摘要
在氡子体α能谱法测量中,一个需要考虑的问题是探测器对不同能量的α粒子是否具有相同的探测效率。本文用241Am标准源和加拿大Pylon公司的氡子体标准源对ORTEC八通道α谱仪进行了全谱和高、低能量段探测效率的测定,并对两种测量方法存在的误差进行了分析。测量结果表明,两种方法测得全谱探测效率在误差范围内是一致的;在用氡子体源测量谱仪的探测效率时,α能谱由于滤膜的自吸收而存在着峰重叠现象,经重叠因子修正后,仪器对氡子体较高能量的α粒子(7.69MeV)的探测效率要略大于较低能量的α粒子(6.00MeV),且探测效率的差异随滤膜种类的不同而变化。用氡子体标准源对仪器进行刻度更接近于氡子体测量的实际情况。
For the measurement of radon daughters using alpha spectrometers, it is important to know the difference of detection efficiencies between higher energy α particle and lower one. The detection efficiencies of the ORTEC eight-channel alpha spectrometer working station for higher energy α particle and lower one are measured by an ^241Am alpha standard source and a radon progeny standard source made by Canada Pylon Company, and the difference between the two was analyzed. The results show that the gross spectrum efficiencies of the two sources are equal within the deviations, and after the correction of the peak overlap the detection efficiency of α particle with higher energy is a little higher than that of the one with lower energy. So using radon progeny standard source is better than using ^241Am source, because using radon progeny standard source to calibrate a device is more suitable to the practical radon progeny measurement situation than using ^241Am.
出处
《核技术》
EI
CAS
CSCD
北大核心
2005年第9期700-703,共4页
Nuclear Techniques
基金
国家自然科学基金资助(10075083)
关键词
氡子体
Α粒子
探测效率
α能谱
Radon progeny, α particle, Detection efficiency, α spectrum
