摘要
研究了低能X射线光管出射的初始能谱形状。在理论分析的基础上，采用蒙特卡罗程序EGSnrc模拟了低能x射线光管中的焦点大小，阳极靶的材料、厚度、角度、面积，这五个参数分别对低能X射线能谱的影响。结果表明：焦点对能谱的影响随着入射粒子能量的增加稳定在1％以内；靶材料的原子序数越高，谱线的强度越大；随着阳极靶角的增大，谱线的平均能量会有所降低；靶厚大于电子射程时，其对能谱的影响可以忽略；靶面积过大会引起光子损失。
The initial energy spectrum of X-rays tube was studied. On the basis of the theoretical analysis, Monte-carlo simulation program （EGSnrc） is adopted to simulate the low-X rays energy spectrum, which is affected by the focus size of X-ray, anode materials, angle, thickness and radius of the target. The results show that the influence of focus size on energy spectrum will be stabilized within 1% along with the increase of energy ; the atomic number of target material is higher, the greater the strength of the sPectral lines; the average energy of spectrum will be reduced along with the increase of anode target angle. When target thick is greater than electronic range the influence of target thick can be ignored and the larger target area will cause the photon loss.
出处
《计量学报》
CSCD
北大核心
2011年第B12期51-53,共3页
Acta Metrologica Sinica
