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10 July 2018 Radioactive emission from high-index,optical glasses and atypical effects on CCDs
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Large-amplitude anomalous events have been observed in CCDs due to radioactive emission from high-index optical glasses, some producing charge-trapping like artefacts. We have identified the source of these events from one glass (Ohara S-YGH51) as α-particles from trace amounts of nuclides in the actinium decay series, parent 235U. We present measurements of the anomalous event rate for samples of 15 separate optical glasses with nd ≥ 1.6. There is a variation in anomalous count rates of orders of magnitude range over these materials. Care should be taken in the selection of optical glasses to be located in close proximity to detectors.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael L. Edgar, Ross Zhelem, Lewis Waller, Janez Kos, Don Mayfield, Naveen Pai, Andrew Sheinis, Gayandhi De Silva, Jeffrey Simpson, and Nicholas Stazak "Radioactive emission from high-index,optical glasses and atypical effects on CCDs", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 1070633 (10 July 2018);

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