【摘要】 利用HPGe探测器能谱仪对已经建立的低空气比释动能率和窄谱两个系列的过滤X射线参考辐射进行了实验测定,通过蒙卡模拟方法建立了探测系统的模型,模拟计算能量6 keV～305 keV间隔1 keV的响应矩阵,利用反卷能谱法得到参考辐射场的注量谱,进而计算了各参考辐射的平均能量、能量分辨率、半值层、同质系数、从空气比释动能到周围剂量当量和个人剂量当量的转换系数,并与GB/T 12162中给出的参考谱和各特征值的推荐值进行了比较,两者符合较好,验证了已建立的X射线参考辐射的准确性和可靠性。更多还原

【Abstract】 A HPGe spectrometer was used to measure the established filtered X ray reference radiation of low kerma series and narrow spectrum series.A monte carlo model of measurement system was developed with the response matrix for 6 keV—305 keV simulated by energy interval of 1 keV and the fluence spectra was calculated by unfolding method.To verify the measuring and unfolding method,the mean energy,the first and second half-value layers and the energy resolution of the spectra were calculated from the fluence spectra and compared with the values given in GB/T 12162,the deviation was about less than 5%.The conversion coefficients from the air kerma to the ICRU operational quantities Hp(10),Hp(0.07),and H*(10) were calculated using monoenergetic conversion coefficients at zero angle of incidence,which agreed well with the values given in GB/T 12162.更多还原