I suggest using a cobalt-60 source to set thresholds. My recollection
is that Co-60 emits photons of 1.2 MeV. The Compton "edge" for these
in the plastic is 1.0 MeV, pretty close to the suggested 1.1 MeV.
-- John R. Calarco Dept. of Physics Univ. of New Hampshire Durham, NH 03824 phone: (603)862-2088 FAX: (603)862-2998 email: calarco@unh.edu
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