Public information disclosure site: Environmental radioactivity and radiation

Environmental
Radioactivity and Radiation
In Japan

How to use this website
https://www.kankyo-hoshano.go.jp/en/

●Introduction

About this website
The website Environmental Radioactivity and Radiation in Japan publishes information on
environmental radioactivity and radiation. You can browse information such as the results ofenvironmental radioactivity surveys conducted by the Secretariat of the Nuclear Regulation
Authority with the cooperation of the relevant ministries and prefectural governments, as wellas the definitions of terms and the basic information on environmental radioactivity. This
website was completely revamped in March 2021, adopting a new website design andstructure for easier access to information by users. This revamp also supports mobile devices,
including smartphones, in consideration of the recent widespread use of smartphones. In
addition, new contents, “Radiation Around Me” and “Radioactivity Concentration in Japan”
have been added to allow you to check information around your current location using thelocation feature of mobile devices. The Environmental Radiation Database enables you tosearch for the results of environmental radioactivity surveys, as before. This guidebook will
help you to effectively and comprehensively use this website. We hope you will find thisinformation helpful.

Environmental Radiation Database

Improved search interface

Revampedfeatures

Supporting smartphones
New content using a location feature
Addition

The website: Environmental Radioactivity and Radiation in Japan
https://www.kankyo-hoshano.go.jp/en/

Computer screen

Smartphone screen

Access through
QR codeSearch and access as follows
Environmental radioactivity

2

Search for● Contents

Available contents
Utilize Radiation Data
You can search for data by using the results of environmental radioactivity surveys conducted by the Secretariatof the Nuclear Regulation Authority with the cooperation of the relevant ministries and governments, as well as
displaying information around your current location and creating charts.

P4,5

Environmental Radiation Database
You can search for data from environmental radioactivity surveys.

P6,7

Radiation Around Me

You can check the radiation information around your current location by using the location feature of your smartphone.

P8,9Radioactivity Concentration in JapanYou can check the results of radioactivity surveys conducted by the 47 prefectural governments on various samples.

P10

Create a Chart

You can create charts of air radiation dose rates, annual changes, and concentration ranges, by using the specified
search conditions.

P11

Create a Summary Table
You can create a summary table by using the specified search conditions.

Radioactivity in Food

P12,13You can check radioactivity information related to food.

Learn Radiation
Basics

Library

Archive

You can learn basic information
on radioactivity and radiation.

You can check materials anddata on environmental
radioactivity.

You can check various pastdata from the archive.

P14

P15

P15
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●Utilize Radiation Data 〉Environmental Radiation Database

Environmental Radiation Database
You can search for the results of environmental radioactivity surveys conducted by the
Secretariat of the Nuclear Regulation Authority with the cooperation of relevant ministries andprefectural governments. Data registered in the Environmental Radiation Database is checked
and assessed by specialists or staff of the relevant ministry or prefectural government.

Condition Selection
Please specify the survey period to search.

Survey Period

Any period from January 1957 to the present

Please specify the survey region to search. You can select any prefectures (multiple choice allowed).
You can also select “Nationwide” to see data for the whole country.

● Nationwide ● Prefectures ● Atmosphere, or ocean(prefectures cannot be specified)Please select one category, and make one or more selections from the subcategory list that then appears below.

Category● Airborne dust & atmosphere ● Airborne dust (continuous
measuring) ● Fallout ● Precipitation ● Inland water ● Soil
● Sediments ● Agricultural, forestry, and fisheries products● Milk ● Seawater ● Aquatic products ● Food ● Daily food
● Cumulative dose ● Monitoring post ● Survey meter ●Neutron dose rate ● Specific products, etc.

Survey Sample
ExampleSubcategory

Category● Airborne dust & atmosphere

Subcategory● Airborne dust ● High-altitude airborne
dust ● Atmosphere ● Airborne dust (highsensitivity analysis)

Please select one or more types of radionuclide to search.

Survey Nuclide●H-3 ●Sr-90 ●Cs-137 ●U ●Pu, etc.

You can select surveys to use in your search. If nothing is selected, all surveys will be included in the search.

Surveys to Use
in Your Search(Optional)● General Environment Around Us (Radioactivity level surveys conducted by the governments
and the Japan Chemical Analysis Center)● Surroundings of Nuclear Facilities (Radioactivity surveys conducted by local governments
eligible for subsidies for radiation monitoring)● Nuclear-Powered Warships (Radioactivity survey on nuclear-powered warships) 26/ Search
for the selected conditions

Search for the selected conditions

4

Mandatory item

Survey Region

●Utilize Radiation Data 〉Environmental Radiation Database

Search result example
Search results corresponding to the specified conditions will be displayed on the screen. On thispage, only the main items of the search results are shown. If you want to see other items, pleasesave the search results in CSV format.

