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• W2412208162 abstract "The BEAMnrc/EGSnrc Monte Carlo code system is employed to develop a model of the National Research Council of Canada primary standard of absorbed dose to tissue in a beta radiation field, comprising an extrapolation chamber and beta source. We benchmark the model against the measured response of the chamber in terms of absorbed dose to air, for three different experimental setups when irradiated by the source. For the first setup, the chamber cavity depth is fixed at and the source-to-chamber distance varied between 11 and . In the other two cases, the source-to-chamber distance is fixed at . In one case the response for different chamber depths is studied, while in the other case the chamber depth is fixed at as different thicknesses of Mylar™ are added to the front surface of the extrapolation chamber. The agreement as a function of distance between the calculated and measured responses is within 0.37% for a variation in response of a factor of 29. In the case of dose versus chamber depth, the agreement is within 0.4% for the ISO-recommended nominal depths of . Agreement between calculated and measured responses is very good (between 0.02% and 0.2%) for added Mylar foils of thicknesses up to . For larger Mylar thicknesses, deviations of 0.6%–1.2% are observed, which are possibly due to the systematic uncertainties associated with the restricted collisional stopping powers of air or Mylar used in the calculations. We conclude that our simulation model represents the extrapolation chamber and source with adequate accuracy to calculate correction factors for accurate realization of dose rate to tissue at a depth of in an ICRU tissue phantom, despite the fact that the uncertainties in the physical characteristics of the source leave some uncertainty in certain calculated quantities." @default.
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• W2412208162 date "2005-09-21" @default.
• W2412208162 modified "2023-09-26" @default.
• W2412208162 title "Monte Carlo modeling of the response of NRC's Sr90∕Y90 primary beta standard" @default.
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• W2412208162 doi "https://doi.org/10.1118/1.1997347" @default.
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