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-ray emitters including 
Cs, 2; Study of the coincidence summing effect taking into account for the thickness of the cylindrical shaped volume sampleYamada, Takashi*; Abe, Takaaki*; Asai, Masato; Yonezawa, Chushiro*; Kakita, Kazutoshi*; Hirai, Shoji*
no journal, ,
The true coincidence summing corrections for cascade rays are usually carried out by using -ray detection efficiencies averaged over whole sample volume. This is not an exact method, but is recognized to be practically useful. However, a recent international comparison experiment suggested that this method provides slightly small correction factors. To solve this problem, we developed a method to calculate the true coincidence summing corrections for cylindrical shaped volume samples by dividing the volume sample into a number of plane samples, calculating the efficiencies for each plane sample with summing corrections, and integrating them over whole sample volume. This method improved the problem of small correction factors.
Hirade, Tetsuya
no journal, ,
Positronium (Ps) can be formed by injecting positrons in water. Ps will create a bubble because of its negative work function and localize in it. Reactions between triplet Ps and OH radicals are investigated by positron annihilation age-momentum correlation (AMOC) measurement. Some of the reactions occur with the pairs having spin correlated unpaired electrons and show quantum beats. This experimental result indicates that OH radicals, probably, locate on the surface of water clusters and that there are not so many cations and excess electrons near thermalized positron at the end part of the positron track, i.e. terminal spur of injected positron.
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.
-ray emitters including Cs, 1; Collaborative experiment by the committee on preparation of reference materials for radioactivity analysis of JSACYonezawa, Chushiro*; Kakita, Kazutoshi*; Takahashi, Takanori*; Aono, Tatsuo*; Maeda, Satoshi; Abe, Takaaki*; Arakawa, Fumihiro*; Kiho, Nobuharu*; Akiyama, Masakazu*; Muramatsu, Isamu*; et al.
no journal, ,
no abstracts in English
Honda, Fumiya*; Kinase, Sakae
no journal, ,
no abstracts in English
Kai, Tetsuya; Matsumoto, Yoshihiro*; Hiroi, Kosuke; Su, Y. H.; Segawa, Mariko; Parker, J. D.*; Shinohara, Takenao; Hayashida, Hirotoshi*; Oikawa, Kenichi; Nakatani, Takeshi; et al.
no journal, ,
no abstracts in English