10—25keV电子致厚W,Au靶韧致辐射谱的测量  

Bremsstrahlung spectra produced by 10–25 keV electron impact on thick W,Au targets

作　　者：谭文静[1] 安竹[1] 朱敬军[1] 赵建玲[1] 刘慢天[1] 

机构地区：[1]四川大学原子核科学技术研究所辐射物理及技术教育部重点实验室,成都610064

出　　处：《物理学报》2016年第11期87-93,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11175123)资助的课题~~

摘　　要：测量了10—25 keV电子碰撞厚W,Au靶产生的韧致辐射谱,并与Monte Carlo程序PENELOPE模拟的X射线谱进行了比较,除在3 keV前实验谱略低于理论谱外,整体上两者符合得很好.在模拟电子与靶材料相互作用产生韧致辐射时,PENELOPE程序中只包含有普通韧制辐射的截面数据.实验结果表明,在电子与固体靶相互作用时,没有明显的极化韧致辐射产生,PENELOPE程序能够可靠地描述电子与固体厚靶相互作用产生的韧致辐射.Bremsstrahlung emission produced by electron impact on thick or thin targets is one of the fundamental radiation processes,and the interest in its study continues to grow because of its importance for understanding the interaction of electrons with matter and also for many practical applications.Nowadays,there has been some disagreement concerning whether or not the polarization bremsstrahlung,which is emitted by the atomic electrons in a target polarized by the incident charged particles,contributes to the total bremsstrahlung when the incident electrons bombard a solid target.Some reports suggested that the polarization bremsstrahlung does not significantly contribute to the total bremsstralung in experiments involving solid targets.However,some recent experimental data indicated that a significant amount of polarization bremsstrahlung contributes to the total bremsstrahlung when electrons from β-decays of radioactive nuclei bombard solid targets.In other papers,the comparison between the bremsstrahlung spectra produced by electron impact on different thick solid targets from low-Z to high-Z elements and the simulation spectra of Monte Carlo code PENELOPE showed that there are certain discrepancies between the experimental and simulation results,and on the whole the factors required for the experimental results and simulation spectra to match with each other seem to increase slightly with the target atomic number increasing and for high-Z elements experimental results are about 10% higher than simulation results.PENELOPE is a general-purpose Monte Carlo code that simulates coupled electron-photon transportation,in which simulation for bremsstrahlung is only based on ordinary bremsstrahlung and any contribution from polarization bremsstrahlung is not included.Therefore,whether the discrepancies between the experimental and simulation spectra are caused by the polarization bremsstrahlung or by other reasons remains to be further studied.In this paper,we improve the Faraday cup to measure the incident electron ch

关 键 词：电子碰撞 韧致辐射 MONTE CARLO模拟 

分 类 号：O562[理学—原子与分子物理]