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UV-transmitting (UVT) acrylic is a commonly used light-propagating materialin neutrino and dark matter detectors as it has low intrinsic radioactivity andexhibits low absorption in the detectors' light producing regions, from 350 nmto 500 nm. Degradation of optical transmittance in this region lowers lightyields in the detector, which can affect energy reconstruction, resolution, andexperimental 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 ofacrylic manufacturers. Significant degradation peaking at 343 nm was observedin some UVT acrylics with as little as three hours of direct sunlight, whileothers exhibited softer degradation peaking at 310 nm over many days ofexposure to sunlight. Based on their measured degradation results, safe timelimits for indoor and outdoor UV exposure of UVT acrylic are formulated.

UV Degradation of the Optical Properties of Acrylic for Neutrino and Dark Matter Experiments