正ⅣIRS‑RADIOAC甘‡ⅤⅠ
SURVEY∵DAinJa

ⅣUM
Ⅳ0V.

SurveyData

Radioactivity

inJapanNumber38

Ⅳ0V.1973
ContentsTHE

SURVEYCARRIEDRESULTS
OUT

BYTHE

OF

THE15THPEOPLE,S

NUCLEAR
REPUBLICOF

EXPLOSION
CHINA

Preface
GrossBeTa‑RadioactivityintheRainandtheAirboneDust｢止p∂〃仰e招Orウわg/招/4ge〃Cyノ
GrossBeta‑RadioactivityinUpperAir

岬eぶe∂化わ∂〃d伽帽/叩me根〃.α′通園/丁伽由〃Ce月卵〃Crノ
GrossBeta‑ActivityinRainandDryFa[]out｢地軸〃∂//〃正也托OfJね鱒0/og血∂/∫c由〃Ceぶノ
GrossBeta･ActivityinAirboneDusts｢/伯山〃∂//〃ざ如u紬Or/ねdo/og血/Scf抑Ce∫ノExposure

Rate｢/地軸〃∂//〃ざ血ノ拒Of斤∂㌔0わg由/ざc由〃Ce∫ノ[odine･131in

Mitk｢地軸〃∂//′了∫折u托Of/ね膚0わg正∂/Scノe〃Ce∫ノ
MonitoringPost

TESTTHESURVEYRESULTSNUCLEAR

OFTHEIEXPLOSIONTESTBYTHE

PEOPLE,SCAR二REPUBLIC

OF

PreねceThiseditionisprovidedfortheradioactivitysuIVeyreSultsoffa1lou
Chinesenuclearexplosiontest.
The27thofJunein1973,ThePeople,sRepublicofChinacarried(
nuclearexplosiontest･Concernlngthistest,atmOSPhericdisturbancewa5
thenation‑WidemeteorologicalobservatOries･The

scaleofthisexequivalenttoTNT2megatones.
Falloutradioactivitymeasurementofthistestswascarriedoutattheradioactivitysurveystationsftomthe28thofJunetothe17thofJuly.

Meantime,こOmParativelyhighradioactivitywasmeasured,i･e.,313pC

NorthernAreaalld220pCi/lofradioactivj

radioactivityinupperairatmilkatMiyaglPrefecture.
TheValuesin

radioactivity
thesurvey

results

provisionalguideofRadioactivityCountermeasuresHeadquarters.

ofthistestwereconsiderablyloⅥ
radioactivity

countermeasuresest.

GrossBeta･RadioactlV暮tytntheRainandtheAirborne
Dust
仁ねp∂∩仰ere(汀ロ/ogfc∂/月ge〃Crj
The15thnucIeartestofthePeople's
Chinawasoutcarried

ReT)ublico†believed

on27June1973.1tisthatthetestareawassomewhereintheneighhourhood
Of

Lake

Which

5.OpCi托cinvariouspIaces
bythenucIeartestwasobservedat

causedWajimaintherainsdurJngl

disturhanceabnormaJmicrot)arOgraPhic

was

as

SeVeralstationsinJapan

Thislong
explained
foIIo帆･S.

theradioactivedehrisreleasedinthe(300mbIev帥over

the centralJapantwodaysafter

rains durIng

theト10Ju[ydurlng

periodseeninfromthe28June‑11Julyperiodare

From
ZOne

3July
aroundKorea
thn柑
COVeredFigure3.andTab]e3thetoeast.awest

beta‑radioactivity
Oka

dust

radioactive

flewinonlJuLy.and6.D

causedinrelativelygrossPreVailingeas!即IY

Fuku･

WeSternJapan
Pacific.

highdetected2.4pCi/m3invalue

thesitlほti捌

July.This

pCi/m3inSendaion4Julv.

normal･However.westernJapanhadhighvaluesaga‑n

hasbeenconducted

Onthe6‑8Ju[yperiod.

