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Radiation Protection Dosimetry Advance Access originally published online on December 15, 2007
Radiation Protection Dosimetry 2008 130(2):133-140; doi:10.1093/rpd/ncm486
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Comparison of measured and calculated spatial dose distributions for a bench-mark 106Ru/106Rh hot particle source

A. Sh. Aydarous1,*, M. W. Charles2 and P. J. Darley2

1 Physics Department, Faculty of Science, Taif University, Al-Hawiah, PO Box 888, Taif, Kingdom of Saudi Arabia
2 School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK

* Corresponding author: aydarous{at}hotmail.com

Received August 13, 2007, amended November 1, 2007, accepted November 7, 2007

This study is a part of a programme of research to provide validated dose measurement and calculation techniques for beta emitting hot particles by the construction of well-defined model hot particle sources. This enables parallel measurements and calculations to be critically compared. This particular study concentrates on the high-energy beta emitter, 106Ru/106Rh (Emax = 3.54 MeV). This source is a common constituent of failed nuclear fuel, particularly in accident situations. The depth dose distributions were measured using radiochromic dye film (RDF); an imaging photon detector coupled to an LiF thermoluminescent dosemeter (LiF-IPD) and an extrapolation ionisation chamber (ECH). Dose calculations were performed using the Monte Carlo radiation transport code MCNP4C. Doses were measured and calculated as average values over various areas and depths. Of particular interest are the doses at depths of 7 and 30–50 mg cm–2, and averaged over an area of 1 cm2, as recommended by the International Commission on Radiological Protection for use in routine and accidental over-exposures of the skin. In this case, the average ratios (MCNP/measurement) for RDF, ECH and LiF-IPD were 1.07 ± 0.02, 1.02 ± 0.01 and 0.83 ± 0.16, respectively. There are significantly greater discrepancies between the ECH and LiF-IPD measurement techniques and calculations—particularly for shallow depths and small averaging areas.


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