Search Results

Save search resultsin CSV format

You can check the search conditions. You can search again for different search conditions.

Search again for different search conditions

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●Utilize Radiation Data 〉Radiation Around Me

Radiation Around Me
You can search for information on radiation around you by using the location feature ofsmartphones or by specifying a prefecture and municipality. When you click or tap on adisplayed measuring point, you can check the air radiation dose rate there.

SearchSpecify the area where you want to check the air radiation dose rate.
Access from a smartphone witha location feature

Access from smartphone/computer

Use location information

Search for current location※Please turn on the location feature.

●Prefecture ●Municipality

Use location information

SearchSpecify the measurement point (monitoring post location).

Display ofmeasurement points

Select and click your preferable measurement point
displayed on the map.

The latest measurement result of the specified measurement point will be displayed.

Display ofmeasurement results● Location of monitoring station● Air radiation dose rate
● Measurement date and time
See the results for the last year

You can check the measurement results for the last 12 months in a chart.
Placing the cursor on the chart displays the details of the measurement results.

See the results
for the last year

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● Minimum ● Average, and ● Maximum per day

●Utilize Radiation Data 〉Radiation Around Me

Search result example
By searching for an area, you can see the measurement points on the map. By clicking
your preferable measurement point, you can check the measurement results there.

Searchforarea

Specifymeasurement
point

Display of
Measurement
results
Clicking the monitoring post icon
will display a pop-up window on
the screen.

Results for the last year.

Placing the cursor on
the chart will show
the dayʼs ● Minimum● Average, and● Maximum.

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●Utilize Radiation Data 〉Radioactivity Concentration in Japan

Radioactivity Concentration in JapanYou can check the results of the radioactivity (concentration) survey on various samples
conducted by prefectures, if your device has a location feature. When you click or tap on adisplayed location, you can check the measurement results there.

SearchYou can start your search by selecting a sample or a region.

Select sample
Please select a sample from
17 samples, such as
airborne dust and the like.

Data for the selected sample will be displayedon the map.

Select a region
Search for current location* From a smartphone with a location feature●Prefecture ●Municipality

Survey point display
Select and click your preferable
survey point displayed on themap.
* The default display area is "nationwide."

Select sample
Please select a sample from
17 samples, such as
airborne dust and the like.

You can also select a region.

Select a region
Search for current location* From a smartphone with a location feature●Prefecture ●Municipality

Data for the selected sample will be displayedon the map.

Survey point display
Select and click your preferable
survey point displayed on themap.

The latest data for the selected sample/survey point will be displayed from the dataregistered in the Environmental Radiation Database.

Survey result
display8● Survey point● Radioactivity concentration of Sr-90 and Cs-137● Sampling date
● Sources of survey results

●Utilize Radiation Data 〉Radioactivity Concentration in Japan

Search result example
By searching for a sample and a region, you can see the survey points on the map.
By clicking your preferable survey point, you can check the survey results there.

Selecta sample

Selecta region

Specifya survey
point

Data
display
Clicking the survey point icon will
display a pop-up window on thescreen.

Radioactivity values vary depending on the survey location. The value shown does not
represent the radioactivity concentration for the prefecture.

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●Utilize Radiation Data 〉Create a Chart

Create a Chart
Using data registered to the Environmental Radiation Database, you can create charts of airradiation dose rates, annual changes, and concentration ranges with setting conditions. You
can easily create a chart by selecting the type of chart you want to create and then simply
following the instructions displayed on your screen. Please note that some data for theatmosphere and ocean cannot be specified for certain prefectures, and you cannot create
charts for such data.

Select Chart Type/Conditions
Air Radiation Dose Rate Chart

You can create a chart in which
air radiation dose rate (minimum,
average, and maximum) areplotted.
Condition
Selection

Mandatory

Select Measurement
Equipment

Survey Period

Survey Region

Measurement Point
Search for theselected conditions

ExampleAnnual Change Chart

Concentration Range Chart

You can create a chart in whichradioactivity concentration isplotted against time (year).

You can create a concentration
range chart by using radioactivity
concentration data.

