Abstract
天然核種40Kを含むズイキの葉柄部の皮をはぎ，乾燥，粉末化して，圧縮成形法を適用した。でき上がったディスク状ズイキ線源10個の重量，直径，厚さ，1分間計数（GMサーベイメータで主に40K由来のβ線を測定）の平均値（標準偏差）は15.1(0.03) g, 9.98(0.1) mm, 35.2(0.01) mm, 163.4(10.5) cpmであった。また測定試験により，ズイキ線源は放射線防護の3原則と，放射線計数の統計的変動に関する測定実習に使用できることがわかった。
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