UV degradation of the optical properties of acrylic for neutrino and dark matter experiments
UV degradation of the optical properties of acrylic for neutrino and dark matter experiments
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DOI：
10.1088/1748-0221/4/09/t09001
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发表时间：
2009-07
影响因子：
1.3
通讯作者：
B. Littlejohn;K. Heeger;T. Wise;E. Gettrust;M. Lyman
中科院分区：
文献类型：
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作者：
B. Littlejohn;K. Heeger;T. Wise;E. Gettrust;M. Lyman
紫外线透射（UVT）丙烯酸是中微子和暗物质探测器中常用的光传播材料，因为它具有低固有放射性，并且在探测器的光产生区域（从350 nm到500 nm）中表现出低吸收。该区域光学透射率的下降会降低检测器中的光输出，这会影响能量重建、分辨率和实验灵敏度。我们检查透射率损失的结果，短期和长期的紫外线暴露的各种UVT丙烯酸样品从一些丙烯酸制造商。在一些UVT丙烯酸树脂中观察到在343 nm处的显著降解峰值，只有三个小时的直射阳光，而另一些在310 nm处的降解峰值在暴露于阳光的许多天内表现出较软的降解峰值。根据其测量的降解结果，UVT丙烯酸的室内和室外紫外线暴露的安全时间限制制定。
UV-transmitting (UVT) acrylic is a commonly used light-propagating material in neutrino and dark matter detectors as it has low intrinsic radioactivity and exhibits low absorption in the detectors' light producing regions, from 350 nm to 500 nm. Degradation of optical transmittance in this region lowers light yields in the detector, which can affect energy reconstruction, resolution, and experimental sensitivities. We examine transmittance loss as a result of short- and long-term UV exposure for a variety of UVT acrylic samples from a number of acrylic manufacturers. Significant degradation peaking at 343 nm was observed in some UVT acrylics with as little as three hours of direct sunlight, while others exhibited softer degradation peaking at 310 nm over many days of exposure to sunlight. Based on their measured degradation results, safe time limits for indoor and outdoor UV exposure of UVT acrylic are formulated.