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Radiation Protection Dosimetry Advance Access originally published online on April 22, 2009
Radiation Protection Dosimetry 2009 134(1):66-71; doi:10.1093/rpd/ncp023
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© The Author 2009. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

On the effect of updated MCNP photon cross section data on the simulated response of the HPA TLD

Jonathan Eakins*

Health Protection Agency, Radiation Protection Division, CRCE, Chilton, Didcot, Oxon OX11 0RQ, UK

* Corresponding author: jonathan.eakins{at}hpa.org.uk

Received September 2, 2008, amended January 26, 2009, accepted February 10, 2009

The relative response of the new Health Protection Agency thermoluminescence dosemeter (TLD) has been calculated for Narrow Series X-ray distribution and 137Cs photon sources using the Monte Carlo code MCNP5, and the results compared with those obtained during its design stage using the predecessor code, MCNP4c2. The results agreed at intermediate energies (~0.1 MeV to 137Cs), but differed at low energies (<0.1 MeV) by up to ~10%. This disparity has been ascribed to differences in the default photon interaction data used by the two codes, and derives ultimately from the effect on absorbed dose of the recent updates to the photoelectric cross sections. The sources of these data have been reviewed.


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