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Radioactive emission from high-index,optical glasses and atypical effects on CCDs
Author(s): Michael L. Edgar; Ross Zhelem; Lewis Waller; Janez Kos; Don Mayfield; Naveen Pai; Andrew Sheinis; Gayandhi De Silva; Jeffrey Simpson; Nicholas Stazak
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Paper Abstract

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.

Paper Details

Date Published: 10 July 2018
PDF: 12 pages
Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 1070633 (10 July 2018); doi: 10.1117/12.2307305
Show Author Affiliations
Michael L. Edgar, Australian Astronomical Observatory (Australia)
Ross Zhelem, Australian Astronomical Observatory (Australia)
Lewis Waller, Australian Astronomical Observatory (Australia)
Janez Kos, The Univ. of Sydney (Australia)
Don Mayfield, Australian Astronomical Observatory (Australia)
Naveen Pai, Australian Astronomical Observatory (Australia)
Andrew Sheinis, Australian Astronomical Observatory (Australia)
Canada-France-Hawaii Telescope (United States)
Gayandhi De Silva, Australian Astronomical Observatory (Australia)
The Univ. of Sydney (Australia)
Jeffrey Simpson, Australian Astronomical Observatory (Australia)
Nicholas Stazak , Australian Astronomical Observatory (Australia)

Published in SPIE Proceedings Vol. 10706:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Ramón Navarro; Roland Geyl, Editor(s)

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