The ability discrimination of neutrons/gamma-rays of the detector was evaluated by the charge comparison (CC) method using an 252Cf source. The total efficiencies when measured on 22Na, 137Cs, 60Co and 252Cf sources were obtained , , and , respectively. The Figure of Merit (FoM) values of CC method were – for the range of energy 50–1000 keVee (keV electron equivalent). | Manufacture of a fast neutron detector using EJ-301 liquid scintillator SCIENCE AND TECHNOLOGY DEVELOPMENT JOURNAL- 76 NATURAL SCIENCES, VOL 2, ISSUE 2, 2018 Manufacture of a fast neutron detector using EJ-301 liquid scintillator Phan Van Chuan, Nguyen Duc Hoa, Nguyen Xuan Hai, Nguyen Duy Tan Abstract—A fast neutron detector using the EJ- slow components of the scintillator light that 301 scintillator was manufactured for study on depends on different kinds of radiation [1, 4, 5]. detecting fast neutrons and gamma-rays. Detector By coupling a photo multiplier tube (PMT) – to characteristics include the energy linearity, the the scintillator, the light can be collected and efficiency response and the neutron/gamma converted into a voltage pulse, allowing for data discrimination were guaranteed for neutron acquisition/processing [1, 6]. Those properties are detection in the energy range from 50 to 3000 commonly used to identify neutrons and gamma- keVee. The ability discrimination of neutrons/gamma-rays of the detector was evaluated rays by using pulse shape discrimination (PSD) by the charge comparison (CC) method using an techniques. 252 Cf source. The total efficiencies when measured Many PSD algorithms have been evaluated and on 22Na, 137Cs, 60Co and 252Cf sources were obtained reported, such as zero-crossing (ZC) [6-8], PGA , , and , respectively. The [9], CC [6-8, 9-11], frequency gradient analysis Figure of Merit (FoM) values of CC method were – for the range of energy 50–1000 keVee (FGA) [5], TCT [12], discrete Fourier transform (keV electron equivalent). (DFT) [13], CPR [14], etc. Among them, the CC Keywords—EJ-301 liquid scintillator, fast and ZC algorithms are commonly implemented, neutron detector, pulse shape discrimination therefore they have become the industrial standards which are used to compare with new 1 INTRODUCTION discrimination algorithms [5, 6]. N eutron .
