Radioactive emission from high-index,optical glasses and atypical effects on CCDs

Michael L. Edgar, Ross Zhelem, Lewis Waller, Janez Kos, Don Mayfield, Naveen Pai, Andrew Sheinis, Gayandhi De Silva, Jeffrey Simpson, Nicholas Stazak

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

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.
Original languageEnglish
Title of host publicationAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
EditorsRamón Navarro, Roland Geyl
Place of PublicationBellingham, Washington
PublisherSPIE
Number of pages12
ISBN (Electronic)9781510619661
ISBN (Print)9781510619654
DOIs
Publication statusPublished - 10 Jul 2018
Externally publishedYes
EventAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation III 2018 - Austin, United States
Duration: 10 Jun 201815 Jun 2018

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume10706
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation III 2018
CountryUnited States
CityAustin
Period10/06/1815/06/18

Keywords

  • Artefacts
  • CCD
  • Charge trapping
  • HERMES
  • High-index
  • Optical glass
  • Radioactivity

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