Preliminary time resolution results for the active CsI collimator and
the BGO anti-Compton shield are presented in this chapter for a
source. The results
were obtained by measuring the time response of the two detectors relative
to that of a fast plastic scintillator. All measurements were performed
using FL-8000 fast amplifiers with differention time off and integration
time on int-2 (switch board: 1,3,4,8=on, 2,5,6,7=off). The constant fraction
discriminator (CF-8000) had a delay of 24 ns for both detectors.
The time spectrum was not energy-gated. The measured FWHM was 26 ns
for the active CsI collimator and 9 ns for the BGO anti-Compton shield.