Measurement and comparison of individual external doses of
high-school students living in
Japan, France, Poland and Belarus
—the ‘D-shuttle’ project—
Hayano & Onodera, Feb 08, 2016 @ FCCJ
Ryugo Hayano, Prof. Dr., U-Tokyo
Haruka Onodera, Fukushima High School
based on the open-access paper published in“Journal of Radiological Protection” on Nov 27, 2015 co-authored by 233 high school students, teachers, and experts
49
Journal of Radiological Protection
Measurement and comparison of individual external doses of high-school students living in Japan, France, Poland and Belarus—the ‘D-shuttle’ project—
N Adachi1, V Adamovitch2, Y Adjovi3, K Aida4, H Akamatsu5, S Akiyama6, A Akli7, A Ando8, T Andrault9, H Antonietti3, S Anzai10, G Arkoun3, C Avenoso11, D Ayrault9, M Banasiewicz12, M Banaśkiewicz13, L Bernardini11, E Bernard7, E Berthet11, M Blanchard3, D Boreyko14, K Boros15, S Charron16, P Cornette9, K Czerkas15, M Dameron11, I Date17, M De Pontbriand3, F Demangeau9, ł Dobaczewski18, L Dobrzyński19, A Ducouret3, M Dziedzic20, A Ecalle9, V Edon9, K Endo21, T Endo21, Y Endo21, D Etryk12, M Fabiszewska18, S Fang4, D Fauchier9, F Felici7, Y Fujiwara10, C Gardais9, W Gaul20, L Gurin9, R Hakoda22, I Hamamatsu6, K Handa10, H Haneda10, T Hara10, M Hashimoto1, T Hashimoto8, K Hashimoto21, D Hata1, M Hattori10, R Hayano23, R Hayashi22, H Higasi5, M Hiruta6, A Honda6, Y Horikawa8, H Horiuchi24, Y Hozumi17, M Ide25, S Ihara8, T Ikoma24, Y Inohara22, M Itazu24, A Ito8, J Janvrin9, I Jout11, H Kanda5, G Kanemori5, M Kanno10, N Kanomata10, T Kato24, S Kato24, J Katsu5, Y Kawasaki21, K Kikuchi4, P Kilian26, N Kimura25, M Kiya10, M Klepuszewski15, E Kluchnikov14, Y Kodama5, R Kokubun10, F Konishi22, A Konno6, V Kontsevoy2, A Koori6, A Koutaka6, A Kowol27, Y Koyama4, M Kozioł13, M Kozue1, O Kravtchenko14, W Kruczała12, M Kudła28, H Kudo29, R Kumagai24, K Kurogome25, A Kurosu29, M Kuse25, A Lacombe3, E Lefaillet3, M Magara17, J Malinowska26, M Malinowski18, V Maroselli7, Y Masui29, K Matsukawa29, K Matsuya17, B Matusik20, M Maulny9, P Mazur27, C Miyake29, Y Miyamoto4, K Miyata1, K Miyata5, M Miyazaki30, M Molȩda20, T Morioka1, E Morita24, K Muto1, H Nadamoto5, M Nadzikiewicz28, K Nagashima29, M Nakade22, C Nakayama25, H Nakazawa17,
N Adachi et al
Measurement and comparison of individual external doses of high-school students living in Japan, France, Poland and Belarus—the ‘D-shuttle’ project—
Printed in the UK
49
JRPREA
© 2016 IOP Publishing Ltd
2016
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J. Radiol. Prot.
