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Background events in microchannel platesMeasurements have been made to assess the characteristics and origins of background events in microchannel plates (MCPs). An overall background rate of about 0.4 events/sq cm persec has been achieved consistently for MCPs that have been baked and scrubbed. The temperature and gain of the MCPs are found to have no significant effect on the background rate. Detection of 1.46-MeV gamma rays from the MCP glass confirms the presence of K-40, with a concentration of 0.0007 percent, in MCP glass. It is shown that beta decay from K-40 is sufficient to cause the background rate and spectrum observed. Anticoincidence measurements indicate the the background rate caused by cosmic ray interactions is small (less than 0.016 events/sq cm per sec).
Document ID
19880055010
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Siegmund, O. H. W.
(California Univ. Berkeley, CA, United States)
Vallerga, J.
(California Univ. Berkeley, CA, United States)
Wargelin, B.
(California, University Berkekey, United States)
Date Acquired
August 13, 2013
Publication Date
February 1, 1988
Publication Information
Publication: IEEE Transactions on Nuclear Science
Volume: 35
ISSN: 0018-9499
Subject Category
Instrumentation And Photography
Accession Number
88A42237
Funding Number(s)
CONTRACT_GRANT: NGL-05-003-497
Distribution Limits
Public
Copyright
Other

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