Condition
Selection

Mandatory

Condition
Selection

Mandatory

Reference Item

Reference Item

Survey Region

Survey Period

Survey Period

Survey Region

Survey Sample

Survey Sample

Survey Nuclide

Survey Nuclide

Concentration Unit

Concentration Unit

Display Method

OptionSurveys to Use in Your Search(Optional)

Surveys to Use in Your Search(Optional)

Search for theselected conditions

ExampleSearch for theselected conditions

ExampleEdit-the-chart options: ● Change the title ● Change the maximum bound and tick interval Others: ● Display infull screen ● Print out the chart ● Download ● Print out the page FAQs on how to read the charts are available
on each page. Please see such pages for more detail.

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●Utilize Radiation Data 〉Create a Summary Table

Create a Summary Table
You can create a summary table by specifying survey years and the survey area. You caneasily create a summary table by simply following the instructions displayed on your screen.

Condition Selection
Summary Unit

● Prefecture, year

Handling of ND● Count ND as zero ● Do not include ND data

（Not Detected）● Year, prefecture

Any period from 1957 to the present

Survey Region● Prefecture ● Nationwide

Category

Survey Sample

Subcategory● Airborne dust & atmosphere , etc.
● Airborne dust ● High-altitude airborne dust
● Atmosphere Airborne dust (high-sensitivity
analysis) , etc.

Survey Nuclide●H-3 ●Sr-90 ●Cs-137 ●U ●Pu

Concentration Unit

●mBq/m3

Surveys to Use in Your Search(Optional)

Mandatory item

Survey Period●mBq/m3, etc.

, etc.

● General Environment Around You

Search for the selected conditions
Example● You can save the search results in CSV format.
● Filtering conditions are displayed.
● You can regenerate the chart and/or table fordifferent search conditions.

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●Utilize Radiation Data 〉 Radioactivity in FoodRadioactivity in Food
Information on radioactivity related to food is available here. You can check the level ofradioactivity in various food and committed effective doses for evaluating the impact ofradioactivity taken into our bodies through food consumption.

Select Chart Type/Conditions
Search by Food

Search by Region

Search by Nuclide

You can select the foodto check the radioactivity
level of that food.

You can select a prefecture
to check the radioactivity
level of food sampled in that
prefecture.

You can select a nuclide tocheck the radioactivity levelof that nuclide in foods.

Condition
Selection

Condition
Selection

Condition
Selection

Mandatory
item

Mandatory
item

Mandatory
item

Select Food

Survey Region

Survey Nuclide

Survey Nuclide

Select Food

Select Food

Data Type

Survey Nuclide

Survey Region

Survey Region

Data Type

Data Type

Survey Period

Survey Period

Survey Period

Search for theselected conditions

Search for theselected conditions

Search for theselected conditions

ExampleAnnualChangedata

Concentration
range
data

Display contents: ● Chart of search results ● Summary table of search result data by item ● Committed effective dose ● Source ofsurvey results ● Filtering conditions
Others: ● Display in full screen ● Print out the chart ● Download ● Print out the page
* In filtering conditions, you can regenerate the chart and/or table for different search conditions.

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●Utilize Radiation Data 〉 Radioactivity in Food

OthersRadiation Dose Received from Food (Committed Effective Dose)
Some radioactive materials are widely present in nature and contained in food.
Through consumption of food, such radioactive materials are taken into the tissuesof our bodies. By this, while small in quantity, we receive radiation inside our bodies
on a daily basis (internal exposure). The standard used for evaluating the impact ofinternal exposure is called committed effective dose, which is explained here.

What is Committed Effective Dose?

Committed effective dose is explained in detail.
● What is Committed Effective Dose?
● Committed Effective Dose Calculation
Formula● Presuppositions of Committed Effective
Dose Calculation● About potassium 40 (K-40)

Committed Effective Dose by Food Category
You can check the committed effective dose by
food category.
● Committed Effective Dose by Food
Category● Comparison with Various Radiation
Sources● Radiation Dose from Daily Food13

●Learn Radiation Basics

Learn Radiation Basics
You can learn basic information on radioactivity and radiation.

What is radioactivity? What is radiation?
Environmental radioactivity and radiation Q&A.
■ What is radioactivity?
■ What happens when radiation hits an object?
■ Why is radiation emitted? ,etc.

Radiation Around UsRadiation around us, including radiation that exists in nature andartificial radiation that is used in medicine, is explained in an easy-tounderstand manner.
■ What kinds of radiation are present around us?
■ What is artificial radiation?
■ What are uranium and thorium? ,etc.

