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标题：Measurement of Residual 60Co Activity Induced by Atomic-bomb Neutrons in Nagasaki and Background Contribution by Environmental Neutrons
其他标题：Measurement of Residual 60Co Activity Induced by Atomic-bomb Neutrons in Nagasaki and Background Contribution by Environmental Neutrons
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作者：KIYOSHI SHIZUMA ; SATORU ENDO ; MASAHARU HOSHI 等
期刊名称：Journal of Radiation Research
印刷版ISSN：0449-3060
电子版ISSN：1349-9157
出版年度：2002
卷号：43
期号：4
页码：387-396
DOI：10.1269/jrr.43.387
摘要：Residual 60 Co activity in five steel samples induced by neutrons from the Nagasaki atomic bomb has been measured within about 1000 m from the hypocenter. The chemical separation of cobalt and nickel from steel samples was performed, and cobalt-enriched samples were prepared for all samples. Gamma-ray measurements were carried out with a low-background well-type germanium detector. The gamma-ray spectra for five samples were compared with the spectrum of a control sample to ensure that the observed 60 Co was actually induced by A-bomb neutrons. The activation of cobalt by environmental neutrons was also investigated. It has been shown that the present 60 Co data are consistent with earlier Hashizume's data.
关键词：60Co;Specific activity;Atomic bomb;DS86;Neutrons