Abstract
Using separate analytical functions describing primary dose, P0(dm,r), collimator scatter, Sc(r), and phantom scatter, TAR(d,r), an expression for absorbed dose in narrow 60Co gamma-ray beams is developed and each function is quantified: D(d,r) = P0(dm,r) Sc(r) TAR(d,r). The absorbed dose is calculated in beams as narrow as 0.2 cm in radius. Analytical and experimental results are compared using measured dose data for the Gamma Knife. Close agreement with experimental data is observed.
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