Determination of ⁶⁰Co Activity in Steel Samples in Hiroshima

A Review of Forty-Five Years Study of Hiroshima and Nagasaki Atomic Bomb Survivors I. DOSIMETRY

Abstract

Specific activity of ⁶⁰C in two steel samples taken at 687m S and 1295m NNW from the hypocenter was measured by gamma-ray spectrometry and neutron activation analysis¹⁾. The results are consistent with previous data by Hashizume et al. for steel rings on the surface of roofs of buildings. Content of nickel and copper in the samples was found to be too small to account for any significant ⁶⁰Co production by fast neutron reactions.