Japan

COutd
networknation･Widenotdistribution

be obtained
becauseundertheof few

of the radioactive
enforced

rainfallswhichrainobservatiDnreachedtht

Winds｡
the faIlout

Surveyofgrossbeta･aC

LaterinareasnorthofKantDValuesreturnedtDalmost

Ato2Juwhichthe青;noontotheevenlngOf29J
fromtheand

ShowninTables2and3.
Japanof t300OVerJaF)aninana霊titudeo

Thedataofgrossbeta･radioactivityobtainedfrom

dust

thewithOVerJapanin

theexplosion.

airborne

normalperiodFrom27June

tropospherefirstpassedinanaltitudeofaboutlOkm

Asalmost

Of88r9days才Cねrac細is青竜

1tisestimatedfromtheairmasstraJeCtOryShownthethe values

toreturned

TahIeland

shownin

By9July

Figurel.

in Figure2thatvalue.

ト2Julyperiod.andvaIue

WeSt‑nOrthwestofTokyo.

SIighthighrelativeIy

themaximumvalue.12.0[

Nor(400N.900E).about4.000km

L叩

2.ameas･urableamountsoflmm/day.However.asseeninTab[euslng‑MeteoroIogICalAgel

Table4,The

proceduresotsanr

asthosediscribedon
Publicatio‖Series.

TabJel.TheMicrDbarographicE)isturbancesduetothe15thNucle
Testofthepeople'sRepublicofChina′27thJune,1973
Compi[edbyT.Nagai.T.HondaandK.Mori

佃即肋加用/印加/和郎叩ノpageTable2.GrossBeta･RadioactivitYinRain.1st‑10thJuIv.1973
CompiledbvT.Nagai.T.HondaandK.Mori

仙pan肋teorolqgkalA9enCyJ

upperr｡W:
Lowerrow:

July1973
12

3

45

Wakkanai

67

2.3

0.4

3.5

2.0

Sapporo0.1

Kushiro0.2

Sendai

Akita

Tokyo

Wajima03 1
4 (U 0Yonago‑1･73･0

Osaka

0

つ一9

HachijoJlma

20 7
3 0

12 0

60 0

■

Murotomisaki

FukuokaKagoshima

3.5

1.1

1.7

1生0

96.0

23.0

:ObseⅣationisnotcarriedoutbecausethedailyrainfallamountTable4.Station

S慧n

NameofStation

Sites and ObservationaHtems

Lat(N)L｡ng(E)Elevati｡n401

Wakkanai

45025̀

14lO41･2.8m

412

Sapporo43003′

14lO20･16.9m

418

Kushiro42059′

144024′

31.8m

590

Sendai

3801る′

140054′

38.4m

582

Akita

39043′

140006′9.4m

662

TokyoDistrictMet.Obs.

35041‑

139046‑6.5m

67833006′

139047′

79.7m

600

Hachijqjima
Wajima3フリ23′

136054′

5.3m

772

0saka

34041′

135031′

23.1m

744

Yonago35026′

133021′

6.5m

899

Murotomisaki

33015′

134011′184.7m807

Fukuob33035′

130023･

2.5m

827

Kagoshima

3lO34′

130033′4.3m=

Elevation:ThenumericsglVetheelevationabovemeansealevelofobservationfield.

Observationalitemsa:preCIPltationb:

airbornedust

C:

d:

Sea

VVater

Verticaldistributione:

PreCIPltationandsettleddustforchemicalanalysisf:microbarograph[igureN→heMeteOrO一〇g■Ca一→｢ajectOrYa=heti∃eWhe⊃the一望hZuc訂a｢→estwascar｢訂dOUtbYthePeOP一e､sRepubニcOfChぎa1400

Figure4℃

FalIoutObservationof
JapanMeteororog■Ca.Agency㊥BasicStation(RainandD｡St)●SuppJementarystation(Rainl

S【AOFJAPAhl

GrossBeta‑RadioactivitvinUpperAir
岬e陀∂化わ ∂〃d伽ye/叩m即r

什ロリ

止卵〃

伽知TCe

4卵川γノSince1960.Research
JapanandDevelopment

H.n.,

at

DefenseAgencyhasmeasu㌻ヨdt転beta･aCtivity

Of dustin

thelowerlaver

tropopause

us[ngaircraftsas柑ile宅tOrS.

