【摘要】 为测量环境γ辐射周围剂量当量，对Ｇ－Ｍ计数管的自身本底和能量响应特性进行了实验研究。采用铅、锡两种金属材料做为过滤器改变计数管的能量响应，为拓宽仪表量程采用两种尺寸计数管。两种计数管在６０ｋｅＶ至６６２ｋｅＶ范围内，Ｈ＊（１０）／Ｘ随能量变化与ＩＣＲＵ４７号报告结果最大偏离分别为－２３％和＋２４％，仪表量程为１０ｎＳｖ·ｈ－１～１０ｍＳｖ·ｈ－１，探测下限可达到４０ｎＳｖ·ｈ－１。更多还原

【Abstract】 For measuring H *(10) from environmental γ radiation, the background and energy response of G M counter was studied. The energy response can be improved by a filter consisted of Sn and Pb. In order to extend the measuring range, we used two counters with different size. For two improved G M counters, the maximum deviations of H *(10) varing as energy of γ radiation from the results given by ICRU 47 are -23% and +24%, respectively between 60 keV and 662 keV. The instrument range is 10 nSv·h -1 ～10 mSv·h -1 , and the lower limit of detection is in the order of 40 nSv·h -1 . (更多还原