Corrected relationship between %dd(10)x and stopping-power ratios

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Abstract
Kosunen and Rogers [Med. Phys. 20, 1181–1188 (1993)] presented a linear equation relating the Spencer–Attix water/air stopping power ratio to the photon component of the percentage depth‐dose at 10 cm depth for a field on the surface of a phantom at This relationship has been used to calculate extensive tables of factors for use with dosimetry protocols based on absorbed‐dose calibration factors. Unfortunately, the original paper contained an error which has recently been assessed (Yang et al.). The present paper presents a corrected form of this relationship, viz.: which is based on corrected values of It is shown that despite changes of up to 2% in calculated values of the net effect on calculated values of is less than 0.2%.

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