射线半影编码孔点扩散函数锐度展宽模拟评估  

Evaluation by Simulation to Point Spread Function of Emission Penumbral Imaging Encoding Pinhole

作　　者：吴岳雷[1] 郑向阳[1,2] 张博平[1] 胡华四[1] 

机构地区：[1]西安交通大学核科学与技术学院,陕西西安710049 [2]国家环境保护部核与辐射安全中心,北京100088

出　　处：《原子能科学技术》2010年第4期508-512,共5页Atomic Energy Science and Technology

基　　金：国家自然科学基金与中国工程物理研究院联合基金资助项目(10576022)

摘　　要：阐述了射线半影编码成像系统点扩散函数锐度展宽与一般系统点扩散函数半高宽的区别与联系,确立了半影编码成像系统锐度展宽概念,建立了半影编码孔成像系统蒙特卡罗模型。计算获得了0.662、1.25、2.45、5.0、10.0、14.06MeV等一系列能量点的γ射线与中子在半影编码成像系统点扩散函数,并按照定义算出γ射线与中子各能量系统点扩散函数的锐度展宽;得到γ射线和中子能量与半影编码成像系统锐度展宽函数关系,分析了半影编码成像系统点扩散函数锐度展宽的原因,为今后编码孔设计的改进提供理论依据。The differences and relations between sharpness broadening of penumbral imaging system and full width at half maximum （FWHM） of general system＇s point spread function （PSF）were illuminated and the concept of sharpness broadening of penumbral imaging system was determined. The penumbral encoding pinhole imaging system Monte-Carlo model was built; the system PSFs of 7 ray and neutrons in energy of 0. 662, 1.25, 2.45, 5.0, 10.0, 14.06 MeV and so on were calculated respectively. The function of the PSFs sharpness broadenings vs 7 ray and neutron energy was obtained and the broadening reasons of the system sharpness were analyzed in detail, the theoretical reference was presented for the future design improvement of encoding pinhole.

关 键 词：中子半影成像 编码孔 锐度展宽 点扩散函数 

分 类 号：TN25[电子电信—物理电子学] TP751[自动化与计算机技术—检测技术与自动化装置]