o手偏stratospherethesametime.oneoI

SamPlingflightandtheothe
Ward flight.The differencesandradioactivity ofsamplescoIIl

Thesamplesweretakenover紬ree那eaSOfJapan

aretakenasthevalueatthef

us■ngdustsampJesattachedunderthea血aftwIngS･Figure5showsthreesar

ThesampIingflightsweremadeuslngtWOaircrafts

Resultsobtainedisshow

Table5.GrossBeta･RadioactivityinUpperAir‑June28thtoJuIy9th.1973‑
byK.Kenmochi.S.Jgarashi.K.Kitazawa.M.OnumaandY.Y

伸∬∂血∂〃d伽r〟叩冊〃r〟.β..J如∂〃加ね〃館月卵〃叩ノTake‑Off

Altitude
Flightcourse

date

time

Jun.28th

15:55

about12.5

‥

29th

lO:30

6.9〜

7.2

Tsuiki‑MG‑Tsushima‑Tsuiki
Tsuiki‑MG‑MD‑MG‑MD‑Tsuiki

･･‥

16:26

6.6〜

8.5

Tsuiki‑MG‑MD‑MG‑MD‑Tsuiki‥

30thO.7:33

9.8〜11,5Jul.

2ndlO:42

6.2

Tsuiki‑Iwakuni‑Okayama,Nagoya‑Iruma‥

3rd9:34

8.5

Iruma‑Nagoya‑Iwakuni‑Tsuiki･･

6th8:20

6.6

Tsuiki‑MG‑Tsushima‑Tsuiki

射hiO

3 凸O

10.5

Misawa‑GK‑FK‑Niigata‑Misawa

l4 4 1

8.4

Misawa‑Morioka‑GK‑FJ‑Misawa

WesternArea

Jun.

つ山

3 Ot hl4

12lO,2

Misawa‑HL‑Misawa‑Irumal■lll4

196,6

Misawa‑Miyako‑Matsushima‑Taishi‑Nikko‑Iruma

Northernl■l一l70 凸7

6.9

Iruma‑Niigata‑MisawaArea∫■l■l7 2 37.5

1stl 1 4 8

10.2

Jul.

=

Misawa‑Miyako‑Matsushima‑Taishi‑Nikko‑lruma

lllJ

l4 4 8

6.9

Iruma‑Yokote‑Misawa‥4thl 1 0

負U

7.2

Misawa‑Miyako‑Matsushima‑Taishi‑Nikko‑Iruma

=

6thl0

【J′b6.9

Misawa‑Matsushima‑Akita‑Misawa

.1400♂♂

GrossBeta‑ActivityinRainandDryFa"out｢〃占打0〃∂//〃∫一触托Of舶㌦0/og血/ぶc由〃Ce∫ノDaiLY

rain anddryfa"outsamples

werecon‑inatraYOntheroofofthebuildingoftheNational
lnstitute of RadiologlCalSciencesin
Chiba
Grosswas川308Istandi
radioactiveThe radioactivitiesofthl
hoursafterthetimeofco]fec

CitY.tOdeterminethegrossbeta･aCtivity.
beta･aCtivity

oxide

COunter.HighIynium

tinuousIY(from9A.M.tothenext9A.M.)co]]ectedThe

measureduslng

theresults obtained

Juneto8.July1973aresholura･Table6.GrossBeta･ActivityinRainandDryFa"outCo"ectedatChib‑June28thtoJuly8th.1973‑
βル血b〃βJ加rかβ〃mg〃ね/伽〃ねm血∂r由〃

仰加血朋//〃∫〟拍抒β′/ね肋/叩由/助血肥料
Grossβ‑Activity

DateofSampling∫･･July
･･

28th
29th
30th
lst

2nd

O9:00

〜

June

=〜････〜･･〜･･

L･[〜･,

July

2 9thO9:00

0

3 0 十Lh･･

0lS tll0

2nd

3rd･･

･･

0306鵬

June(mCi/Km2)7 90
2 0 80′･

3rd･･

〜･･

4th･･

11 57

･･

4th･･

〜

･･

5th･･

2 25･･

5th‥

〜･･

6th′･

3 57

･一

6th′･〜･･

7th･･

2 33

り

7th=〜･･′･〜

′‑

･∫

8th

8th
9th･･

1 10･･

0 55d劃GrossBeta･aCtivitYinAirboneDusts
仰加血闇/J〃ざ打山抒Of舶鱒0/q如C∂/ぶ亡由〃CeざノDaiIvmeasurementsofairbonedustsinsurfaceair

