: cesium
Sv: sievert (μSv: micro sievert, mSv: milli sievert)
Bq: becquerel
kg: kilogram
1 Centimeter (1cm) = 0.39 Inch (1”)
1 Meter (1m) = 100cm = 3.28 Feet = 1.09 Yards
1 Acre = 4,047 m2 = 43,560 Sq Ft
1 Liter (1l) = 1.06 Quarts

Minna-no Data Site (Everyone’s Data Site)
Minna-no Data Site Publishing
11-7 Ippon-Matsu Aza Iizaka Machi,
Fukushima City, Fukushima 960-0201 Japan
c/o NPO Fukushima 30-Year Project
Phone: +81(24) 573-5697

Citizens’ Radiation Data Map of Japan
Project Team

Contact: minnanods@gmail.com
CITIZENS’ RADIATION DATA MAP OF JAPANDIGEST EDITION[North America]
Coordinator: Rachel Clark
Legal Advisor: Mari Inoue
English Translation/Editing: Stephen Ready
Editing: Karen Rogers
Design/Editing: Tony Sahara

Copyright © 2019 by Minna-no Data Site
Steering Committee
All rights reserved.
No part of this publication may be reproduced,
stored in a retrieval system, or transmitted in any
form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, without
the prior permission of both the copyright ownerand the above publisher of this book.

[JAPAN]
Editing Director: Kiyumi Oyama
Editing: Nahoko Nakamura, Junichi Ohnuma, Shoko Ohnuma, Tomoko Tomizuka
Book design: Naoko Araki
Map design: Hiromi Abe

Library of Congress Cataloging-in-Publication
Data is available.
ISBN: 9784991042713

Acknowledgments:
We would like to thank the following people whohave been specially supportive in starting this book.
Jun Nakasuji
Nozomi Mizushima
Yukari Oseki
Arthur Binard

Minna-no Data Site Original Characters

16First Edition
Design by Naoko Araki and Tony Sahara
Printed by inuuniq Co., Ltd. in Japan
Fukushima
Daiichi Nuclear
Power Plant

Citizens’ Radiation Data Map of Japan
Digest Edition

2019年9月21日 第1版 1刷発行

企画・編集: みんなのデータサイト マップ集編集チーム

デザイン: 荒木直子、Tony Sahara
発行人: みんなのデータサイト

発行所: みんなのデータサイト出版〒960-0201 福島県福島市飯坂町字一本松 11-7
認定特定非営利活動法人

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電話：024-573-5697

HP：https://minnanods.net
印刷・製本: 株式会社イニュニック© みんなのデータサイト運営委員会2019

Printed in Japan

ISBN 978-4-9910427-1-3
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ISBN 978-49910427-1-3
C0030 ¥500E
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WORKING TO PROTECT ALL PEOPLE
FROM RADIATION EXPOSURE