摘要
ZnS(Ag)涂层厚度会影响222 Rn/220 Rn绝对测量小闪烁室的探测效率.用241 Amα电镀参考源对厚度为10 mg/cm2的ZnS(Ag)涂层α探测效率进行了实验验证.分别采用解析方法与MCNP模拟方法计算了相对立体角修正因子,讨论了空气层对α粒子的吸收修正,分析了不确定度来源.实验结果表明,10 mg/cm2 ZnS(Ag)涂层对α粒子的探测效率在102.4%~103.1%之间,不确定度小于5.44%.在实验不确定度范围内,可认为其对α粒子的探测效率为100%.实验证明了222Rn/220Rn绝对测量小闪烁室内采用10 mg/cm2厚的ZnS(Ag)涂层是可行的.
The detection efficiency of one small scintillation cell for 222RI1//22~RR absolute measurement can be affected by ZnS (Ag) coating layer thickness on the inner wall of the small scintillation cell. The a detection efficiency of 10 mg,/cm2 thickness ZnS (Ag) coating layer has been tested and verified using a plating reference source (241Am). The solid angle correction factor is calculated by analysis and MCNP simulation methods. The absorption cor- rection of air layer on α particle has been discussed. The source of uncertainty has been ana- lysed. The results indicate the a detection efficiency of 10 mg/cm2 thickness ZnS (Ag) coat- ing layer is between 102.4% - 103.1% while the uncertainty is less than 5.44%. In the un- certain range ct detection efficiency of it is considered as 100%. 10 mg,/cm2 thickness ZnS (Ag) coating layer can be used to apply on the inner wall of the small scintillation cell for222Rn/22~Rn absolute measurement.
出处
《南华大学学报(自然科学版)》
2012年第1期19-23,共5页
Journal of University of South China:Science and Technology
基金
2009年湖南省教育厅研究生科研创新基金资助项目(2009CXJJ4)