10 MV x-ray SMRs obtained using zero-area correction factors derived by means of the Bjärngard - Petti method

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Abstract
Based on the Khan concept, a new set of 10 MV x-ray scatter - maximum ratios (SMRs) has been produced. These new SMRs reflect no electron contamination and are parametrized. A method has been developed for determining the minimum field size with lateral CPE (charged particle equilibrium) at the field centre. It is found that for 10 MV x-rays the minimum square field with lateral CPE at large depths on the central axis in water is . The zero-area phantom scatter correction factor is derived using the Bjärngard - Petti method. It is found that the effect of electron contamination is to reduce the zero-area correction factor.