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采用Monte Carlo方法模拟了HgI_2、非晶Se和CdTe几种直接X射线转换探测器在医用X射线范围(10—100keV)的透过谱、背向散射谱、吸收效率和光电灵敏度.对X射线和HgI_2的作用过程模拟采用了EGSmc Monte Carlo代码系统,对信号电荷的产生考虑了电荷产生的高斯噪声和材料深陷阱作用造成的部分电荷收集影响.结果表明,载流子平均自由程(Schubweg)在相对于探测材料厚度较小时,陷阱作用能很大地影响探测灵敏度.HgI_2的灵敏度是非晶Se的5倍以上,CdTe的灵敏度是非晶Se的10倍以上,采用高Z序数材料可以大大提高探测灵敏度.
The Monte Carlo method was used to simulate the transmission spectrum, backscattering spectrum, absorption efficiency and photoelectric sensitivity of HgI_2, amorphous Se and CdTe direct-current X-ray detectors in medical X-ray range (10-100keV) And HgI_2, the EGSmc Monte Carlo code system was used to simulate the process of charge generation, and the signal charge was generated by taking into account the charge-generated Gaussian noise and the partial charge-trapping effect caused by the material’s deep trapping effect. The results show that the mean free path (Schubweg) The trap effect greatly affects the detection sensitivity when the thickness is smaller than that of the probe material. The sensitivity of HgI_2 is more than 5 times that of amorphous Se, the sensitivity of CdTe is 10 times that of amorphous Se, and the detection sensitivity can be greatly improved by using high Z- .