康普顿探测器优化设计
Optimization design of Compton detector
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摘要: 康普顿探测器可以获得脉冲X射线照射量随时间变化的波形,探测器特性主要由收集体、介质和金属外壳的材料、尺寸决定。针对神龙一号加速器产生的X射线的能谱结构,应用蒙特卡罗模拟方法,进行探测器结构尺寸设计,获得最佳的有机玻璃介质厚度为30 mm。探测器灵敏度系数随X光能量变化的曲线表明其能量响应较差,分析与计算结果表明在收集体前加低Z金属可有效改善能量响应特性并提高灵敏度系数。计算得到用于测量神龙一号加速器的X射线照射量的康普顿探测器的灵敏度系数为6.86×1011 (C/kg)-1。Abstract: The Compton detector, with fast time response, linear range over many orders of magnitude and low sensitivity to X-ray fluxes, can be used to measure the dose of time resolved X-ray, whose sensitivity is decided by the materials and dimensions of its collector, dielectric and metal case. Since the detector dimension is energy dependent, there will be an optimal dimension for a detector to measure bremsstrahlung X-ray dose. Monte-Carlo method was used to design a Compton detector which will be used to measure the bremsstrahlung X-ray dose produced by the Dragon-Ⅰ accelerator. The bremsstrahlung spectrum of Dragon-Ⅰ was computed by MCNP program, as well as the Compton electron number as a function of plexiglass thickness, aluminum case thickness and plumbum collector thickness. According t
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Key words:
- compton effect /
- x-ray /
- dose /
- sensitivity
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