用于精确Geant4探测器建模的商用聚乙烯基甲苯闪烁体的光学特性测量
Optical Characterization Measurements of Commercial Polyvinyltoluene Scintillators for Accurate Geant4 Detector Modeling
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中文总结 AI 辅助
本研究测量了六种商用PVT闪烁体的波长相关光学性质，发现其色散与文献值偏差显著，验证模拟表明准确光学数据可影响探测器光子计数，为Geant4探测器建模提供关键参数。
中文摘要 AI 辅助
塑料闪烁体探测器的精确蒙特卡罗模拟需要依赖波长相关的光学性质。我们首次对六种商用聚乙烯基甲苯（PVT）基闪烁体（圣戈班BC-400、BC-404、BC-408、BC-418、BC-422和BC-430）在370-660 nm范围内的波长相关折射率n(λ)和体吸收长度L_abs(λ)进行了全面测量。通过使用精密折射装置和可变厚度透射测量，我们表征了材料特有的色散特性，该特性与制造商规格及纯PVT的文献值存在显著偏差。对BC-422探测器的验证模拟显示，与使用制造商提供的恒定折射率相比，采用我们测量的n(λ)时，探测到的光子数减少了7.2%，凸显了准确光学性质数据对探测器设计和校准的实际重要性。我们成功测量了BC-430在大部分可见光谱范围内的吸收长度（2.2-12.4 mm），以及所有材料在372 nm处的吸收长度（21-38 mm），同时为弱吸收配方在更长波长下建立了超过750 mm的下限。
英文摘要
Accurate Monte Carlo simulation of plastic scintillator detectors requires precise wavelength-dependent optical properties. We present the first comprehensive measurements of wavelength-dependent refractive index $n(λ)$ and bulk absorption length $L_{\mathrm{abs}}(λ)$ for six commercial polyvinyltoluene (PVT)-based scintillators (Saint Gobain BC-400, BC-404, BC-408, BC-418, BC-422, and BC-430) across the 370-660 nm range. Using a precision refraction apparatus and variable-thickness transmission measurements, we characterize material-specific dispersion that deviates substantially from both the manufacturer specification and literature values for pure PVT. Validation simulations of a BC-422 detector demonstrate a 7.2% reduction in detected photon counts when using our measured $n(λ)$ compared to the constant manufacturer value, highlighting the practical importance of accurate optical property data for detector design and calibration. We successfully measure absorption lengths for BC-430 across most of the visible spectrum (2.2-12.4 mm) and for all materials at 372 nm (21-38 mm), while establishing lower bounds exceeding 750 mm for weakly absorbing formulations at longer wavelengths.
