Monte Carlo modeling of the response of NRC's Sr90∕Y90 primary beta standard

Medical Physics
T Palani SelvamD W O Rogers

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 Sr90∕Y90 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 Sr90∕Y90 source. For the first setup, the chamber cavity depth is fixed at 0.2cm and the source-to-chamber distance varied between 11 and 60cm. In the other two cases, the source-to-chamber distance is fixed at 30cm. In one case the response for different chamber depths is studied, while in the other case the chamber depth is fixed at 0.2cm 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 0.025-0.25cm. Agreement between calculated and measured responses is very good (between 0.02% and 0.2%) for added Mylar foils of th...Continue Reading

References

Mar 1, 1972·Physics in Medicine and Biology·B Owen
May 1, 1995·Medical Physics·D W RogersT R Mackie
Jan 1, 2000·Physics in Medicine and Biology·C M Ma, S B Jiang
Apr 5, 2002·Medical Physics·Daryoush Sheikh-Bagheri, D W O Rogers
Dec 5, 2003·Physics in Medicine and Biology·Frank Verhaegen, Jan Seuntjens

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Citations

May 11, 2015·Radiation Protection Dosimetry·T Palani SelvamD A R Babu

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