摘要
以带通平响应为优化目标，通过残余响应、带外残余响应相对误差以及残余响应平整度3个参数来优化滤片的厚度，设计了一套共有7个能量通道、连续覆盖18-88keV能谱范围的Ross滤片谱仪。该谱仪能量通道宽度在2～20keV之间。多数能量通道的带外残余响应相对误差低于10％，残余响应平整度优于20％。将该谱仪应用于微聚焦x光机上的高z金属球壳高能x射线背光照相实验，结果表明：在不同的实验条件下，Ross滤片谱仪测得的能谱形状与理论模型给出的结果符合较好，测得的能谱不仅能够很好地解释背光照相图像，而且可用于根据图像反推客体的面密度。
A Ross filter spectrometer, consisting of 7 energy channels and covering 18 88 keV energy range, was designedby calculation with the optimization goal of band-pass flat response, in which the residual response, relative error outside the ener-gy channels and flatness inside energy channels were used to optimize the thickness of the filters. The energy channel width of thespectrometer was between 2 keV and 20 keV. The relative error and flatness were lower than 10G and 20G respectively for mostenergy channels. This spectrometer was applied to experiments performed on a microfocus X-ray tube in which high-energy X raywas used to backlit spherical shell samples made of high-Z metals. The results show that, under different experimental condi-tions, spectra measured by Ross filter spectrometer were in agreement with theory models. The measured spectra interpreted theimages quite well and could be used to obtain areal density from the images.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2015年第12期65-70,共6页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(11475154)
