A measurement system for alpha and beta surface emission rate using MWPC  

作　　者：林业 方方 任家富 何林峰 唐方东 徐一鹏 丁卫撑 

机构地区：[1]Provincial Key Laboratory of Applied Nuclear Techniques in Geosciences, Chengdu University of Technology [2]Laboratory of Ionizing Radiation, Shanghai Institute of Measurement and Testing Technology

出　　处：《Chinese Physics C》2015年第5期60-63,共4页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(41204133)

摘　　要：We have developed a large area multi-wire proportional counter （MWPC） as a standard for the measurement of alpha and beta surface emission rate at the Shanghai Institute of Measurement and Testing Technology （SIMT）. To shorten the preparation time for chamber gas refilling, a self-designed gas control unit was adopted. Various characteristics of the system have been studied. The uncertainties were analysed. Three certified alpha plane sources （Am-241） and six certified beta plane sources （T1-204 and Sr-90/Y-90） were measured by this system, The results show excellent agreement with the surface emission rate reported by the National Institute of Measuring, China （NIM） that En values of all measured sources are within ±1.We have developed a large area multi-wire proportional counter （MWPC） as a standard for the measurement of alpha and beta surface emission rate at the Shanghai Institute of Measurement and Testing Technology （SIMT）. To shorten the preparation time for chamber gas refilling, a self-designed gas control unit was adopted. Various characteristics of the system have been studied. The uncertainties were analysed. Three certified alpha plane sources （Am-241） and six certified beta plane sources （T1-204 and Sr-90/Y-90） were measured by this system, The results show excellent agreement with the surface emission rate reported by the National Institute of Measuring, China （NIM） that En values of all measured sources are within ±1.

关 键 词：alpha/beta counting surface emission rate plateau curve MWPC 

分 类 号：O571[理学—粒子物理与原子核物理]