%0 Journal Article
%T Parameters Affecting the Characteristic of X-ray Source<br>影响X光源特性的参数研究
%A Liu Jun
%A Cui Wei
%A Shi Jiangjun
%A Liu Jin
%A Li Biyong Institute of Fluid Physics
%A CAEP
%A Mianyang Computer department
%A College of Engineering
%A CAEP
%A Mianyang
%A <br>刘军
%A 崔蔚
%A 施将君
%A 刘进
%A 李必勇
%J 光子学报
%D 2005
%I 
%X The characteristic of X ray source is one of the most important parameters on the image quality of radiography. The X ray source is composed of bremsstrahlung photons produced by the high energy electron beam impinging on the heavy metal target. The effects of parameters (include radius and emittance of the e beam and the target thickness) on the characteristic of X ray source are detailed by means of Monte Carlo method. It is shown that (1) giving a e beam radius, the exposure at 1m from the converting target increases and the uniformity of exposure distribution becomes bad, when the normalized emittance of e beam decreases; (2) for a given normalized emittance, the exposure uniformity becomes bad, when the e beam radius increases, but there exists an e beam radius under which the exposure at 1m is the largest; (3) in the case of zero emittance, enlarging the e beam radius can slightly improve the uniformity; and (4) given an e beam, there exists a target thickness which causes the exposure at 1m to be the largest. Therefore, the radius and emittance of e beam and the target thickness should be integrated with the design and Monte Carlo simulation for radiography.
%K Monte carlo simulation
%K Parameters of the electron beam
%K Converting target
%K Exposure<br>MC模拟
%K 电子束参数
%K 转换靶
%K 照射量
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=9F6139E34DAA109F9C104697BF49FC39&aid=DAA62C233231AF7F&yid=2DD7160C83D0ACED&vid=339D79302DF62549&iid=0B39A22176CE99FB&sid=79D2EF35F60110C2&eid=527AEE9F3446633A&journal_id=1004-4213&journal_name=光子学报&referenced_num=4&reference_num=9