| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
We collected milk teeth from all over Japan, and investigated the transfer to the human body of radionuclides (90Sr, 238Pu, 239 + 240Pu) released to the environment at the Fukushima Daiichi Nuclear Power Plant accident (approximately 2,000). We measured and investigated 15 samples of primary teeth group {Saitama , Tokyo, Ehime (Niihama-shi, Yawatahama-shi), Kanto Region (Chiba, Saitama, Tokyo, Kanagawa), Tohoku Region (Miyagi, Yamagata, Akita, Fukushima), Osaka , Aichi , Kumamoto , South Kyushu region (Okinawa, Kagoshima)}.Although 238 Pu, 239 + 240 Pu were not detected, Stronntium-90 was not detected in the Tohoku region (disaster area) ,but Sr-90 of 4.9～ 7.6 mBq/ｇCa were detected in Tokyo , Kanto region and Kumamoto Prefecture.It was shown that this was not a nuclear accident but the effect of nuclear tests.
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| Academic Significance and Societal Importance of the Research Achievements |
日本において福島原発事故の放射能汚染の人体の影響を乳歯を用いて調査した結果,乳歯中のPuは検出されず,90Sr(生年；2002-2004)は,東京都,関東地方群,熊本県の試料群で4.9～7.6ｍBq/ｇCa検出された（2011年3月11日時点）.90Srは東北地方（被災地域）で検出されず,東京都,関東,熊本県で認められたが，試料群の大きさやバイアスが反映されたものである.これらは,乳歯形成時期や90Srの土壌分布から鑑みて，事故以前に蓄積されたものであり,現時点では事故後の人体への影響はないことが明らかにされつつある.生年別,地域別に継続して調査していることは今後の汚染の指標となり得る.
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