摘要目的 对医疗诊断X射线(RQR辐射质)主射线束进行模拟和能谱测量,验证模拟方法的可行性和能谱模拟结果的可靠性.方法 使用蒙特卡罗模拟程序BEAMnrc,建立了产生医用诊断X射线RQR系列辐射质的简化模型,实验上采用平面高纯锗谱仪对上述辐射质的能谱进行了测量,并与模拟结果进行比较.结果 谱仪测得的脉冲高度谱在未经卷积处理的情况下,两者平均能量的差异＜3％;此外,通过BEAMDP程序还得到了RQR系列辐射质的能谱分布、注量、能注量、平均能量等参数.结论 可通过BEAMnrc模拟计算得到的RQR辐射质能谱,为评估诊断X射线RQR辐射质提供依据.

abstractsObjective To validate the feasibility of the simulationmethod and the reliability of thesimulationresult through comparison between simulation and measurement of the energy spectrum from medical diagnostic X-ray (RQR-Radiation qualities in radiation beans emerging from the X-ray source assembly).Methods A simplified model of the medical diagnostic X-ray RQR radiation quality was established using code of BEAMnrc.The energy spectrum of the same RQR radiation quality were measured through a plane high-purity germanium spectrometer,and compared with the simulationresult.Results The difference of spectral distribution between measurement and simulation was less than 3％,in spite of the convolution processing not happened to the pulse height distribution measured by the spectrometer.And the spectral distribution,fluence,energy fluence,means energy distribution of the radiation was obtained using the code of BEAMDP.Conclusions As indicated above,it is possible to use the simulation of the energy distribution as a foundation for the establishment of X-ray RQR radiation quality.