| Project/Area Number |
22404004
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Risk sciences of radiation/Chemicals
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| Research Institution | Kanazawa University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
坂口 綾 広島大学, 理学(系)研究科(研究院), 助教 (00526254)
星 正治 広島大学, 原爆放射線医科学研究所, 名誉教授 (50099090)
今中 哲二 京都大学, 原子炉実験所, 助教 (90109083)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2012: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2011: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2010: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
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| Keywords | 旧ソ連 / セミパラチンスク核実験場 / 被曝線量評価 / 土壌 / 残留放射能 / カイナル集落 / 放射性降下物 / セシウム-137 / プルトニウム / 外部被曝線量 / 被曝線量評価モデル / 旧ソ連核実験場 / セミパラチンスク / 外部被曝線量評価 / 内部被曝線量評価 / 低線量率長期被曝 |
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| Research Abstract |
Since 1994, we have concentrated our energies on assessing the radiation dose for human effect and environmental contamination by the nuclear testings at the Semipalatinsk (SNTS) in Kazakhstan. For this purpose, residual long-lived radionuclides such as 137Cs and Pu isotopes have been measured for environmental samples from various areas. At first, works were focused on Dolon village contaminated heavily and external radiation dose for resident was already estimated by detailed soil samplings where were carried out along a line perpendicular to the supposed center of plume of the first atomic bomb (Aug. 1949). In this works, such works were directed to Sarzhal, Karaul and Kainar villages located in the southern direction from the SNTS. Although the obtained data in Sarzhal and Karaul varied largely, overall, peak-like distributions similar to Gaussian function were observed for both 137Cs and 239,240Pu even after about 60 years from atomic bomb. Within the Sarzhal village, being about 5 km away from the center-axis, upper range is 5000-7000 Bq/m^2. Pu is around 2000 Bq/m^2. By using these data, external radiation doses in both villages were successfully estimated. On the other hand, in Kainar, Gaussian-likedistribution was not observed,137Cs inventory was not so high, now its inventory was around 4000 Bq/m^2. The levels are nearly same as Karaul, but somewhat higher sites like hot-spot were in places existing. Now, further works in Kainar are continuing.
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