F D G Bennett and D G Thorpe 1970 J. Phys. E: Sci. Instrum. 3 241 doi:10.1088/0022-3735/3/3/420
F D G Bennett and D G Thorpe
Show affiliationsGain degradation measurements have been carried out on five 419BL and two 318BL Mullard lead-type channel electron multipliers, over periods up to several thousand hours, at a pressure of less than 10 ntorr. The devices showed reductions of about one order of magnitude on their initial gain values. The reduction occurred in 10 h at an output count rate of 2 × 105 counts s−1 and several thousand hours at 2 × 102 counts s−1. At the high output count rate, the initial gain was found to be depressed by over an order of magnitude on the nominal value of 108.
85.60.Ha Photomultipliers; phototubes and photocathodes
07.30.Kf Vacuum chambers, auxiliary apparatus, and materials
Issue 3 (March 1970)
Received 6 November 1969
F D G Bennett and D G Thorpe 1970 J. Phys. E: Sci. Instrum. 3 241
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