k_0-NAA样品测量架位自动调节和半参量化效率计算  

Automatic and Accurate Sample Positioning in k_0-NAA and Semi-parametric Efficiency Normalization for Different Counting Positions

作　　者：肖才锦[1] 倪邦发[1] 田伟之[1] 王平生[1] 刘存兄[1] 张贵英[1] 黄东辉[1] 聂鹏[1] 张海青[1] 陈喆[1] 秦亚丽[1] 

机构地区：[1]中国原子能科学研究院核物理研究所,北京102413

出　　处：《原子能科学技术》2010年第2期232-236,共5页Atomic Energy Science and Technology

摘　　要：设计了中子活化自动换样和架位精密调节系统。实现了任意衰变纲图的γ发射核在源-探测器为0～280mm范围内不同测量位置的效率测定,提出了解决k0法不同测量几何的效率归一以及级联符合校正的半参量化方法。对于源与探测器距离较远的位置(符合效应可忽略),采用有效作用深度进行效率计算;对于源与探测器距离较近的位置(符合效应不能忽略),采用实验测得不同位置的效率比进行计算。An automatic sample changer and an accurate sample positioning system were developed for y-spectrum measurements in general and k0-NAA in particular. Full energy peak efficiencies for radionuclides with arbitrary decay schemes were calibrated over 0-280 mm source-detector distances. A semi-parametric method was established for efficiency normalizations among different counting positions-parametric effective interac- tive depth method for efficiency normalizations of ＂far＂ （true coincidence effect negli- gible） counting positions, and experimentally determined ＂rack-ratio＂ of a given γ-ray from a given nuclide for that of ＂near＂ （true coincidence effect worth considering） counting positions.

关 键 词：k0--NAA 级联符合 有效作用深度 高纯锗探测器 

分 类 号：O657[理学—分析化学]