伽玛成像探测器空间分辨与相对发光效率
Space resolution and relative scintillation efficiency of gamma imaging detector
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摘要: 激光尾波场加速伽玛射线源有望成为新一代小型强伽玛射线源。这种射线源具有高能量、高亮度、小焦斑、超短脉冲输出等特点。利用Geant4蒙特卡罗软件包，计算了高能尾波场加速电子在高原子序数靶上的轫致辐射谱，同时在轫致辐射谱的范围内，计算了几种常用伽玛探测晶体相对发光效率和点扩展函数，分析了它们与晶体厚度、材料及入射伽玛能量之间的关系，为将来伽玛探测器的设计提供了理论参考。Abstract: Laser wake field accelerator is hopeful to become a new minitype gamma source. This type of source has excellent performance characteristics such as high energy, high brightness, small focal spot and ultra shot pulse export. Bremsstrahlung spectra produced by high wake field accelerated electron incident on high Z target is calculated by Monte-Carlo toolkit Geant4, and relative scintillation efficiency and point spread function of several gamma detecting crystal are calculated in the range of bremsstrahlung spectra. The relations between crystal thickness, crystal materials, incident gamma energy and the calculated results are analysed. All these provide important guidance for designing gamma detector in future．
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Key words:
- gamma source /
- laser wake field /
- scintillation efficiency /
- point spread function /
- imaging detector
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