JRP
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Papers
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Journal of Radiological Protection
Society for Radiological Protection
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50
Y Nihei4, R Nikul2, S Niwa8, O Niwa30, M Nogi6, K Nomura29, D Ogata8, H Ohguchi31, J Ohno24, M Okabe17, M Okada22, Y Okada6, N Omi25, H Onodera10, K Onodera25, S Ooki21, K Oonishi29, H Oonuma10, H Ooshima8, H Oouchi1, M Orsucci11, M Paoli11, M Penaud9, C Perdrisot9, M Petit9, A Piskowski15, A Płocharski15, A Polis13, L Polti3, T Potsepnia14, D Przybylski12, M Pytel28, W Quillet9, A Remy3, C Robert9, M Sadowski19, M Saito10, D Sakuma1, K Sano5, Y Sasaki24, N Sato4, T Schneider32, C Schneider3, K Schwartzman2, E Selivanov14, M Sezaki25, K Shiroishi21, I Shustava14, A Śniecińska28, E Stalchenko14, A Staroń27, M Stromboni7, W Studzińska26, H Sugisaki17, T Sukegawa21, M Sumida22, Y Suzuki17, K Suzuki10, R Suzuki10, H Suzuki10, K Suzuki6, W Świderski18, M Szudejko33, M Szymaszek27, J Tada34, H Taguchi22, K Takahashi4, D Tanaka5, G Tanaka29, S Tanaka24, K Tanino4, K Tazbir13, N Tcesnokova14, N Tgawa5, N Toda6, H Tsuchiya17, H Tsukamoto8, T Tsushima1, K Tsutsumi25, H Umemura8, M Uno24, A Usui25, H Utsumi29, M Vaucelle9, Y Wada17, K Watanabe4, S Watanabe22, K Watase29, M Witkowski26, T Yamaki21, J Yamamoto4, T Yamamoto17, M Yamashita22, M Yanai21, K Yasuda22, Y Yoshida1, A Yoshida21, K Yoshimura25, M Żmijewska15 and E Zuclarelli7
1 Adachi High School, 2-347 Kakunai, Nihonmatsu, Fukushima 964-0904, Japan2 Bragin High School, Bragin, Gomel region, Belarus3 Notre Dame High School, 1 Avenue Charles de Gaulle, 92100 Boulogne- Billancourt, France4 Aizu Gakuho High School, Ikkimachi Oaza Yahata, Yahata-1-1, Aizuwakamatsu, Fukushima 965-0003, Japan5 Nada High Shool, 8-5-1 Uozakikitamachi, Higashinada-ku, Kobe, Hyogo 658-0082, Japan6 Iwaki High School, Taira Aza Takatsuki 7, Iwaki, Fukushima 970-8026, Japan7 Giocante de Casabianca High School, Avenue Jean Zuccarelli, 20200 Bastia, France8 Ena High School, 1023-1 Ohi-cho, Ena, Gifu 509-7201, Japan9 Bois d’Amour High School, 9 Rue de la Garenne, 86000 Poitiers, France10 Fukushima High School, 5-72 Moriaicho, Fukushima, Fukushima 960-8002, Japan11 Paul Vincensini High School, Rue de la Quatriéme Division Marocaine de Montagne, 20600 Bastia, France12 ZS nr 2 im. Marii Skłodowskiej-Curie, Otwock, Poland13 I LO im. J. Słowackiego, Częstochowa, Poland14 Blaise Pascal High School n°46, 14, rue de Clermont-Ferrand, 246027 Gomel, Belarus15 ZS nr 5 im. Unii Europejskiej, III LO, Ostroleka, Poland16 Institute for Radiation Protection and Nuclear Safety (IRSN), BP17,92262 Fontenay-aux-Roses Cedex, France17 Asaka High School, 5-25-63 Kaisei, Koriyama, Fukushima 963-8851, Japan18 ZS Centrum Edukacji im. Ignacego łukasiewicza, Plock, Poland
N Adachi et alJ. Radiol. Prot. 36 (2016) 49
Hayano & Onodera, Feb 08, 2016 @ FCCJ
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Hayano & Onodera, Feb 08, 2016 @ FCCJ
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D-Shuttle Project~ Measurement and Comparison
of Individual Doses of High School Students Inside and Outside of Fukushima Prefecture~
Physics team from the Super Science Club of Fukushima High School
Haruka Onodera
Hayano & Onodera, Feb 08, 2016 @ FCCJ
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Contents
1. Introduction2. Methods and materials3. Results and Discussion ⅰ Comparison of the dose rate ⅱ Comparison of the individual doses4. Conclusion
Hayano & Onodera, Feb 08, 2016 @ FCCJ
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1.Introduction
The accident at the Fukushima Daiichi Nuclear power plant→Contamination from radioactive substances
In order to understand the current situation of Fukushima
Measurement and comparison of the individual doses inside and outside of
Fukushima prefecture
Hayano & Onodera, Feb 08, 2016 @ FCCJ
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2.Methods and materials
Participants
6 schools inside the Fukushima prefecture 6 schools in other prefectures in Japan 12 overseas areas
Total of 216 people
Air dose rate (µSv/h)
