减小电子涨落的指向概率虚拟源方法  

Method for creating virtual X-ray source with pointing probability method to decrease electron fluctuation

作　　者：景越峰[1] 黄娇凤[1] 张绚[1] 刘军[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《强激光与粒子束》2013年第1期150-152,共3页High Power Laser and Particle Beams

基　　金：中国国防科技预研项目

摘　　要：为了减小X射线辐射照相蒙特卡罗模拟中成像平面上电子结果的涨落,尝试了一种新指向概率虚拟源方法。该方法利用指向概率法产生成像平面电子的主要来源——虚拟X射线源,不仅在一次历史中增加了模拟电子的概率,而且使一次模拟对更多的记录点有贡献。使用指向概率虚拟源方法模拟结果表明:在X射线辐射照相中,指向概率虚拟源方法有效地减小了电子贡献的涨落,改善了模拟结果,提高了MCNP模拟X射线辐射照相过程的能力。In order to decrease the fluctuation of electron＇s record at imaging plane in MCNP＇s simulation of X-ray radio- graphy, a new method was tried for creating virtual X-ray source with pointing probability method. The virtual X ray source may generate the next main electrons which has contribution to the detector. This method can not only increase the possibility of the electron, but also make a history contribute pixels as much as possible. The comparision of the results whether using the pro posed method or not was carried out. The results show that the using of the method could decrease the fluctuation of the electron~ s contribution effectively, improve the presion of the result, and develop the simulation capability of MCNP for X-ray radiograph- y.

关 键 词：X射线辐射照相 电子输运 X射线虚拟源 电子涨落 指向概率法 

分 类 号：R581.1[医药卫生—内分泌]