An interactive program to calculate the treatment time for 60Co single beam, opposing beam, and rotational beam radiation therapy.

An interactive computer program for calculating treatment times for 60Co single beam, opposing beam, or rotational beam radiation therapy is described. The program allows the user to enter parameters specific to his machine. Analytic expressions are used to represent the depth dose, backscatter factor, tissue-air ratio, collimator factor, and beam attenuation of a block-carrying tray.