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Radiation Protection Dosimetry Advance Access originally published online on October 20, 2007
Radiation Protection Dosimetry 2008 128(1):21-35; doi:10.1093/rpd/ncm238
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The MCNP-4C2 design of a two element photon/electron dosemeter that uses magnesium/copper/phosphorus doped lithium fluoride

J. S. Eakins1,*, D. T. Bartlett1, L. G. Hager1, C. Molinos-Solsona2 and R. J. Tanner1

1 Health Protection Agency, Centre for Radiation, Chemical and Environmental Hazards, Chilton, Didcot, Oxon OX11 0RQ, UK
2 Formerly at National Radiological Protection Board, Chilton, Didcot, Oxon OX11 0RQ, UK

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

Received November 10, 2006, amended April 5, 2007, accepted April 6, 2007

The Health Protection Agency is changing from using detectors made from 7LiF:Mg,Ti in its photon/electron personal dosemeters, to 7LiF:Mg,Cu,P. Specifically, the Harshaw TLD-700H card is to be adopted. As a consequence of this change, the dosemeter holder is also being modified not only to accommodate the shape of the new card, but also to optimize the photon and electron response characteristics of the device. This redesign process was achieved using MCNP-4C2 and the kerma approximation, electron range/energy tables with additional electron transport calculations, and experimental validation, with different potential filters compared; the optimum filter studied was a polytetrafluoroethylene disc of diameter 18 mm and thickness 4.3 mm. Calculated relative response characteristics at different angles of incidence and energies between 16 and 6174 keV are presented for this new dosemeter configuration and compared with measured type-test results. A new estimate for the energy-dependent relative light conversion efficiency appropriate to the 7LiF:Mg,Cu,P was also derived for determining the correct dosemeter response.


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