[The dosage for tangential pendulum irradiation of the thoracic wall using 60Co in surgically treated cancer of the breast and the irradiation of the parasternal lymph nodes (author's transl)].

The determination of the dose to the patient during excentric pendulum irradiation of the thoracic wall is described. The dose delivered in the course of irradiation is simultaneously measured at the patient's surface, using a measuring system with LiF-rods which was especially developed for this purpose. The value obtained has to be multiplied with a correction factor FK=0.96 in order to yield the maximum dose, being located at a depth of 2.5 mm below the skin. The accuracy of this method for determination of doses is discussed, and the deviations are shown not to exceed 5 or 6% of the total dose. The dosage by means of tube chamber measurement is represented as an alternative method. The parasternal lymph nodes are irradiated, in addition to the dose from pendulum irradiation, with a fixed field and employing a lead wedge, both lymphatic chains thus receiving a homogeneous dose.