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Radiation Protection Dosimetry Advance Access published online on February 18, 2007
Radiation Protection Dosimetry, doi:10.1093/rpd/ncm162
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Vienna 2005 Special Issue

PHOTON AND NEUTRON DOSE DISCRIMINATION USING LOW PRESSURE PROPORTIONAL COUNTERS WITH GRAPHITE AND A150 WALLS

J. Kyllönen 1 * and L. Lindborg 1

1 Swedish Radiation Protection Authority, SE-171 16 Stockholm, Sweden

* To whom correspondence should be addressed.
J. Kyllönen, E-mail: jan.erik.kyllonen{at}ssi.se


  Abstract

A graphite-walled proportional counter with low neutron sensitivity was used in combination with a tissue-equivalent proportional counter (TEPC) to separate the photon and neutron components in mixed radiation fields. Monte Carlo (MCNP4C) simulations of the photon and neutron responses of the two detectors were done to obtain correction factors for the sensitivity differences. In an alternative method the radiation components were determined using constant-yD-values for typical photon and neutron energy distributions. The results show no significant difference between the two methods and the measured neutron dose-equivalent agrees within ±50% with Bonner sphere determined values. The experimental data were obtained in measurement campaigns organised within the EVIDOS-project.


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