空气总悬浮颗粒物γ能谱分析效率刻度
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摘要
采用标准源和模拟软件对空气总悬浮颗粒物样品γ能谱分析的效率刻度进行了研究。参考总悬浮颗粒物采样总量统计情况,取1 g、3 g、5 g、7 g、9 g模拟土壤标准物质制作了5个刻度源,用于分析不同采样量的效率刻度曲线差异。结果显示:无源效率刻度曲线与理论符合较好,效率值随能量降低逐渐增大,低能端可见自吸收造成的差异;两种曲线符合较好,标准源效率刻度曲线在高能端与无源效率刻度曲线基本重合,在低能端离散性稍大,在样品测量中应重点关注压样后的体积回弹造成的影响。
The efficiency calibration of γ-ray spectroscopy analysis of airborne total suspended particulates was conducted using standard source and simulation software. With reference to the statistics of total suspended particulate sampling,take 1 g,3 g,5 g,7 g,and 9 g simulated soil reference materials to make five calibration sources for analyzing the differences in the efficiency calibration curves for different sampling amounts. The results show that the simulation efficiency calibration curve is in good agreement with the theory,the efficiency value gradually increases with the decrease of energy,and the difference caused by self-absorption is seen at the low-energy end; the two curves are in good agreement,and are basically completely coincident at the high-energy end. the dispersion of the standard source efficiency calibration curve at the low energy end is slightly larger. The focus should be on the volume rebound after the sample is pressed In sample measurement.
The efficiency calibration of γ-ray spectroscopy analysis of airborne total suspended particulates was conducted using standard source and simulation software. With reference to the statistics of total suspended particulate sampling,take 1 g,3 g,5 g,7 g,and 9 g simulated soil reference materials to make five calibration sources for analyzing the differences in the efficiency calibration curves for different sampling amounts. The results show that the simulation efficiency calibration curve is in good agreement with the theory,the efficiency value gradually increases with the decrease of energy,and the difference caused by self-absorption is seen at the low-energy end; the two curves are in good agreement,and are basically completely coincident at the high-energy end. the dispersion of the standard source efficiency calibration curve at the low energy end is slightly larger. The focus should be on the volume rebound after the sample is pressed In sample measurement.
引文
[1]荆俊山,傅刚,陈栋.北京市大气悬浮颗粒物TSP和PM10的季节变化特征[J].中国海洋大学学报,2008,38(4):539-541.
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[3]陶俊,陈刚才,钟昌琴.重庆市大气总悬浮颗粒物来源解析[J].中国科学院研究生院学报,2006,23(4):489-493.
[4]刁立军,陈细林,孟军,等.蒙特卡罗方法模拟计算γ能谱分析中的符合相加修正及其实验验证[C].第十三届全国核电子学与核探测技术学术年会论文集(下册),2006:10.
[5]毕存德,吕存兴.γ能谱测量中符合相加修正的实验研究[J].中国辐射卫生,2004,13(2):141-142.
[6]庞巨丰,郑桂芳,张亚伟. Ge(Li)反康普顿探测系统效率的绝对刻度[J].计量学报,1984,5(3):204-210.
[2]王陆军,董卫民.宝鸡市区大气总悬浮颗粒物来源解析[J].西南科技大学学报,2008,23(3):50-52.
[3]陶俊,陈刚才,钟昌琴.重庆市大气总悬浮颗粒物来源解析[J].中国科学院研究生院学报,2006,23(4):489-493.
[4]刁立军,陈细林,孟军,等.蒙特卡罗方法模拟计算γ能谱分析中的符合相加修正及其实验验证[C].第十三届全国核电子学与核探测技术学术年会论文集(下册),2006:10.
[5]毕存德,吕存兴.γ能谱测量中符合相加修正的实验研究[J].中国辐射卫生,2004,13(2):141-142.
[6]庞巨丰,郑桂芳,张亚伟. Ge(Li)反康普顿探测系统效率的绝对刻度[J].计量学报,1984,5(3):204-210.