闪光照相条件下相对质量吸收系数的测量

Measurement of relative mass absorption coefficients for flash radiography

介绍了闪光照相中X光传播规律的等效单能模型。针对闪光照相出光重复性差、能谱测量困难的特点提出了相对质量吸收系数的概念。阐述了闪光照相中相对质量吸收系数的测量原理和方法。在闪光照相实验设备上采用整条D～L曲线对钨材料相对质量吸收系数进行了测量,得到的实验结果为1.23,与数值模拟结果1.26符合较好。

Principle of flash X-ray radiography was introduced and relative mass absorption coefficient were put forward for flash radiography. Based on mono-energy model, the radiographic image was determined by path-length of object only, so the relative mass absorption coefficient could be measured from the image's optic density versus path-length curve. The relative mass absorption coefficient of tungsten was measured from the images of two triangular prism made of tungsten and Fe respectively, which is 1.23, very close to the simulating result 1.26.