Environmental Radiation Glossary of Terms
Terms commonly encountered when talking about environmental
radioactivity and radiation are explained here.
■ List of terms in alphabetical order■ More than 100 terms are included* Easy-to-understand description using photos and illustrations

Basics of Environmental Radioactivity Measurement
How to collect and pretreat analysis samples, and how to measureenvironmental radioactivity and radiation are explained.
■ Collection and Pretreatment of Samples(Explanation on each sample such as airborne dust
and soil)■ Environmental Radioactivity Analysis andEnvironmental Radiation Measurement

Explained in Text
Environmental radioactivity and radiation are explained in text foreasier understanding.
■ What is radiation? What is radioactivity?
■ Is it possible to measure radiation in the generalenvironment?
■ What are naturally occurring radioactive materials?
What are artificial radioactive materials?

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●Library and Archive

Library
You can check materials and data on environmental radioactivity.

Radioactivity Survey on Nuclear Powered Warships
The Secretariat of the Nuclear
Regulation Authority conducts
surveys on radioactivity levels at
ports nuclear powered warships
call in, with the cooperation of
relevant entities including local
governments, the Japan Coast
Guard, and the Fisheries Agency.
Here, you can check the survey
results.

Nuclear Powered Warship
Departure andPost-departure Survey
Nuclear-Powered Warship
Departure and Post-departure
Survey You can check theresults of radioactivity surveys
conducted at Yokosuka,
Sasebo, and Kin-Nakagusuku
Ports on and after departure ofa nuclear-powered warship.

Periodic Surveys on
Nuclear Powered Warships

Results of Analyses inRadioactivity Surveys on
Nuclear Powered Warships

You can check the results ofradioactivity surveys conductedquarterly (four times a year) at

Results of analyses in

the Yokosuka, Sasebo, andKin-Nakagusuku Ports.

The Series of Environmental Radioactivity
Measuring Methods
The Series of Environmental Radioactivity
Measuring Methods is available here fordownloading in PDF format.
■No.1 Measurement of Gross Beta
Radioactivity (3rd edition)

␚■No.35 Environmental Sample Collection
Methods in Emergency* And other technical references

radioactivity surveys on nuclear
powered warships are listed
here by fiscal year.

Environmental Radioactivity
Survey Reports
Reports of environmental radioactivity surveys are published.
■Environmental Radioactivity Survey and Study Result
Presentation Conference■Environmental Radioactivity Level Surveys■Marine Environment Radioactivity Comprehensive Evaluation
Project Marine Radioactivity Surveys■Environmental Survey Pertaining to the Issue of Misuse of
Depleted Uranium Ammunition

Archive
You can check various past data from the archive.
TEPCO Fukushima Daiichi
Nuclear Power Plant Accident

Past Events Envisaged by
Measurement Data

Global Radioactivity
Concentration in 2000

You can search for data related
to the accident at the TEPCO
Fukushima Daiichi Nuclear Power
Plant.

Past events that had a major impact
on the values of environmental
radioactivity concentration andradiation are explained here.

By selecting samples such as daily
food and airborne dust, you cancheck the radioactivity concentrationin the world in the year 2000.

Mandatory item

Condition Selection
Survey Sample

Radon Concentration Survey

Survey Period
Survey Region
Survey Nuclide

Search for theselected conditions

You can check the results of radon
confirmation surveys.
■Atmospheric Nuclear Tests(Mid-1940s to 1980)■Chernobyl Nuclear Power Plant
Accident (1986)■JCO Criticality Accident (1999)■Environmental Survey Pertaining
to the Issue of Misuse of Depleted
Uranium Ammunition■Indoor Radon Concentration(from April 1993 to June 1996)■Outdoor Radon Concentration(from FY1997 to FY1999)■Workplace Environment Radon Concentration(from FY2000 to FY2002)

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Public information disclosure site: Environmental radioactivity and radiation

Environmental
Radioactivity and Radiation
In Japanhttps://www.kankyo-hoshano.go.jp/en/● This website is run and managed by the Japan Chemical Analysis Center on behalf of the Secretariat of the Nuclear Regulation Authority.
● QR code is a registered trademark of DENSO WAVE INCORPORATED.

Japan Chemical Analysis Center
295 Sanno-cho, Inage-ku, Chiba City, Chiba Prefecture 263-0002

If you have any questions or inquiries about thiswebsite, please fill in the inquiry form below.
https://www.kankyo-hoshano.go.jp/en/contact-en/

2022.11