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Feasibility of using ~(236)U to reconstruct close-in fallout deposition from the Hiroshima atomic bomb

机译:使用〜(236)U重建广岛原子弹近距离辐射沉积的可行性

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摘要

The first results on the feasibility of using ~(236)U to reconstruct the level and spatial distribution of close-in fallout deposition from the Hiroshima A-bomb are reported, coupled with the use of global fallout ~(137)Cs and 239 + 240_(pu) The results for golbal fallout ~(236)U in soil samples (0-30 cm) from Ishikawa prefecture showed that the deposition density of ~(236)U from the global fallout can be accurately evaluated using AMS. All deposited ~(236)U, ~(137)Cs and ~(239 + 240)pu appeared to have been recovered using 30-cm cores. It was also noted from the depth profiles for ~(236)U/~(239) + ~(240)Pu and ~(236)U/~(137)Cs ratios that the downward behavior of ~(236)U in the soil was apparently similar to that of ~(239)+ 240)Pu, while the~(137)Cs was liable to be retained in upper layers compared with ~(236)U and ~(239 + 240)Pu. The accumulated levels were 1.78 ×10~(13)atoms m~(-2) for ~(236)U, 4340 Bqm~(-2) for ~(137)Cs and 141 Bq m~(-2) for ~(239 + 240)Pu. The ratios of ~(236)U/~(137)Cs and ~(236)U/~(239 +240)Pu were (4.10±0.12)×l0~9 and (1.26±0.04)×10~(11)atoms Bq~(-1), respectively. Results of~(236)U, ~(137)Cs and ~(239+240)pu measurements for the seven soil cores (0-30 cm) from Hiroshima were discussed on the basis of ratios of ~(236)U/~(137)Cs and ~(236)U/~(239+240)Pu by comparing with those from the background area in Ishikawa, indicating that the global fallout dominates the current level of ~(236)U accumulation in soil in the Black-rain area around Hiroshima after the Hiroshima bomb, and the contribution of the close-in fallout ~(236)U produced by the Hiroshima A-bomb seems difficult to observe.
机译:报道了使用〜(236)U重建广岛原子弹近距离沉降沉积物的水平和空间分布的可行性的第一个结果,以及使用整体沉降(〜137)Cs和239 + 240_(pu)石川县土壤样品(0-30 cm)中的球形沉降〜(236)U的结果表明,可以使用AMS准确评估全球沉降~~ 236U的沉积密度。所有沉积的〜(236)U,〜(137)Cs和〜(239 + 240)pu似乎都已使用30-cm岩心回收。从〜(236)U /〜(239)+〜(240)Pu和〜(236)U /〜(137)Cs比的深度剖面还注意到,〜(236)U在土壤与〜(239)+ 240)Pu明显相似,而〜(137)Cs与〜(236)U和〜(239 + 240)Pu相比易于保留在上层。 〜(236)U的累积能级为1.78×10〜(13)个原子m〜(-2),〜(137)Cs的累积能级为4340 Bqm〜(-2),〜(( 239 + 240)Pu。 〜(236)U /〜(137)Cs与〜(236)U /〜(239 +240)Pu之比为(4.10±0.12)×l0〜9和(1.26±0.04)×10〜(11)原子Bq〜(-1)根据〜(236)U /〜的比值,讨论了广岛的七个土壤核(0-30 cm)的〜(236)U,〜(137)Cs和〜(239 + 240)pu测量结果。 (137)Cs和〜(236)U /〜(239 + 240)Pu与石川本底地区的相比,表明全球沉降量主导着黑土中当前〜(236)U在土壤中的积累水平广岛炸弹爆炸后广岛周围的雨水区域,以及广岛原子弹产生的近距离辐射〜(236)U的贡献似乎很难观察到。

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  • 来源
    《Science of the total environment》 |2010年第22期|p.5392-5398|共7页
  • 作者单位

    Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan;

    Low Level Radioactivity Laboratory, K-INET, Kanazawa University, Nomi, Ishikawa 923-1224, Japan;

    VERA-Laboratory, Fakultaet fuer Physik - Isotopenforschung, Universitaet Wien, Wahringer Str. 17, 1090 Vienna, Austria;

    Research Reactor Institute, Kyoto University, Kumatori-cho, Osaka 590-0494, Japan;

    Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan;

    Quantum Energy Applications, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan;

    Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan;

    Low Level Radioactivity Laboratory, K-INET, Kanazawa University, Nomi, Ishikawa 923-1224, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    hiroshima atomic bomb; global fallout; uranium; AMS; radionuclide; soil; black-rain;

    机译:广岛原子弹全球影响;铀;AMS;放射性核素泥;黑雨;
  • 入库时间 2022-08-17 13:56:25

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