康普顿散射对X射线透射谱的影响

Compton effect on X-ray transmission spectrum

摘要:

采用一定组分的材料对X射线进行辐射屏蔽，可以吸收大部分的低能光子，减少X射线对电子系统的辐射损伤。但通过研究发现，由于康普顿散射的影响，在一定条件下，透射谱中的低能光子数不但没有减少反而大于入射谱，这对于电子元器件的辐射防护是不利的。通过改变入射源光子能谱、探测器位置、屏蔽材料类型以及屏蔽材料厚度等参量，采用蒙特卡罗方法计算并分析了散射光子对X射线透射谱的影响，得到了康普顿散射光子对X射线透射谱的影响规律，并提出了降低散射光子影响的几种措施。

Abstract:

Shield material with some certain composition can absorb a large part of low energy photon of X-ray and reduce the radiation effect on electronic component. However，in some cases，photon quantity of several low energy bins in transmission spectrum will be larger than that in incidence spectrum due to Compton scattered photons. This is disadvantageous for radiation protection. The study discussed such factors relative to scattered photon impact as source photon energy，the place of detector，the composition and the thickness of shield material. Under several different conditions，X-ray transmission spectra were calculated. The rule of Compton photons affecting on X-ray transmission spectrum was found. Lastly，some countermeasures were put forward.