، صفحه 0-0 (1)

عنوان دوره: اولین دوره بین المللی و بیست و هشتمین دوره ملی (1400)

Compton scattering events are the main source of error on the peak counting during the Neutron Activation Analysis (NAA). The application of compton suppressor system in instrumental NAA reduces the detection limit of the technique and leads to a data with higher degree of precision. In this paper, a two-dimensional pseudo coincidence Compton suppressor system is presented for the NAA technique. The system is established based on a CAEN digitizer which directly records the pre-amplifier output signals of the two HPGe detectors. The recorded events in list mode file are analyzed offline by a Matlab code and the correlated photopeak events are realized. The performance of the system for Compton suppression is tested by measuring the gamma lines of 133Ba and 137Cs standard sources. The results show that the presented technique provides the peak to Compton ratio up to 104 and can be an alternative for conventional Compton suppressor systems.

Compton suppressor؛ Neutron Activation Analysis؛ list mode؛ Digitizer