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首页> 外文会议>Conference on X-Ray and Gamma-Ray Detectors and Applications IV, Jul 7-9, 2002, Seattle, Washington, USA >Absolute light and resolution measurements for sensitive CsI(Tl)/photodiode detectors
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Absolute light and resolution measurements for sensitive CsI(Tl)/photodiode detectors

机译：灵敏的CsI（Tl）/光电二极管检测器的绝对光和分辨率测量

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摘要

To conserve volume and power, photodiode/scintillator combinations are strong candidates for gamma-ray detection in space applications. High sensitivity to MeV gamma rays necessitates large-volume scintillators, which are most effectively read out with large-area photodiodes. However, because photodiodes have unity gain, the electronic noise limits resolution, and therefore small-area photodiodes that minimize capacitance are preferred. Thus, optimization of resolution involves maximizing light production and transport in the scintillator and light collection in the photodiode, while minimizing photodiode area. Measurements of performance are reported for 1x1x1cm~3/10 x10mm~2, 80cm~3/l8xl8mm~2, and 85cm~3/10x10mm~2 CsI(Tl)/photodiode combinations. Each large scintillator was a single crystal, machined to a geometry that comprised a 40mm diameter x 50mm height cylindrical section that was extended through a 20°conical section to a square face that matched the respective photodiode sensitive surface. Absolute scales were estimated for the light output by measuring the photodiode responses to ~(241)Am (59.54keV), ~(57)Co (122.06 and 136.47keV), and ~(133)Ba (80.99keV) and assuming a value of 3.67eV/electron-hole pair. The photodiode quantum efficiencies for the CsI(Tl) emission spectrum, corrected for Si reflection back into the scintillator, was taken to be 0.835. We obtained values of 58.2, 46.7, and 34.6 photons/keV for the combined light production and transport into the CsI for the 1cm~3, ～80cm~3, and ～85cm~3 detectors, respectively. The best measured resolutions at 662keVfor the detectors were 5.9%, 7.2%, and 7.4% FWHM, respectively.
机译：为了节省体积和功率，光电二极管/闪烁体的组合非常适合在太空应用中进行伽马射线检测。对MeV伽玛射线的高灵敏度需要大体积的闪烁体，而大面积的光电二极管可以最有效地读出这些闪烁体。但是，由于光电二极管具有单位增益，因此电子噪声会限制分辨率，因此最好使用使电容最小的小面积光电二极管。因此，分辨率的优化包括使闪烁器中的光产生和传输最大化以及光电二极管中的光收集最大化，同时使光电二极管面积最小。报告了对1x1x1cm〜3/10 x10mm〜2、80cm〜3 / l8xl8mm〜2和85cm〜3 / 10x10mm〜2 CsI（Tl）/光电二极管组合的性能测量。每个大型闪烁体都是单晶，加工成包括40mm直径x 50mm高的圆柱部分的几何形状，该圆柱部分通过20°的圆锥形部分延伸到与相应的光电二极管敏感表面匹配的方形表面。通过测量光电二极管对〜（241）Am（59.54keV），〜（57）Co（122.06和136.47keV）和〜（133）Ba（80.99keV）的光电二极管响应并估算一个值来估算光输出的绝对比例3.67eV /电子-空穴对。 CsI（Tl）发射光谱的光电二极管量子效率（经Si反射回闪烁体的校正）取为0.835。对于1cm〜3，〜80cm〜3和〜85cm〜3的探测器，我们分别获得了58.2、46.7和34.6个光子/ keV的光产生和传输到CsI的值。对于探测器，在662keV的最佳测量分辨率分别为FWHM的5.9％，7.2％和7.4％。

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