Pu isotopes, 241Am and 137Cs in soils from the atomic bombed areas in Nagasaki and Hiroshima.
Pu isotopes, 241Am and 137Cs in soils from the atomic bombed areas in Nagasaki and Hiroshima.
复制标题
长崎和广岛原子弹爆炸地区土壤中的 Pu 同位素、241Am 和 137Cs。
DOI：
10.1269/jrr.26.211
复制
发表时间：
1985
影响因子：
2
通讯作者：
Shunzo Okajima
中科院分区：
文献类型：
--
作者：
Masayoshi Yamamoto;K. Komura;M. Sakanoue;Masaharu Hoshi;Shozo Sawada;Shunzo Okajima
本文测定了长崎和广岛土壤样品中的钚同位素、~（241）Am和~（137）Cs，以评价1945年原子弹爆炸残留放射性的贡献。在长崎西山地区的土壤中，发现了与全球沉降物不同的238 Pu/239，240 Pu的活度比（0.05-0.06），239，240钚/137铯（0.2-0.3），241 Am/239，240 Pu（0.04-0.05）和240 Pu/239 Pu（0.08-0.13）的放射性比值表明，该地区积累了相当数量的原子弹产生的钚。另一方面，在广岛“黑雨”地区的土壤中，除了在距震中NNW方向10 km和12 km处收集的土壤中观察到2至3倍的低241 Am/239，240 Pu活度比外，未发现Pu同位素、241 Am和137 Cs之间的活度比与全球沉降物有显著差异。然而，通过测量240 Pu/239 Pu同位素比值，没有发现原子弹贡献的证据。
Plutonium Isotopes, 241Am and 137Cs in soil samples collected from Nagasaki and Hiroshima were measured to evaluate the contribution of residual radioactivity derived from the atomic bombs dropped in 1945. In the soils from Nishiyama area of Nagasaki City, activity ratios different from those of global fallout were found for the 238Pu/239, 240Pu (0.05-0.06), 239, 240Pu/137Cs (0.2-0.3), 241Am/239, 240Pu (0.04-0.05) and 240Pu/239Pu (0.08-0.13), activity ratios indicating that a fair amount of plutonium derived from the atomic bomb had accumulated in this area. On the other hand, in the soils from the “Black-rain” area of Hiroshima, no significant difference from the global fallout was found for the activity ratios among the Pu isotopes, 241Am and 137Cs except for the soils collected at 10 km and 12 km in the NNW direction from the epicenter, where a factor 2 to 3 lower 241Am/239, 240Pu activity ratio was observed. However, no evidence of the contribution of the atomic bomb was found by the measurement of 240Pu/239Pu isotopic ratio.