T Palani Selvam et al 2003 Phys. Med. Biol. 48 N139 doi:10.1088/0031-9155/48/11/401
T Palani Selvam, K N Govinda Rajan, P Sethulakshmi and B C Bhatt
Show affiliationsFor accurate evaluation of air-kerma strength, Sk, of 169Yb and 60Co brachytherapy sources, the present study reports Monte Carlo (MC) based corrections for (1) room scatter, and (2) departure from constant room scatter for rooms of various sizes. Correction for exponential attenuation of effective primary in air is also reported for the above sources.
Values of Sk per contained mCi, Sk/Ac, predicted by MC calculations for 169Yb source (model X1267) with and without Ti K x-rays are 1.302 ± 0.03% (this value is in excellent agreement with the published value reported by Piermattei et al) and 1.260 ± 0.03% cGy cm2 h−1 mCi−1 respectively, and in the case of Cathetron 60Co source the value of Sk/Ac is 11.015 ± 0.01% cGy cm2 h−1 mCi−1.
It is observed that depending upon the position of the source with respect to the surrounding concrete scattering surfaces and set of d values, the assumption of constant room scatter has resulted in overestimation of Sk that varied between 0.30% and 1.5% for the 169Yb source and only between 0.10% and 0.20% for the 60Co source.
Issue 11 (7 June 2003)
Received 30 January 2003
Published 20 May 2003
T Palani Selvam et al 2003 Phys. Med. Biol. 48 N139
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