![]() ![]() By using these quantities as a starting point, problems at shallow depths related to the influence of contaminating electrons in the beam can be eliminated. However, the current philosophy in dose calculational methods is based on quantities defined at a reference depth, d(ref) = 10 cm, on a separation of phantom and head scatter, and on the use of the relative depth-dose or tissue-phantom ratios normalized at d(ref). The tables were generated for use in dose calculations, with relative beam data such as PDD, BSF, PSF, all with d(max) as the reference depth. A revised version of the supplement was published recently, with a more elaborate discussion, but without changes in data given in these tables (Br. The use of the British Journal of Radiology (BJR) (supplement 17) tables of equivalent square fields for dose calculations is widespread.
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