Characteristics and time resolutions of two CeBr 3 gamma-ray spectrometers
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ORIGINAL PAPER
Characteristics and time resolutions of two CeBr3 gamma‑ray spectrometers Jianguo Qin1 · Caifeng Lai1 · Jun Xiao1 · Xinxin Lu1 · Tonghua Zhu1 · Rong Liu1 · Bangjiao Ye2 Received: 24 April 2020 / Revised: 6 June 2020 / Accepted: 19 June 2020 © Institute of High Energy Physics, Chinese Academy of Sciences 2020
Abstract Purpose The purpose of this work is to study the pulse shape, energy resolution, non-proportionality of energy response for gamma-rays, and time characteristics of CeBr3 detector. Method The time and energy responses of two C eBr3 detectors were characterized by an analog method and a digital method using a set of standard γ-ray sources. The pulse shape, energy resolution and non-proportionality (nPR) of energy response for γ-rays were characterized using the analog method. For the analog method, the high voltage applied to PMTs, parameters of walk and external delay of constant fraction discriminator were optimized. For the digital method, a CEAN 1729A digitizer with sampling frequency of 2 GS/s and resolution of 11 bit, and a digital constant fraction discrimination technique were used to study the time performance of the two CeBr3 detectors. Then, the coincidence time resolutions of the CeBr3 detectors for the gamma peaks of 22Na and 60Co were measured using the two methods. Results The trise, lifetime τ, tfall for CeBr3 21# and 22# are 11.2 ns, 23.8 ns, 50.2 ns, and 10.4 ns, 26.5 ns, 58.6 ns, respectively. The measured non-proportionality of CeBr3 21# and 22# are 1.08% and 2.22%, respectively. The time resolutions of the two CeBr3 detectors are 244 ± 2 ps and 248 ± 3 ps at the energy peaks of 60Co source, and 336 ± 2 ps and 335 ± 3 ps at 511 keV for the analog and the digital methods. Conclusions The time resolutions obtained by the analog method and the digital method are almost identical. The C eBr3 detector is a good option in the applications such as half-life measurements, ToF-PET and high counting rate conditions. Furthermore, it is a good γ-ray spectrometer owing to the preferable energy resolution and non-internal activity. Keywords Cerium bromide · CeBr3 · Time resolution · Analog and digital method · Non-proportionality
Introduction Recently, some new inorganic scintillators with preferable performance have been produced, such as LaBr3/LaCl3, CeBr3 and elpasolite crystal Cs2LiYCl6:Ce [1–5]. These scintillators are commonly used in γ-ray spectroscopy, nuclear physics research, astronomy and medical imaging, and they play an important role [6–9]. CeBr3 and LaBr3 both are attractive crystals with similar performance. The former promises to be an adequate substitute of the latter in some applications, because it has fast * Jianguo Qin [email protected] 1
Institute of Nuclear Physics and Chemistry, CAEP, P.O. Box 213, Mianyang 621900, China
Department of Modern Physics, University of Science and Technology of China, Heifei 230026, China
2
time response, high photon yield of 68,000 photons/MeV and more competitive price [10]. Practically, the en
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