D-Shuttle Project 訂正版.pptx

D-­‐Shu&le 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 Kota Suzuki Mikoto Kiya Ryo Suzuki Minori Saito Contents
1. IntroducIon 2. Methods and materials 3. Results and Discussion ⅰ Comparison of the dose rate ⅱ Comparison of the individual doses ⅲ Analysis of main causes of external exposure 4. Conclusion
1.IntroducIon
The accident at the Fukushima Daiichi Nuclear power plant →ContaminaIon from radioacIve substances In order to understand the current situa7on of Fukushima
Measurement and comparison of the individual doses inside and outside of Fukushima prefecture 2.Methods and materials ParIcipants
6 schools inside the Fukushima prefecture 6 schools in other prefectures in Japan 12 overseas areas Total of 215 people
Examined areas (in Japan)
In other prefecture
Inside of Fukushima prefecture
9(Aizu)
2(Nada) 3(Nara) 1(Fukuyama) 11(Adachi)
12(Fukushima)
5(Ena) 6(Kanagawa) 4(Tajimi) 7(Asaka)
10(Tamura) 8(Iwaki)
Bibliography The Geological Society of Japan Ministry of EducaIon, Culture, Sports, Science and Technology
Examined areas (overseas)
Belarus
Gomel
France
Bragin
Poland
Ostroleka
Zabki
PoiIers
Boulogne
BasIa
Warszawa
Plock
Zabrze
Otwock
Czestochowa
Instrument Personal dosimeter (Chiyoda Technol CorporaIon) 「D-­‐Shu&le」
・Recording interval : 1 hour ・Measured radiaIon type : γ-­‐ray (also including natural radia7on) ・Measurement limit value : 0.01μ㏜
Method
・ParIcipants carried D-­‐shu&le for two weeks. ・Their locaIon was recorded in a journal.
Based on the journal, the data was classified and analyzed. The data of D-­‐Shu&le Date
Dose rate
2014/06/27 15 2014/06/27 16 2014/06/27 17 2014/06/27 18 2014/06/27 19 2014/06/27 20 2014/06/27 21 2014/06/27 22 2014/06/27 23 2014/06/28 00 0.12 0.07 0.10 0.10 0.14 0.04 0.06 0.12 0.13 0.07 Loca7on
school
school
school
school
school
home
home
home
home
home
Based on dose and loca7on, the data was analyzed.
μSv/h
ⅰ Comparison of the dose rate 100 Outside of Fukushima Inside of Fukushima Overseas 10 1 0.1 Poland Belarus (The length of the whiskers is 1.5 Imes the length of the box.)
BaIsta Boulogne PoiIers 12(Fukushima) 11(Adachi) 10(Tamura) 9(Aidzu) 8(Iwaki) 7(Asaka) 6(Kanagawa) 5(Ena) ×　outliers
4(Tajimi) 3(Nara) 2(Nada) 1(Fukuyama) 0.01 μSv/h
ⅰ Comparison of the dose rate 100 10 1 0.1 0.01 Outside of Fukushima Inside of Fukushima France Belarus ×　outliers
(The length of the whiskers is 1.5 Imes the length of the box.)
Poland Discussion
Median Inside : 0.07 ~ 0.10 μSv/h　Outside : 0.06 ~ 0.12 μSv/h Overseas : 0.06 ~ 0.11 μSv/h The distribuIon of median is almost equal. Outliers were detected in all areas. The causes of outliers need figuring out parIcularly. Overseas Inside of Fukushima Outside of Fukushima Poland Belarus PoiIers Boulogne BasIa 12(Fukushima) 11(Adachi) 10(Tamura) 9(Aidzu) 8(Iwaki) 7(Asaka) 6(Kanagawa) 5(Ena) 4(Tajimi) 3(Nara) 2(Nada) 1(Fukuyama) 0.1 ⅱ Comparison of the individual doses（annual basis）
mSv/y
10 1 ⅱ Comparison of the individual doses（annual basis）
mSv/y
10 1 0.1 Outside of Fukushima Inside of Fukushima France Belarus Poland Discussion
Median Inside : 0.63 ~ 0.97 mSv/y　Outside : 0.55 ~ 0.87 mSv/y Overseas : 0.51 ~ 1.10 mSv/y The distribuIon of median is almost equal. The dose of Fukushima is almost equal to the natural radiaIon in other places. ４. Conclusion
・We conducted an invesIgaIon 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 radiaIon. Analysis of main causes of external exposure 5 (Ena)
home
school
12 (Fukushima)
home
3 (Nara)
school
home
school
school home Analysis of main causes of external exposure Check the data with the journal Analyze the main cause of external exposure Do risk management at places where people need to deal with radiaIon exposure
Bibliography The Geological Society of Japan Ministry of EducaIon, Culture, Sports, Science and Technology Acknowledgements
Prof. Ryugo Hayano (Tokyo University) CHIYODA TECHNOL COOPERATION.