A Compton-suppression NaI(Tl) detector has been designed and its performance has been tested using
60 Co and 207 Bi standard sources. We have made a large polystyrene scintillator of 18 cm° 20 cm length from styrene, PPO and POPOP. The NaI(Tl) detec...
A Compton-suppression NaI(Tl) detector has been designed and its performance has been tested using
60 Co and 207 Bi standard sources. We have made a large polystyrene scintillator of 18 cm° 20 cm length from styrene, PPO and POPOP. The NaI(Tl) detector, 4 4 5 cm
3, is surrounded by a cylindrical plastic scintillator and a lead shielding block. Two plastic scintillator signals and
a NaI(Tl) detector signal are digitized by using a 12-bit CAMAC analog - to digital convertor
(ADC). The Compton-suppression factor ranges from 1.6 at the Compton-edge to 4 for the back-
scattered peak. The plastic scintillator turns out to have a very good performance for the Compton suppression in the region of Compton continuum and of backscattering from the surrounding shield materials.