辐射源旋转台阶成像技术  

Radiation source imaging with rotating edge

作　　者：李宏云[1] 马继明[2] 宋顾周[2] 刘以农[1] 张占宏[2] 韩长才[2] 

机构地区：[1]清华大学工程物理系,北京100084 [2]西北核技术研究所,西安710024

出　　处：《强激光与粒子束》2007年第10期1735-1738,共4页High Power Laser and Particle Beams

摘　　要：提出了用旋转台阶对辐射源成像的方法。对台阶响应曲线微分可得到辐射源2维出射强度沿台阶方向的1个投影,通过旋转台阶体,可得到完整的正弦图,从而可用层析重建算法重建出辐射源区的强度分布。用钨合金台阶体在1个60Co源上进行成像实验,从400个角度的台阶响应数据重建出60Co源活性区图像,表明该方法是可行的。此方法可推广到大孔径圆孔台阶体,用于测量X射线焦点等小尺寸辐射源的尺寸。A new approach to radiation source imaging with a rotating edge was proposed. Differentiating the edge response curve can yield the integration of the emission intensity of the source along the direction of the edge, which is similar to the projection of a source in CT technology. Multiple projections from different directions can be obtained by rotating the edge, from which the distribution of source intensity can be reconstructed. A tungsten alloy step edge was used in the imaging experiment on a so Co gamma source. The image of the active region of the source could be reconstructed from the edge responses of 400 projections, indicating this new approach is feasible. It can be applied to measure the size of small radiation sources, such as the focus of an X- ray generator, using a step edge with a round aperture.

关 键 词：辐射源 台阶 层析 图像重建 

分 类 号：O434.12[机械工程—光学工程]