2014 Fiscal Year Final Research Report
Understanding the distribution and migration process of Fukushima-derived plutonium isotopes in the environment.
| Project/Area Number |
24310002
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Hirosaki University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
TAZOE Hirofumi 弘前大学, 被ばく医療総合研究所, 助教 (60447381)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | 環境計測 / 環境放射線（能） / 福島原発事故 / プルトニウム / 防護 |
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| Outline of Final Research Achievements |
The activity ratio of 238Pu/239+240Pu is characteristic for the Pu emission source, information on the Pu isotopic signature is very useful to identify the sources of Pu in the environment. The objectives of this study were to measure the 238Pu/239+240Pu activity ratio in surface soil samples and to estimate the relative contribution of the global fallout Pu and the Fukushima-derived Pu.
The 238Pu/239+240Pu ratios in surface soil samples ranged from 0.03 to 1.27. Higher 238Pu/239+240Pu ratios than the value of 0.03 from the global stratospheric fallout were found. Higher ratios may prove the existence of Pu from the Fukushima Dai-ichi Nuclear Power Plant accident. The contribution of Pu from the Fukushima Dai-ichi Nuclear Power Plant accident can be estimated as a mixture of Pu from the global stratospheric fallout and Fukushima Dai-ichi Nuclear Power Plant. The relative percentage of Pu from the Fukushima accident was 42 % in soil sample of 238Pu/239+240Pu ratio of 1.27.
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| Free Research Field |
同位体環境化学
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