| 线吸收系数能谱效应解析法研究 |
| |
| 引用本文： | 刘进,刘军,李必勇,施将君.线吸收系数能谱效应解析法研究[J].强激光与粒子束,2004,16(10):1356-1360. |
| |
| 作者姓名： | 刘进 刘军 李必勇 施将君 |
| |
| 作者单位： | 中国工程物理研究院 流体物理研究所, 四川 绵阳 621900 |
| |
| 基金项目： | 国防科技基础研究基金资助课题 |
| |
| 摘 要： | 用数值模拟的方法研究了FTO客体材料的线吸收系数随着穿透材料深度的变化关系，并拟合出材料有效线吸收系数与厚度之间的函数表达式。研究结果表明，在闪光照相中X光能谱发生了硬化，并随着穿透材料深度的增加谱平均线吸收系数会随之减小。FTO客体中钨的平均有效线吸收系数0.838（4.53%）cm-1，铜的平均有效线吸收系数0.297（4.96%）cm-1，能谱效应对有效线吸收系数的影响小于5%。在图像重建中利用上述的线吸收系数能够反演出精度达5%的材料密度。
|
| 关 键 词： | 闪光照相 有效线吸收系数 谱硬化 解析法 |
| 文章编号： | 1001-4322(2004)10-1356-05 |
| 收稿时间： | 1900-01-01; |
| 修稿时间： | 2003年10月9日 |
Research on spectrum effect on attenuation coefficient with analytical method |
| |
| LIU Jin,LIU Jun,LI Bi-yong,SHI Jiang-jun.Research on spectrum effect on attenuation coefficient with analytical method[J].High Power Laser and Particle Beams,2004,16(10):1356-1360. |
| |
| Authors: | LIU Jin LIU Jun LI Bi-yong SHI Jiang-jun |
| |
| Institution: | Institute of Fluid Physics, CAEP P.O.Box 919 105, Mianyang 621900, China |
| |
| Abstract: | The relation between the line attenuation coefficient and the material thickness of FTO has been studied, and the function between them has been given. The results show that the efficient linear attenuation coefficient decreases when the thickness of material increases in the transmission direction of X-ray. Specially,the average efficient attenuation coefficient in the FTO is 0.838cm~(-1) for tungsten with precision of 4.5% and 0.297cm~(-1) for copper with precision of 5.0%. The spectrum effect on attenuation coefficient is less than 5%. The material densities can be reconstructed with such precision. |
| |
| Keywords: | Radiography Efficient linear attenuation coefficient Spectrum hardening Analytical method |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《强激光与粒子束》浏览原始摘要信息 |
| 点击此处可从《强激光与粒子束》下载免费的PDF全文 |
