摘要
从核素衰变纲图出发,导出了γ射线级联符合修正系数的计算公式;考虑了γ射线与X射线以及与正电子湮没光子的级联修正问题。采用多线法和距离变换相结合的方法,刻度了高纯锗探测器在不同源距下的全能峰效率曲线,在60-1116 keV能区范围内,绝对峰效率误差小于2.5％.对单能源确定出其峰总比,在此基础上计算了^(152)Eu、^(60)Co、^(22)Na的级联符合修正系数.
Based on the decay scheme, the formulas for calculating the correction factors of theγ-ray coincidence summing effects are deduced. The corrections for the coincidence of γ- rays with X-rays (from electron capture or internal conversition) and with annihilation quanta from positron decay are also discussed. The fullenergy -peak efficiency of the HPGe detector at defferent source - to - detector distance is calibrated by using the multi -γ- ray sources calibration method combined with the distance variation method with several single - γ- ray sources. The error of the efficiency is less than 3% at the energy range of 60 - 1116 keV. The peak -to -total ratio is determined for the single -γ-ray sources. The coincidence summing correction factors for Eu, Co and Na are calculated.
出处
《核技术》
CAS
CSCD
北大核心
1992年第7期428-435,共8页
Nuclear Techniques
关键词
级联符合效应
锗
探测器
Γ射线
Coincidence summing effect HPGe detector Efficiency calibration Peak - to - total ratio
