Intercrystal Optical Crosstalk in Radiation Detectors: Monte Carlo Modeling and Experimental Validation

IF 4.6 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING IEEE Transactions on Radiation and Plasma Medical Sciences Pub Date : 2024-04-29 DOI:10.1109/TRPMS.2024.3395131
Carlotta Trigila;N. Kratochwil;B. Mehadji;G. Ariño-Estrada;E. Roncali
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Abstract

High-performance radiation detectors often employ crystal arrays where light can leak between them, a phenomenon called intercrystal crosstalk, which demands mitigation for optimal detector performance. The complexity of measuring optical crosstalk in conventional detector geometries makes optical Monte Carlo simulation essential to study and reduce crosstalk through better designs. Addressing the absence of validated transmission models in Monte Carlo toolkits, we developed and integrated a new simulation model into the look-up table Davis Model, aiming at simulating optical photon refraction at the crystal interfaces using GATE. For the first time, we validated the intercrystal optical crosstalk model with experiments in two optically coupled Lutetium-yttrium oxyorthosilicate crystals read by two SiPMs, testing three thicknesses and four interfaces (air, glue, Teflon, and ESR). Simulated and experimental crosstalk agreed within one FWHM for all configurations. These results show the possibility of predicting optical photon transmission in detector designs with multiple crystal elements. Indeed, although validated using only two crystals, the model can be used in more complex geometries. The model, available to GATE users upon request, provides a valuable resource for researchers when optimizing detector geometry where optical crosstalk needs to be considered, i.e., ensuring optical isolation between the photodetector’s responses.
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辐射探测器中的晶体间光学串扰:蒙特卡罗建模与实验验证
高性能辐射探测器通常采用晶体阵列,晶体间可能存在漏光现象,这种现象被称为晶体间串扰。测量传统探测器几何结构中光学串扰的复杂性使得光学蒙特卡罗模拟成为研究和通过更好的设计减少串扰的关键。针对蒙特卡罗工具包中缺乏经过验证的传输模型的问题,我们开发了一种新的模拟模型,并将其集成到查找表戴维斯模型中,旨在利用 GATE 模拟晶体界面上的光学光子折射。我们首次在两个光学耦合镥钇氧硅酸盐晶体中通过两个 SiPM 读取实验验证了晶体间光学串扰模型,测试了三种厚度和四种界面(空气、胶水、聚四氟乙烯和 ESR)。在所有配置中,模拟串扰和实验串扰都在一个 FWHM 范围内。这些结果表明,在具有多个晶体元件的探测器设计中,预测光学光子传输是可能的。事实上,虽然该模型仅使用两个晶体进行了验证,但可用于更复杂的几何结构。该模型可应要求提供给 GATE 用户,为研究人员优化需要考虑光学串扰的探测器几何结构(即确保光探测器响应之间的光学隔离)提供了宝贵的资源。
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来源期刊
IEEE Transactions on Radiation and Plasma Medical Sciences
IEEE Transactions on Radiation and Plasma Medical Sciences RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
8.00
自引率
18.20%
发文量
109
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