Tahle7

havebeenheIdsince28thJuneti]tlOthJuly･Tat)Ie7

suggests

Slightlylargerthananor

GrossBeta‑ActivitvinAirborneDusts‑June28thtoJuIylOth.1973‑

ValuesOb
after:

DateofSampling

2 8 thlstlO:00

24

2ndlO:00

24

3rdlO:00

24

4thlO:00

24

5thlO:00

=〜

‥

〜

‥

〜

=〜

‥

th

1000

3 0 th

1000

〜

1000

〜

‥

〜

,,〜

=〜

=〜

2

July

1S t

2ndlO:00

3rdlO:00
4thlO:00‥

5thlO:00‥

6tblO:00..

7thlO:00=

8thlO:00=

9thlO:00

NormalRange

‥

July

5O

8

1 3′00 4

つ山●■

0 50 830 2

24406thlO:00

24q′

0 77tblO:00

24

80 5

8thlO:00

2400

0 59thlO:00

24

1

1 330 410thlO:00

2.4.3.〜‥‥

June■只)エU

30thlO:00

2 1〜

2.3.2.L2.2.L

23〜′′,,

29th13:00

13 4 5

凸7Jl

24

2.L

June

80min.

つ山
424l

■

■

5■

●

10一●

〇.1(

｢仙如〃∂//〃∫打出抒Of/ね鱒ロ/呼止∂/立由〃Ce∫ノ
Exposureatlmabovethegroundatthestationin
ShowninTable8.

Table8

ExposureRate‑June23rdtoJuJv9th.1973‑

MeasurementVal
DateofMeasurementJune

23rd29th一′=･･=30th′･･･

Tリ

1‖4〃

5′0〃

July

★

S‑nd止血血巾〃2(〃Rル)(09:30)(12:00)(17:00)(09:30)

3 3(12:00)3 4(10:20)(09:30)

3 4(17:00)(09:30)3 ′0(09:30)37th(10:00)

‑■

8th′′

9th

(09:30)(09:30)NormalValueexceptcosmicrayatthisstationis3･3pR/h‑

■

3 4●

3 5●

3 4
̲

●

●

3 3■

■

3 2
̲

00
■

lodine･131inMilk
仰加血闇//〃∫打払reof舶膚0/og/c∂/Sc由〃Ceざノ

Concentrations ofiodine･131in
termined by the NationallnstituteSciences during the period28thJune

de･weremilkofRadiologlCaI
to17thJuIy.

19丁3.

using3￠X3''Nal(TL)dandmultichannelpulse

themethod.detectablel

NIilk samples
from血lodine･131wasafarmin

wereraw

milk.which

were

taken

theNationalInstituteofAnimalAn

exampleofT･rZ

6.andobtainedresults

lndustrylocatedinthesouthernpartofChibacity.

Table9.lodin･131inMi旺‑28Jun.to17Ju]..1973‑
byH.Kamada

仰加血朋//〃∫打出抒β川∂血/印加/立血打β∫ノ
DateofSampling
2829Jun.

1973

Ioding‑131(l8 0 0●

■

L････

′ J

L･･･′′ ′L

1Jul.

･′′ ′L

2･･=′ J

L

3････■ ′L

4････

′ J

5･･･′′ ′･･′･‑････′ ■′･･･′‑････′′

10･′･･′‑

11････′′････′′

13･′･･′′

14･･′･■′15････′ ′････

′ ■

30

6
78
91216I‑

Lm↑D↑D↑D↑D↑D70芸5

(>む≡u寸.〓○寸立｣(>む≡寸um.〇)Lm(S告uむ岬US一眉ぎー〇壱眉〓b豊コ‡Su〓euO焉Z)
名付∈遥〓ナ言Monitorin9Post/〃e托OrO/呼止∂/月ge〃Cyノ
伽ねc餌帽//耶打出托∫∂〃d⊥∂血相ね√由∫ノ

