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Calculation by computer of dose distributions for superficial gold-198 implants and the derivation of optimized distribution rules

Department of Medical Physics, Charing Cross Hospital

A computer program has been written which provides two-dimensional visualization of the radiation dose distributions in the treatment surfaces around single-plane gold seed implants. The program was modified in order to investigate the uniformity of dose resulting from various patterns of seed arrangements, and, for a number of sizes of circular implants, practical loading schemes to produce minimum dose variations have been tabulated. Comparisons are made between dose distributions obtained from application of the derived data and those arising from application of the Paterson-Parker rules.

^* Copies of the program are available on request from the author at the above address.

Received for publication July 1, 1975. Revision received November 1, 1975.