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Title: Photon dosimetry using plastic scintillators in pulsed radiation fields

Abstract

Simulations and experiments have been carried out to explore using a plastic scintillator as a dosimetry probe in the vicinity of a pulsed bremsstrahlung source in the range 4 to 20 MeV. Taking advantage of the tissue-equivalent properties of this detector in conjunction with the use of a fast digital signal processor near real-time dosimetry was shown to be possible. The importance of accounting for a broad energy electron beam in bremsstrahlung production, and photon scattering and build-up, in correctly interpreting dosimetry results at long stand-off distances is highlighted by comparing real world experiments with ideal geometry simulations. Close agreement was found between absorbed energy calculations based upon spectroscopic techniques and calculations based upon signal integration, showing a ratio between 10 MeV absorbed dose to 12 MeV absorbed dose of 0.66 at a distance of 91.4 m from the accelerator. This is compared with an idealized model simulation with a monoenergetic electron beam and without scattering, where the ratio was 0.46.

Authors:
; ; ;
Publication Date:
Research Org.:
Idaho National Laboratory (INL)
Sponsoring Org.:
USDOE
OSTI Identifier:
912454
Report Number(s):
INL/CON-07-12445
TRN: US0800404
DOE Contract Number:
DE-AC07-99ID-13727
Resource Type:
Conference
Resource Relation:
Conference: SPIE International Defense and Security Symposium,Orlando, FL,04/09/2007,04/13/2007
Country of Publication:
United States
Language:
English
Subject:
46 - INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BREMSSTRAHLUNG; DOSIMETRY; ELECTRON BEAMS; GEOMETRY; PHOTONS; PLASTIC SCINTILLATORS; PROBES; PRODUCTION; RADIATION DOSES; RADIATIONS; SCATTERING; SECURITY; SIMULATION; bremsstrahlung; dosimetry; Plastic scintillator; pulsed radiation

Citation Formats

David L. Chichester, Brandon W. Blackburn, James T. Johnson, and Scott W. Watson. Photon dosimetry using plastic scintillators in pulsed radiation fields. United States: N. p., 2007. Web.
David L. Chichester, Brandon W. Blackburn, James T. Johnson, & Scott W. Watson. Photon dosimetry using plastic scintillators in pulsed radiation fields. United States.
David L. Chichester, Brandon W. Blackburn, James T. Johnson, and Scott W. Watson. Sun . "Photon dosimetry using plastic scintillators in pulsed radiation fields". United States. doi:. https://www.osti.gov/servlets/purl/912454.
@article{osti_912454,
title = {Photon dosimetry using plastic scintillators in pulsed radiation fields},
author = {David L. Chichester and Brandon W. Blackburn and James T. Johnson and Scott W. Watson},
abstractNote = {Simulations and experiments have been carried out to explore using a plastic scintillator as a dosimetry probe in the vicinity of a pulsed bremsstrahlung source in the range 4 to 20 MeV. Taking advantage of the tissue-equivalent properties of this detector in conjunction with the use of a fast digital signal processor near real-time dosimetry was shown to be possible. The importance of accounting for a broad energy electron beam in bremsstrahlung production, and photon scattering and build-up, in correctly interpreting dosimetry results at long stand-off distances is highlighted by comparing real world experiments with ideal geometry simulations. Close agreement was found between absorbed energy calculations based upon spectroscopic techniques and calculations based upon signal integration, showing a ratio between 10 MeV absorbed dose to 12 MeV absorbed dose of 0.66 at a distance of 91.4 m from the accelerator. This is compared with an idealized model simulation with a monoenergetic electron beam and without scattering, where the ratio was 0.46.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}

Conference:
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