The Specification of Treatment Conditions and Source Requirements for Cobalt 60 Therapy Units

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Abstract
The criteria for the choice of source size and radiation conditions for a 60Co therapy unit are considered. It is concluded that the S.S.D. should be between the limits 60 to 80 cm with a dose-rate of 50 to 150 rads/min. The effect of source dimensions on penumbra and of self absorption loss on source efficiency with practicable specific activities are discussed, and suggestions made for an optimum source suitable for use in three successive types of unit as the activity falls.