【摘要】 便携式γ谱仪是测量环境γ辐射的有效设备,除了用于定性或定量分析放射性核素外,也可以用于空气γ吸收剂量率测量。如果要求精确测量,需要使用能谱剂量转换函数,即G(E)函数进行能谱处理。首先使用6种标准点源刻度了一台HPGeγ谱仪对各种能量γ射线的能谱响应,然后使用最小二乘法计算了其G(E)函数,并分析了G(E)函数的特点。最后,根据电离室的空气γ吸收剂量率测量结果检验了计算结果的正确性。更多还原

【Abstract】 Portable γ spectrometer is useful instrument for use in environmental γ radiation measurement.Besides qualitative and quantitative analysis of radionuclides,environmental γ dose rate can also be measured.Ifγ dose rate need to be accurately measured,spectrum to dose conversion function(G(E) function) must be used to analyze the spectrum.Response of the HPGe γ spectrometer to various γ rays was measured by six standard point sources,then G(E) function was calculated by least square fitting method,and its characteristic was analyzed.Finally,the calculation results were verified by the results measured by ionizing chamber.更多还原