研究目的
To investigate the formation and fading of temporary and permanent defects in plastic scintillators under controlled temperature and humidity conditions, and to evaluate their effects on optical properties.
研究成果
Temporary fogging reduces optical transmission by at least 50%, negatively affecting light collection in scintillators. Defogging is diffusion-driven, with similar rates across materials. Temporary defects reappear in the same locations, indicating underlying permanent defects. The new formulation (NF) resists fogging. Future work should focus on comparing fogging effects in various compositions.
研究不足
The study is limited to small samples (≤1 in3) and may not fully represent behavior in full-size detectors. Accelerated aging tests do not account for all real-world environmental fluctuations. The mechanisms of permanent defect formation are not fully understood.
1：Experimental Design and Method Selection:
Accelerated aging experiments using temperature and humidity cycling to induce fogging in plastic scintillators. Methods include environmental chamber experiments and water saturation experiments to simulate outdoor conditions.
2：Sample Selection and Data Sources:
Samples include field-aged PVT (FA1 and FA2), fresh EJ-200 PVT (FPVT), a new fogging-resistant formulation (NF), polystyrene (PS), and poly methyl methacrylate (PMMA). Samples were cut and polished to specific sizes.
3：List of Experimental Equipment and Materials:
Environmental chamber (Thermotron SM
4：0 8200), spectrofluorometer (Horiba Jobin Yvon Fluorolog 3), spectrophotometer (Varian Cary 5000 UV–VIS–NIR), optical microscope (KEYENCE VHX-1000), deionized water, polishing papers (600, 800, 1200 grit), lapping oil. Experimental Procedures and Operational Workflow:
Saturation of samples in high-humidity air or liquid water at 55°C, followed by cooling to induce fogging. Defogging monitored over time in ambient conditions. Optical and gravimetric measurements taken before and after experiments.
5：Data Analysis Methods:
Photoluminescence and optical transmission data analyzed for changes due to fogging. Gravimetric analysis used to measure water uptake and desorption. Optical microscopy for defect observation and size measurement.
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