The characteristics of a multianode photomultiplier tube (MAPMT; Hamamatsu
R5900-00-M64) with 64 anodes have been studied. We report measurements that
include single photoelectron sensitivity, electrical and optical crosstalk
, dark count, and gain variation. Environmental test results relevant to us
e of these devices in space are also presented. The characteristics of the
MAPMT make it well suited for detection of light from scintillating fibers
as well as other applications. (C) 2001 Elsevier Science B.V. All rights re
served.