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Radiation Protection Dosimetry Advance Access originally published online on March 3, 2007
Radiation Protection Dosimetry 2007 125(1-4):153-156; doi:10.1093/rpd/ncm183
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Monte Carlo study of a 60Co calibration field of the Dosimetry Laboratory Seibersdorf

C. Hranitzky* and H. Stadtmann

Health Physics Division, ARC Seibersdorf research GmbH 2444 Seibersdorf, Austria

*Corresponding author: christian.hranitzky{at}arcs.ac.at

The gamma radiation fields of the reference irradiation facility of the Dosimetry Laboratory Seibersdorf with collimated beam geometry are used for calibrating radiation protection dosemeters. A close-to-reality simulation model of the facility including the complex geometry of a 60Co source was set up using the Monte Carlo code MCNP. The goal of this study is to characterise the radionuclide gamma calibration field and resulting air-kerma distributions inside the measurement hall with a total of 20 m in length. For the whole range of source-detector-distances (SDD) along the central beam axis, simulated and measured relative air-kerma values are within ±0.6%. Influences on the accuracy of the simulation results are investigated, including e.g., source mass density effects or detector volume dependencies. A constant scatter contribution from the lead ring-collimator of ~1% and an increasing scatter contribution from the concrete floor for distances above 7 m are identified, resulting in a total air-kerma scatter contribution below 5%, which is in accordance to the ISO 4037-1 recommendations.


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