Some Radiological Applications of Gamma-Ray Transport Theory

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Abstract
Gammaray transport theory is applied to the calculation of energy dissipation in bounded water media under conditions approximating those found in radiological problems. A combination of analytical, numerical, and Monte Carlo techniques is used. Two typical situations are considered: (1) a medium in which an isotropic source of radiation is distributed; (2) a medium irradiated by an external beam of radiation. The spatial pattern of energy dissipation is worked out in detail for a source emitting 1.28-Mev photons. The results of problem 2 are applied to the calculation of the depth dose produced by the irradiation of a medium with Co60 beams with cross-sectional areas up to 400 cm2. The calculated depth-dose distributions are in good agreement with experimental distributions obtained by Johns and his collaborators.
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