Abstract
Ionisation chamber measurements in air and in a phantom show that scatter does not quite compensate for attenuation, as assumed in the Paterson-Parker dosage system, for the γ rays from 226Ra + daughters, 198Au, 192 Ir, 182Ta, 137Cs and 60Co. Exposures within the patient are slightly, but not clinically significantly lower than predicted, whilst the increase of surface doses due to back-scatter is also very small. All these isotopes can be used equally well for moulds or implants.
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