Japan
FukushimaPrefecture
Fukushima Dai-ichi NPP
20 km
20 km
Boundary of the restricted zone
12 (Fukushima 0.36 µSv/h)
7 (Asaka 0.24 µSv/h) 8 (Iwaki 0.13 µSv/h)
9 (Aizu <0.1 µSv/h)
10 (Tamura 0.30 µSv/h)
11 (Adachi 0.38 µSv/h)80 km
80 km
6 (Kanagawa)
5 (Ena)
4 (Tajimi)3 (Nara)
2 (Nada)
1 (Fukuyama)
Fukushima (see Fig. 1)
Natural Radiation (µGy/h)0.127 <0.109 - 0.1270.0907 - 0.1090.0725 - 0.09070.0543 - 0.07250.036 - 0.05430.0178 - 0.0360.00571 - 0.0178
6 participating high schools in Fukushima prefecture
6 participating high schools in other prefectures
↓note: different color scales↑
(air dose rate is from the government airborne survey, as of November 2014)
note the evacuation-zone boundary (as of 2014)
(air dose rate due to natural radiation estimated from soil sample analysis, The geological society of Japan )
Fig.1
Fig.2 Hayano & Onodera, Feb 08, 2016 @ FCCJ
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Fig.6
Hayano & Onodera, Feb 08, 2016 @ FCCJ
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Instrument
Personal dosimeter (Chiyoda Technol Corporation)
“D-shuttle”
・Recording interval : 1 hour・Measured radiation type : γ-ray (also including natural radiation)・Minimum value : 0.01μSv
Hayano & Onodera, Feb 08, 2016 @ FCCJ
Method
• Participants carried D-shuttle for two weeks
• Their location was recorded in a journal
Based on the journal, the data was classified and analyzed
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Fig.8
Hayano & Onodera, Feb 08, 2016 @ FCCJ
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0
0.5
1
1.5
2
1 (Fukuyama)
2 (Nada)
3 (Nara)
4 (Tajimi)
5 (Ena)
6 (Kanagawa)
7 (Asaka)
8 (Iwaki)
9 (Aizu)
10 (Tamura)
11 (Adachi)
12 (Fukushima)
Poitiers (France)
Boulogne (France)
Bastia (France)
Belarus
Poland
mSv/y
Outside of Fukushima
EuropeInside of Fukushima
Comparison of the individual doses (annual basis)
Outside of Fukushima
Inside of Fukushima
Europe
Why are personal doses in Fukushima not much differentdespite the soil contamination?the natural background contribution happen to be lower
Fuku
yam
a
Nad
a
Nar
a
Tajim
i
Ena
Kana
gaw
a
Asak
a
Iwak
i
Aizu
Tam
ura
Adac
hi
Fuku
shim
a0
50
100
150
nGy/h or nSv/h
Outside of Fukushima Inside of Fukushima
Dose rate Personal dose distribution (natural + cesium)
estimated natural background from ■Thorium■Uranium■Potassium-40 concentration in soil samples
In Fukushima, the natural background contribution is lower than in other parts of Japan→the total doses (natural + cesium) are not much different from other parts of Japan
Hayano & Onodera, Feb 08, 2016 @ FCCJ
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Fig.12
Hayano & Onodera, Feb 08, 2016 @ FCCJ
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4. Conclusion
• We conducted an investigation to measure and compare individual doses inside and outside of Fukushima prefecture.
• At the moment, high school students in Fukushima do not suffer from significantly higher levels of radiation.
French high-school students (co-authors of the paper) came to Fukushima in August 2015 with “D-shuttle”
Hayano & Onodera, Feb 08, 2016 @ FCCJ
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26
Jul 31 Aug 01 Aug 02 Aug 03 Aug 04 Aug 05 Aug 06 Aug 070.0
0.2
0.4
0.6
0.8
1.0
Dose (incl. natural sources) µSv/h
← Fukushima →← Paris → ← Tokyo→
← Tomioka (10km!)
CDG security→
French embassy security→
D-shuttle data, 8 students, 4 teachers & experts
0.2 µSv/h→
Hayano & Onodera, Feb 08, 2016 @ FCCJ
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Jul 31 Aug 01 Aug 02 Aug 03 Aug 04 Aug 05 Aug 06 Aug 070.0
0.2
0.4
0.6
0.8
1.0
← Fukushima →← Paris → ← Tokyo→
←Miyakoji in 20-km zone
Dose (incl. natural sources) µSv/h
0.2 µSv/h→
D-shuttle data, 8 students, 4 teachers & experts
Hayano & Onodera, Feb 08, 2016 @ FCCJ
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Jul 31 Aug 01 Aug 02 Aug 03 Aug 04 Aug 05 Aug 06 Aug 070.0
0.2
0.4
0.6
0.8
1.0
← Fukushima →← Paris → ← Tokyo→
← Kunimi (60km)
Dose (incl. natural sources) µSv/h
0.2 µSv/h→
D-shuttle data, 8 students, 4 teachers & experts
Hayano & Onodera, Feb 08, 2016 @ FCCJ
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