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Title: Measuring the scintillation decay time for different energy deposited by γ-rays and neutrons in a Cs 2 LiYCl 6 :Ce 3+ detector

Abstract

In nuclear safeguards and homeland security applications, it is greatly beneficial to simultaneously detect γ-rays, thermal neutrons, and fast neutrons using a single detector with reasonable pulse shape discrimination capability, energy resolution comparable with or even better than NaI(Tl) detectors, and high detection efficiency. Cs 2LiYCl 6:Ce 3+ detector (CLYC) scintillation detectors have been proven to be one promising candidate to meet these requirements. In this work, the decay time and fraction of each scintillation component for different energy deposition and incident particle type (γ-ray, thermal neutron, and fast neutron) were investigated based on fitting the PMT anode output with exponential functions. For γ-rays, four components were determined with ultrafast decay time of less than one nanosecond and slow time in the order of magnitude of microsecond. It was found that the dependence on the energy deposited by γ-rays of the fraction as well as the decay time of the three slow components was small. However, significant dependence was observed for the ultrafast component. Two or three components were determined for thermal neutrons and fast neutrons without observing a component with fast decay time. To verify the approach used it was first applied to scintillation pulses induced by γ-rays inmore » a NaI(Tl) detector. We found the results were consistent with well-known data already published in the literature.« less

Authors:
 [1];  [1]
  1. Univ. of Florida, Gainesville, FL (United States)
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
OSTI Identifier:
1487101
Grant/Contract Number:  
NA0002534
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 853; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CLYC; decay time; energy deposition; pulse fitting; pulse shape discrimination

Citation Formats

Wen, Xianfei, and Enqvist, Andreas. Measuring the scintillation decay time for different energy deposited by γ-rays and neutrons in a Cs2 LiYCl6 :Ce3+ detector. United States: N. p., 2017. Web. doi:10.1016/j.nima.2017.02.019.
Wen, Xianfei, & Enqvist, Andreas. Measuring the scintillation decay time for different energy deposited by γ-rays and neutrons in a Cs2 LiYCl6 :Ce3+ detector. United States. doi:10.1016/j.nima.2017.02.019.
Wen, Xianfei, and Enqvist, Andreas. Thu . "Measuring the scintillation decay time for different energy deposited by γ-rays and neutrons in a Cs2 LiYCl6 :Ce3+ detector". United States. doi:10.1016/j.nima.2017.02.019. https://www.osti.gov/servlets/purl/1487101.
@article{osti_1487101,
title = {Measuring the scintillation decay time for different energy deposited by γ-rays and neutrons in a Cs2 LiYCl6 :Ce3+ detector},
author = {Wen, Xianfei and Enqvist, Andreas},
abstractNote = {In nuclear safeguards and homeland security applications, it is greatly beneficial to simultaneously detect γ-rays, thermal neutrons, and fast neutrons using a single detector with reasonable pulse shape discrimination capability, energy resolution comparable with or even better than NaI(Tl) detectors, and high detection efficiency. Cs2LiYCl6:Ce3+ detector (CLYC) scintillation detectors have been proven to be one promising candidate to meet these requirements. In this work, the decay time and fraction of each scintillation component for different energy deposition and incident particle type (γ-ray, thermal neutron, and fast neutron) were investigated based on fitting the PMT anode output with exponential functions. For γ-rays, four components were determined with ultrafast decay time of less than one nanosecond and slow time in the order of magnitude of microsecond. It was found that the dependence on the energy deposited by γ-rays of the fraction as well as the decay time of the three slow components was small. However, significant dependence was observed for the ultrafast component. Two or three components were determined for thermal neutrons and fast neutrons without observing a component with fast decay time. To verify the approach used it was first applied to scintillation pulses induced by γ-rays in a NaI(Tl) detector. We found the results were consistent with well-known data already published in the literature.},
doi = {10.1016/j.nima.2017.02.019},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
issn = {0168-9002},
number = C,
volume = 853,
place = {United States},
year = {2017},
month = {2}
}

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Cited by: 4 works
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Figures / Tables:

Fig. 1 Fig. 1: Experimental setup for studying the decay characteristics of the scintillation pulses from the CLYC detector. (a) a picture of the CLYC detector coupled with PMT (high voltage and PMT anode signal cables are also shown); (b) a block diagram showing the experimental setup including detector, high-voltage supply, PMT,more » high-speed digitizer, and PC.« less

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