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Yamazaki, Hideo*; Ishizu, Naoto*; Kokubu, Yoko
no journal, ,
Our country has experienced radioactive pollution of many times, such as atomic bombs of Hiroshima and Nagasaki, global fallout from nuclear weapon tests and the accident of Chernobyl until now. The radioactive pollution has been released even in now from the Fukushima Nuclear Power Plant, which was damaged by the Eastern Japan earthquake disaster. We report the historical trend of radioactive pollution in our country and the actual condition of present incident. We analyzed soils and sediment cores collected in Nagasaki and determined the spatiotemporal distribution of the radionuclide released from the Nagasaki atomic bomb. Some surface soils in Fukushima City (55km from nuclear power plant) was measured by 
-ray spectrumetry and some radionuclides such as 
I and 
Cs were detected.
ray analysis softwares using reference spectraAoyama, Michio*; Akiyama, Masakazu*; Asai, Masato; Abe, Takaaki*; Sato, Yasushi*; Takano, Naoto*; Takamiya, Koichi*; Hamajima, Yasunori*; Muto, Giichi*; Yamada, Takashi*; et al.
no journal, ,
Performance of -ray spectrum analysis softwares is significantly important because it directly affects the results of nuclide identification and radioactivity measurement. The Expert Committee on Next-generation Gamma-ray Spectrometry, Science and Engineering Committee, Japan Radioisotope Association, performed intercomparison of -ray analysis software by analyzing the same reference spectra with several softwares used in Japan, to know and to improve their performance. It was found that the number of peaks detected by the peak search analysis and deduced peak areas were different among each of the softwares. The reasons why such differences occur are investigated in detail.