P/T法及び標準線源法に基づいた体積試料中放射能のサム効果補正量の検討

Coincidence summing correction factors based on P/T method and reference source method for volume samples

三枝 純; 永山 雄大; 前田 智史; 岡崎 勤; 依田 朋之; 武石 稔 

Saegusa, Jun; Nagayama, Takehiro; Maeda, Satoshi; Okazaki, Tsutomu; Yoda, Tomoyuki; Takeishi, Minoru

線スペクトロメトリ法により放射能を定量する際、サム効果を補正する必要がある。各種形状・材質の体積試料についてピーク・トータル費(P/T)法によりCsの605keV及び796keV線のサム効果の補正量を評価した。この結果をCsを含む標準体積源の実測から得た値と比較し考察した。

In the process of -ray spectrometry analyses for radioactivity measurements, the coincidence summing effect needs to be considered. In this study, the concidence summing correction factors for 605 and 796 keV -rays from various standard volume sources were evaluated based on the peak-to-total (P/T) ratio method. The results were compared with the values directly obtained from the measurements of these sources containing certified amount of Cs nuclide.