G－M计数管剂量率仪用于环境辐射水平测量时的一些问题  

Problems for Measurements of EnvironmentaI Gamma Radiation Using G-M Counter Dose Rate Monitors

作　　者：刘伯学 毛用泽 马文帮 张俊生 李湘葆 叶志跃 

出　　处：《核电子学与探测技术》1995年第2期109-113,共5页Nuclear Electronics & Detection Technology

摘　　要：本文针对Ｇ－Ｍ计数管剂量率仪器用于测量环境辐射水平，讨论了其能量响应的改进方法、自身本底的影响以及在典型Ｙ辐射场中能量响应所造成的极端误差。Ｇ－Ｍ计数管经过包适当的能量响应补偿层，单能能响可以达到好于±３０％．在典型Ｙ辐射场中能量响应所造成的极端误差不超过士１５％。经过扣除自身本底，测量下限可以达到ＩＯ￣（－８）Ｇｙ／ｈ的量级，兼顾一般环境辐射水平的测量。For measurements of environmental gamma-ray dose rate byusing G-M counter dose rate monitors ,thepaper diseusses the methods ofenergy response improvements relative to H_(10). The energyrespones of energy-compensated G-M tubes will be better than± 30%inmonoenergy field(include the narrow spectrum and lowair kerma rate Xradiation field of ISO 4037).Meanwhile,in some special garmma radiationfield,the maxium er-rors will be less than± 15%.The effects of internal radioactiVlty background of G-Mcounter on the lower lim-it of gamma dose rate measuring assembly are also discussed.If theinternal background could be substractedcarefully ,the lower limit ofdetection will be down to level of 10￣(-8)Gy/h,so the instruments can beused to mea-sure the environmental gamma-ray dose rate.(

关 键 词：G-M计数管 天然环境辐射 剂量率监测 

分 类 号：TL811.3[核科学技术—核技术及应用]