Clinically Useful Calculations of the Dose Distribution from Multiple Radiation Sources

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Abstract
Carcinoma of the cervix is commonly treated by a combination of intracavitary radium and external high-energy x-ray or cobalt-60 gamma radiation. Standard values of dose are essentially preselected, i.e., 6,000 R to Point A in two seventy-two-hour radium applications two weeks apart and 3,000 R by external radiation. More description, however, is not only needed, but is essential to the understanding of what an “ideal” radium application should be and what the actual application will achieve. The radium application is designed to achieve a bell-shaped zone of irradiation by the loadings selected for the tandem and ovoids. Certain values in the determination of dose are predetermined. The total dose to be given by intracavitary radium is known, and the tolerance values for bladder and rectum can be established within limits. Almost any loading in any configuration will produce the standard dose in the three-day application. There is some difficulty in determining where this bell-shaped zone of radiation li...

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