  The fast timing, standard timing and easy timing are popular timing
configurations of compton suppression spectroscopy. Such spectroscopes always
use a module of coincidence or time-to-amplitude converter (TAC). A compton
suppression spectroscopy with semi-timing configuration is presented in this
paper. The semi-timing configuration is relatively simple and easy system
setup, especially this spectroscopy does not need to use module of coincidence
or TAC. The performance of spectroscopy was tested and summarized. The count
rate background, full peak efficiency and the ratios of area/background of
peaks in suppressed and unsuppressed modes were comparative.