Mostofthemonitoring

postsinAgencY(Asahikawa.Wajima)andin16Showedthesameas

norma[va[ue.except

Meteorolog■Cal(Asahikawa.Fukui.To

prefectures

astollows.

threesites

Table川Monitori咽Post‑Julyはto2叶19丁3‑Station

NormalValue

HiAsahikawa

15CPSFukui

16CPSTottori

20CPS

Figure7

MonitoringStation

1.Asahikawa=.Shi王uOka

2.Sapporo

12.Osaka

3.Aomori

13.Tottori

4.Miyag1

14.Shiman￠

5.Akita

15.Kochi

6.Fukushima

16.Fukuoka

T.1barakilT.S叫a8.Niigata

柑.K8gOShima

9.Wajima
lII.Fukui

SEA

OFJAPAll

8了∴

06

●

DetectionofGiantParticlesandtheVa!uesinMilk.RainandFa]lout｢触ねc山帽//〃∫打払絶∫∂〃d￡∂占酢ヨ紬r由∫ノ

Tahlell.HigMvRadioactive

Station

Date

Number

Jul.1st‑2nd

24410,720pCi

Jul,1st‑2ndl

2560pCi

Jul.1st9

Intensity

FukuiPrefecturalInstitute
OfPublicHealth
EnvironmentalPo11ution
ResearchCenterofIbaragl
ShimanePrefecturalPublic
HealthLaboratory

6800cpm(壬18000
1100,1000cpm

NiigataUniversi†yJul･2nd

313500cpm(幸4050

Jul.3rd

310158,3267.1007

KanagawaPrefecturalPublic
HealthLaboratory

Table12.[odine･131inMilk＼＼＼＼聖teofSampling
DeterminationAgency

July
4th

5th

6th

7th

8th

93

51

61

9th

lOth

llth

12th

51

91

8153

☆

909475ナ

91

81

NationalInstituteofAnimal
70

Industry(CHIBA)

135

HokkaidoNationalAgriculturalExperirnentStation(SAPPORO)No

KyushuAgriculturalExperiment
Station,Ministry{Agriculture

No.

98

No

93

51

andForestry(KUfJ7AMOTO)
NationalInstituteofRagiologicalSciences(CHIBA)

70

135

61

51

MiyagiPrefecturalInstitute184.9220.3207.3139.1120.6103.8

84.782.2

57.6

OfPublicHealth

FukushimaInstituteofHealthNo

三言…二三187･3144■3114･992･8☆

TabIe13.GrossBeta‑ActivitYinRainandDryFallout｢什eねc山ra//〃ぶ打餌托∫∂〃d⊥∂bo帽ねr由ざノUpperrow
Lowerrow

July1973
1243

7.8

1.37

653.07Ka90故山na
33.5

121.8

47.6

1.0Nagasaki

42.9
6 6
Yamaguchi

2Hiroshima

000一｣

3 9

42 ′b 1つ】
23

15 4001173′b■

Hyogo

551‑

5 7
5 1

〓99

2317 1

Tottori

Okayama

99

3 25

｢｣

′0

14一l

一

7 nO
24 0ノb 00

11 ′bO 7OO

●

●

05

Wakayama

L495′bつ]0〇一■004Osaka

一一一一

一一′0′b03
403

一一

QO 00

Fukui
19 l2
Ishikawa

一b7′0 00
2 つ一

2Aichi92

一2 2 2

一0 37
Shi2:uOka

一

1 1 1

Niigata

Kanagawa7つ】
5′b0′0一1400Figure8RainandDryFa.foutSamplingLocation

l.Fukushima

12.HYO卯

2.1baraki

13.WakaYama

3.Saitama

14.Tottori

4.TokY815･OkaYama

5.Kanagawa

16.Hiroshima

6.NiigatalT･Yamaguchi

7.tshikawa

用.Kochi

8.Fukui

19.Saga

9.Shizuoka

20.Nagasaki

川.Aichi

21.Kagoshima=.Osaka

22.Okinawa

0

OFJAPAnl