几何条件对反康普顿γ谱仪测量影响研究  

Study on Influence of Geometric Conditions on Measurement of Anti-Compton γ Spectrometer

作　　者：任琦颀 於国兵 顾先宝 杜勤 何旭 陈志[1] REN Qi-qi;YU Guo-bing;GU Xian-bao;DU Qin;HE Xu;CHEN Zhi(University of Science and Technology of China,Hefei 230026»China;Anhui Environmental Radiation Supervision Station,Hefei 230022,China)

机构地区：[1]中国科学技术大学,合肥230026 [2]安徽省辐射环境监督站,合肥230022

出　　处：《核电子学与探测技术》2020年第3期396-399,共4页Nuclear Electronics & Detection Technology

基　　金：生态环境部辐射环境检测领域重、难点监测方法验证项目JC201937。

摘　　要：为研究实际样品所处几何位置与样品的几何形状对反康普顿γ谱仪的测量影响,通过改变源与探测器的位置和源自身的几何形状来测试一套反康普顿γ谱仪系统的康普顿抑制效果。主探测器与塞探测器贴近源时,峰康比(P/C)与康普顿抑制系数(CSF)可达最大值;相同直径的体源,高度越小,其P/C与CSF越小;相同高度的体源,直径越小,其P/C与CSF越小。在测试的40K体源系列中,φ30 mm×15 mm的体源具有最大的P/C和CSF值。改变样品的测量位置,优化样品的几何形状,能够在一定程度上获得更好的康普顿抑制效果。To study the influence of the geometric position of the actual sample and the geometry of the sample on the measurement of the anti-Campton gamma spectrom eter,the Compton suppression effect of an anti-Campton y spectrometer system was tested by changing the position between the source and primary detector or plug detector and the geometry of the source itself.When the source is located at the surface of the primary detector and the plug detector is close to the point source,the peak-to-Compton ratio(P/C)and Compton-suppressed factor(CSF)can reach the m axim um;The P/C and CSF are smaller when the volume source have the same diameter and smaller height or when the volume source have the same height and smaller diameter.Among the40K volume source which was tested,the volume source of Ф30mm ×5mm has the largest P/C and CSF value;the volume source of 075 mm×20 mm has comparatively large P/C and CSF value,and can load more sample.The Compton-suppressed effect can be better by changing the geometric position and geometry of the actual sample.

关 键 词：反康普顿HPGEΓ谱仪 峰康比 康普顿抑制系数 40K 137Cs 

分 类 号：TL812.1[核科学技术—核技术及应用]