Background events in microchannel plates

Details Background events in microchannel plates Background events in microchannel plates

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988itns...35..524s&link_type=abstract

(IEEE, DOE, Lawrence Livermore National Laboratory, et al., Nuclear Science Symposium, 34th, and Symposium on Nuclear Power Syst

Astronomy and Astrophysics

Astronomy

18

Astronomical Spectroscopy, Background Radiation, Microchannel Plates, Radiation Distribution, Electron Emission, Gamma Rays, Potassium 40, Radioactive Decay

Scientific paper

Measurements 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).

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