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Title: Interaction position, time, and energy resolution in organic scintillator bars with dual-ended readout

Abstract

We report on the position, timing, and energy resolution of a range of plastic scintillator bars and reflector treatments using dual-ended silicon photomultiplier readout. These measurements are motivated by the upcoming construction of an optically segmented single-volume neutron scatter camera, in which neutron elastic scattering off of hydrogen is used to kinematically reconstruct the location and energy of a neutron-emitting source. For this application, interaction position resolutions of about 10 mm and timing resolutions of about 1 ns are necessary to achieve the desired efficiency for fission-energy neutrons. The results presented here indicate that this is achievable with an array of 5 x 5 x 190 mm3 bars of EJ-204 scintillator wrapped in Teflon tape, read out with SensL’s J-series 6 x 6 mm2 silicon photomultipliers. With two independent setups, we also explore the systematic variability of the position resolution, and show that, in general, using the difference in the pulse arrival time at the two ends is less susceptible to systematic variation than using the log ratio of the charge amplitude of the two ends. Finally, we measure a bias in the absolute time of interactions as a function of position along the bar: the measured interaction time formore » events at the center of the bar is 100 ps later than interactions near the SiPM.« less

Authors:
 [1];  [2];  [1];  [1];  [2];  [2];  [2];  [2];  [2];  [2]
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  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  2. Univ. of Hawaii, Honolulu, HI (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States); Univ. of Hawaii at Manoa, Honolulu, HI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
OSTI Identifier:
1497634
Alternate Identifier(s):
OSTI ID: 1597562; OSTI ID: 1636365
Report Number(s):
SAND-2019-1708J
Journal ID: ISSN 0168-9002; 672631
Grant/Contract Number:  
AC04-94AL85000; SC0010504
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 927; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Sweany, M., Galindo-Tellez, A., Brown, J., Brubaker, E., Dorrill, R., Druetzler, A., Kaneshige, N., Learned, J., Nishimura, K., and Bae, W. Interaction position, time, and energy resolution in organic scintillator bars with dual-ended readout. United States: N. p., 2019. Web. doi:10.1016/j.nima.2019.02.063.
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Sweany, M., Galindo-Tellez, A., Brown, J., Brubaker, E., Dorrill, R., Druetzler, A., Kaneshige, N., Learned, J., Nishimura, K., & Bae, W. Interaction position, time, and energy resolution in organic scintillator bars with dual-ended readout. United States. https://doi.org/10.1016/j.nima.2019.02.063
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Sweany, M., Galindo-Tellez, A., Brown, J., Brubaker, E., Dorrill, R., Druetzler, A., Kaneshige, N., Learned, J., Nishimura, K., and Bae, W. Mon . "Interaction position, time, and energy resolution in organic scintillator bars with dual-ended readout". United States. https://doi.org/10.1016/j.nima.2019.02.063. https://www.osti.gov/servlets/purl/1497634.
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@article{osti_1497634,
title = {Interaction position, time, and energy resolution in organic scintillator bars with dual-ended readout},
author = {Sweany, M. and Galindo-Tellez, A. and Brown, J. and Brubaker, E. and Dorrill, R. and Druetzler, A. and Kaneshige, N. and Learned, J. and Nishimura, K. and Bae, W.},
abstractNote = {We report on the position, timing, and energy resolution of a range of plastic scintillator bars and reflector treatments using dual-ended silicon photomultiplier readout. These measurements are motivated by the upcoming construction of an optically segmented single-volume neutron scatter camera, in which neutron elastic scattering off of hydrogen is used to kinematically reconstruct the location and energy of a neutron-emitting source. For this application, interaction position resolutions of about 10 mm and timing resolutions of about 1 ns are necessary to achieve the desired efficiency for fission-energy neutrons. The results presented here indicate that this is achievable with an array of 5 x 5 x 190 mm3 bars of EJ-204 scintillator wrapped in Teflon tape, read out with SensL’s J-series 6 x 6 mm2 silicon photomultipliers. With two independent setups, we also explore the systematic variability of the position resolution, and show that, in general, using the difference in the pulse arrival time at the two ends is less susceptible to systematic variation than using the log ratio of the charge amplitude of the two ends. Finally, we measure a bias in the absolute time of interactions as a function of position along the bar: the measured interaction time for events at the center of the bar is 100 ps later than interactions near the SiPM.},
doi = {10.1016/j.nima.2019.02.063},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = ,
volume = 927,
place = {United States},
year = {Mon Feb 25 00:00:00 EST 2019},
month = {Mon Feb 25 00:00:00 EST 2019}
}
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https://doi.org/10.1016/j.nima.2019.02.063
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