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Title: Organic Scintillator for Real-Time Neutron Dosimetry

We have developed a radiation detector based on an organic scintillator for spectrometry and dosimetry of out-of-field secondary neutrons from clinical proton beams. The detector consists of an EJ-299-34 crystalline organic scintillator, coupled by fiber optic cable to a silicon photomultiplier (SiPM). Proof of concept measurements were taken with 137Cs and 252Cf, and corresponding simulations were performed in MCNPX-PoliMi. Despite its small size, the detector is able to discriminate between neutron and gamma-rays via pulse shape discrimination. We simulated the response function of the detector to monoenergetic neutrons in the 100 keV–0 MeV range using MCNPX-PoliMi. The measured unfolded 252Cf neutron spectrum is in good agreement with the theoretical Watt fission spectrum. We determined the ambient dose equivalent by folding the spectrum with the fluence-to-ambient dose conversion coefficient, with a 1.4% deviation from theory. Some preliminary proton beam experiments were preformed at the Bronowice Cyclotron Center patient treatment facility using a clinically relevant proton pencil beam for brain tumor and craino-spinal treatment directed at a child phantom.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [2] ;  [2] ;  [1] ;  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Nuclear Engineering and Radiological Sciences
  2. Polish Academy of Sciences (PAS), Krakow (Poland). Henryk Niewodniczanski Inst. of Nuclear Physics
  3. Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, Poland
Publication Date:
Grant/Contract Number:
NA0002534; G019737
Type:
Accepted Manuscript
Journal Name:
Radiation Protection Dosimetry
Additional Journal Information:
Journal Volume: 180; Journal Issue: 1-4; Journal ID: ISSN 0144-8420
Publisher:
Oxford University Press
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)
Country of Publication:
United States
Language:
English
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
OSTI Identifier:
1454834

Beyer, Kyle A., Di Fulvio, Angela, Stolarczyk, Liliana, Parol, Wiktor, Moj?eszek, Natalia, Kopec, Renata, Clarke, Shaun D., and Pozzi, Sara A.. Organic Scintillator for Real-Time Neutron Dosimetry. United States: N. p., Web. doi:10.1093/rpd/ncx255.
Beyer, Kyle A., Di Fulvio, Angela, Stolarczyk, Liliana, Parol, Wiktor, Moj?eszek, Natalia, Kopec, Renata, Clarke, Shaun D., & Pozzi, Sara A.. Organic Scintillator for Real-Time Neutron Dosimetry. United States. doi:10.1093/rpd/ncx255.
Beyer, Kyle A., Di Fulvio, Angela, Stolarczyk, Liliana, Parol, Wiktor, Moj?eszek, Natalia, Kopec, Renata, Clarke, Shaun D., and Pozzi, Sara A.. 2017. "Organic Scintillator for Real-Time Neutron Dosimetry". United States. doi:10.1093/rpd/ncx255. https://www.osti.gov/servlets/purl/1454834.
@article{osti_1454834,
title = {Organic Scintillator for Real-Time Neutron Dosimetry},
author = {Beyer, Kyle A. and Di Fulvio, Angela and Stolarczyk, Liliana and Parol, Wiktor and Moj?eszek, Natalia and Kopec, Renata and Clarke, Shaun D. and Pozzi, Sara A.},
abstractNote = {We have developed a radiation detector based on an organic scintillator for spectrometry and dosimetry of out-of-field secondary neutrons from clinical proton beams. The detector consists of an EJ-299-34 crystalline organic scintillator, coupled by fiber optic cable to a silicon photomultiplier (SiPM). Proof of concept measurements were taken with 137Cs and 252Cf, and corresponding simulations were performed in MCNPX-PoliMi. Despite its small size, the detector is able to discriminate between neutron and gamma-rays via pulse shape discrimination. We simulated the response function of the detector to monoenergetic neutrons in the 100 keV–0 MeV range using MCNPX-PoliMi. The measured unfolded 252Cf neutron spectrum is in good agreement with the theoretical Watt fission spectrum. We determined the ambient dose equivalent by folding the spectrum with the fluence-to-ambient dose conversion coefficient, with a 1.4% deviation from theory. Some preliminary proton beam experiments were preformed at the Bronowice Cyclotron Center patient treatment facility using a clinically relevant proton pencil beam for brain tumor and craino-spinal treatment directed at a child phantom.},
doi = {10.1093/rpd/ncx255},
journal = {Radiation Protection Dosimetry},
number = 1-4,
volume = 180,
place = {United States},
year = {2017},
month = {11}
}

Works referenced in this record:

A scintillation counter with neutron and gamma-ray discriminators
journal, April 1959