AI 中文总结
本研究通过模拟CeBr$_3$闪烁体探测器，利用光学光子波长信息在光子计数重叠时区分662与629 keV伽马射线，实现约2个标准差的能量鉴别，证明光谱可补充能量信息。
AI 中文摘要
我们证明，当探测光子计数分布在邻近伽马射线能量下重叠时，对单个探测到的光学光子的波长测量可能提供关于沉积在CeBr$_3$晶体中的伽马射线能量的额外信息。在$25\times25\times20~\text{mm}^3$的CeBr$_3$晶体的Geant4模拟中，使用了单能的662和629 keV伽马射线。假设光产额为$6.0\times10^4$光子/MeV，波长无关的光子探测效率为30%，波长分辨率为$\tau_{\lambda}=40$ nm，我们发现，在相同的约1%宽的探测光子计数区间内选定的662和629 keV事件群体中，重建波长高于385 nm的光子比例给出了约2个标准差的事件级分离。未使用时间或重建相互作用位置信息。结果表明，在当前模拟模型内，事件依赖的光谱可以保留超出未分化光子计数的能量信息。
英文摘要
We show that wavelength measurements of individual detected optical photons may provide additional information about gamma-ray energy deposited in a CeBr$_3$ crystal when the detected-photon-count distributions overlap for nearby gamma-ray energies. Monoenergetic 662 and 629 keV gammas are used in a Geant4 simulation of a $25\times25\times20~\mathrm{mm^3}$ CeBr$_3$ crystal. Assuming a light yield of $6.0\times10^4$ photons/MeV, a wavelength-independent photon-detection efficiency of 30%, and a wavelength resolution of $σ_λ=40$ nm, we find that the fraction of photons reconstructed above 385 nm gives an event-level separation of $\sim$ 2 standard deviations between the 662 and 629 keV event populations selected within the same $\sim$ 1%-wide detected-photon-count interval. No timing or reconstructed interaction-position information is used. The result demonstrates, within the present simulation model, that event-dependent optical spectra can retain energy information beyond an undifferentiated photon count.
