电子加速器X射线源能谱整形理论与模拟研究

Energy Shaping Theory and Simulation for Electron Linac X-ray Source

利用能谱整形技术产生的X射线优化能谱可减小伪影误差,提高无损检测材料识别精度。如何利用能谱整形技术产生指定的优化能谱是要解决的关键问题。为解决这一问题,对能谱整形基本理论进行了研究,设定了能谱整形的目标,利用蒙特卡罗方法模拟计算出电子加速器出射X射线能谱,对能谱和整形材料的线性衰减系数进行拟合,计算了能谱整形所需要的相关参数并确定能谱整形方法,运用蒙特卡罗方法模拟验证了所采用的能谱整形方法的合理性。

Energy shaping technology could be used to reduce artifact error and increase nondestructive testing accuracy. How to produce required spectrum is a key issue. This article proposes spectrums whose peak energy are 3 MeV, 6 MeV and 12 MeV especially as required spectrum and discusses calculation method for energy shaping. In order to calculate related parameters, this article simulates X-ray spectrum produced by electron Linac with Monte-Carlo method, makes equation fitting for the X-ray spectrum and linear attenuation coefficients of shaping materials, decides final arrangement for shaping according to calculation results and verifies the arrangement with Monte-Carlo method.