Energy spectrum measurement for pulsed hard X-ray from 15 keV to 600 keV
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摘要: 介绍了基于吸收法的脉冲硬X射线能谱测量的基本原理及设计思路，完成了探测器及吸收片的选型，设计了射线准直系统，研究了散射对测量的影响，以12路PIN探测器阵列及铜、铝吸收片为测量核心部件研制了脉冲硬X射线能谱测量系统。实验测量了真空环境下“闪光二号”加速器串级二极管产生的脉冲硬X射线强度，获得了不同衰减程度的实验波形，通过解谱获得了脉冲硬X射线的能谱，光子最高能量约600 keV，平均能量约89.1 keV，与理论计算的结果比较符合。Abstract: This paper introduces the basic principle and design ideas of absorptive method for X-ray energy spectrum measurement. Si-PIN detectors array and Cu, Al attenuation materials were used to design the energy spectrometer combining theoretical calculation and experimental study. The collimating and anti-interference system was developed to obtain higher signal-to-noise ratio waveforms. The influence of scattering was researched. The different attenuation waveforms of pulsed hard X-ray at ShanguangⅡ accelerator were measured experimentally in the vacuum environment. The energy spectrum was calculated. The maximum energy of X-ray was about 600 keV, and the average energy was about 89.1 keV, which agreed with the calculation results.
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图 1 散透射比例随探测器距离的变化趋势
Figure 1. Change of scatter-transmission ratio under difference distance of the detectors
图 3 光子经过不同质量厚度的吸收片后在探测器上的能量沉积曲线
Figure 3. Energy deposition curves of photon on the detectors after absorption plate of different mass thickness
图 6 能谱实验结果和理论计算对比
Figure 6. Spectrum comparison between experiment energy and theoretical calculation
表 1 散透射比为5%时对应的探测器与铜吸收片的距离
Table 1. Distance between the detector and the copper absorption plate when scatter-transmission ratio is 5%
thickness of the copper absorption plate/mm 1.00 2.16 4.10 5.01 7.00 7.98 10.07 12.00 distance between the detector and the copper absorption plate/cm 0.42 1.0 1.8 2.6 2.9 3.5 4.4 5.1 
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