Measurement of Residual 60Co Activity Induced by Atomic-bomb Neutrons in Nagasaki and Background Contribution by Environmental Neutrons | Zendy

Kiyoshi Shizuma | Zendy; Satoru Endo | Zendy; Masaharu Hoshi | Zendy; Jun Takada | Zendy; K. Iwatani | Zendy; H. Hasai | Zendy; Oka T | Zendy; Tatsuya Shimazaki | Zendy; Yutaka Okumura | Zendy; Shoichiro Fujita | Zendy; Tadaaki Watanabe | Zendy; Tetsuji Imanaka | Zendy

Open Access

Measurement of Residual 60Co Activity Induced by Atomic-bomb Neutrons in Nagasaki and Background Contribution by Environmental Neutrons

Author(s) -

Kiyoshi Shizuma,

Satoru Endo,

Masaharu Hoshi,

Jun Takada,

K. Iwatani,

H. Hasai,

Oka T,

Tatsuya Shimazaki,

Yutaka Okumura,

Shoichiro Fujita,

Tadaaki Watanabe,

Tetsuji Imanaka

Publication year - 2002

Publication title -

journal of radiation research

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.643

H-Index - 60

eISSN - 1349-9157

pISSN - 0449-3060

DOI - 10.1269/jrr.43.387

Subject(s) - neutron , radiochemistry , hypocenter , cobalt , materials science , gamma ray , nuclear physics , chemistry , physics , metallurgy , geology , seismology , induced seismicity

Residual 60Co 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 60Co was actually induced by A-bomb neutrons. The activation of cobalt by environmental neutrons was also investigated. It has been shown that the present 60Co data are consistent with earlier Hashizume's data.

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