微少量環境試料測定用井戸型 Ge 検出器の効率特性
微少量環境試料測定用井戸型 Ge 検出器の効率特性
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井式Ge探测器测量少量环境样品的效率特性
DOI：
10.3769/radioisotopes.42.169
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
金井 豊
中科院分区：
文献类型：
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作者：
金井 豊
研制了一种用于测定少量环境样品中U和Th系列核素放射性活度的阱型Ge探测器。阱型探测器的峰值效率随样品高度的增加而降低（相对变化率（a ′/Eff（24 mm））约为-1%/ mm）。主要原因被认为是自我专注。当取样高度小于井深时，用一阶回归公式计算效率比较方便。将该技术应用于湖芯沉积速率的测定，取得了较好的效果。
A well-type Ge detector was studied to use for determining radioactivities of U and T h-series nuclides in small amount of environmental samples. Peak efficiencies of the well-type detector decreased against the height of sample (relative variation rate (a'/Eff (at24mm) ) was about -1%/ mm in this study) . The principal reason is thought to be in self-absorption. It is convenient to use the first-order regression formula to calculate the efficiencies if sample height is lower than the well depth. This technique was applied to lake core samples to determine sedimentation rate, and a good result was obtained.