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。
The Compton detector, with fast time response, linear range over many orders of magnitude and low sensitivity to X-ray fluxes, can he 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 to the calculated results an optimal Compton detector has been designed. Its energy response of sensitivity was calculated and the results is not as good as expected. Thus the detector was modified with aluminum in front of the collector and the calculated sensitivity for bremsstrahlung produced by Dragon-Ⅰ is improved to 6.86 ×10^11（C/kg）^-1.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2010年第3期635-638,共4页
High Power Laser and Particle Beams
