tailieunhanh - The algorithms for neutron pulse detection with scintillation detector

The results show that the figure of merits (FOM) of rise-time discrimination method, pulsed gradient analysis method, charge comparison method, and correlation pattern method are , , and , respectively. | TẠP CHÍ KHOA HỌC - ĐẠI HỌC ĐỒNG NAI, SỐ 03 - 2016 ISSN 2354-1482 THE ALGORITHMS FOR NEUTRON PULSE DETECTION WITH SCINTILLATION DETECTOR ThS. Phan Văn Chuân1 ThS. Trương Văn Minh2 ThS. Nguyễn Ngọc Anh3 ThS. Nguyễn Đắc Châu4 ThS. Vũ Thị Thanh Quý 5 ABSTRACT The interference of gamma in neutron spectra reduces the accuracy of measurement results, especially when using the scintillation detector. The digital method can be used to identify either neutron or gamma pulses. In order to select the algorithm for NE213 scintillation detector, the Matlab Simulink tool was used to simulate neutron counting system. The results show that the figure of merits (FOM) of rise-time discrimination method, pulsed gradient analysis method, charge comparison method, and correlation pattern method are , , and , respectively. Keywords: FOM, neutron-gamma pulse shape discrimination, simulation of neutron and gamma pulse,correlation pattern method and digital signal processing (DSP). 1. Introduction That makes the PSD methods widely The neutron - gamma pulse modern PSD systems, pulses shape discrimination (PSD) technique is from detector are digitized by flash very important in neutron radiation ADC and the dataare stored in memory measurements using the scintillation and analyzed by PSD method on detector. NE-213 detectors can detect computer[5-7], or on the board both neutron and photon, but their pulse FPGA/DSP [4]. Almost all studies of shapes can be distinguished. neutron - gamma PSD were performed on different detectors in each way, Various neutron - gamma therefore the evaluation of capacities of discrimination techniques have been neutron-gamma PSDs have not carried developed, including both analog and out. digital such as zero crossing, constant fraction discriminator[1,2], charge comparison[2,3], frequency gradient analysis[4], rise time discrimination, pattern recognition[5], etc. In the Dalat research reactor, we plan to setup a neutron counting .