2006 年 32 巻 3 号 p. 156-166
The fast neutron fluence of the Hiroshima atomic bomb was estimated by measuring radioactive nuclides produced by the fast neutron reaction in various materials. The early measurements were carried out for 32P. The new data obtained for 63Ni produced by the 63Cu(n, p)63Ni reaction were shown. The data for 63Ni were obtained by both the accelerator mass spectrometry and the low background beta-ray measurement. The data for the fast neutron fluence are consistent with the values calculated by a new Dosimetry System 2002(DS02).