用多个能量探测方法校正层析γ扫描透射图像重建中射线线衰减系数  

THE METHOD OF MULTI-ENERGY GAMMA RAYS TO RECTIFY LINEAR ATTENUATION COEFFICIENT IN IMAGE RECONSTRUCTION OF TOMOGRAPHIC GAMMA RAY SCANNING

作　　者：翁文庆[1] 王德忠[1] 张勇 刘诚[1] 杨永亮 

机构地区：[1]上海交通大学,上海200240 [2]秦山核电有限公司,浙江海盐314300

出　　处：《辐射防护》2008年第1期24-28,共5页Radiation Protection

基　　金：国家自然科学基金资助项目(项目编号:10675084)

摘　　要：对采用多个能量探测方法来校正层析γ扫描透射图像重建中射线线衰减系数进行了初步探讨。应用蒙特卡洛方法计算了18种材料在不同能量下的γ射线线衰减系数,并拟合得出当物质材料和密度确定时γ射线的线衰减系数与能量的关系,从而重建出不同能量下的透射图像。Multi-energy method to rectify the linear attenuation coefficients in transmitted image reconstruction by tomographic gamma ray scanning was preliminarily explored. The gamma ray linear attenuation coefficients for different energies were calculated using Monte Carlo method for 18 different kinds of materials. The relationship between ray linear attenuation coefficient and energy was fitted for given material and density, so as to reconstruct transmitted image for different energies.

关 键 词：层析γ扫描 多能γ射线 线衰减系数 透射图像重建 

分 类 号：TL81[核科学技术—核技术及应用]