On the effect of updated MCNP photon cross section data on the simulated response of the HPA TLD.
The relative response of the new Health Protection Agency thermoluminescence dosimeter (TLD) has been calculated for Narrow Series X-ray distribution and (137)Cs 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 (approximately 0.1 MeV to (137)Cs), but differed at low energies (<0.1 MeV) by up to approximately 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.
Eakins
Jonathan
J
Health Protection Agency, Radiation Protection Division, CRCE, Chilton, Didcot, Oxon OX11 0RQ, UK. jonathan.eakins@hpa.org.uk
D003198:Computer Simulation; D006077:Government Agencies; D008962:Models, Theoretical; D009010:Monte Carlo Method; D017785:Photons; D013819:Thermoluminescent Dosimetry