Using thermoluminiscent dosimeters the absorbed dose in the bladder, rectum and thyroid have been
evaluated when 200 cGy was applied to the prostate. The treatment was applied with a 60Co unit.
A water phantom was built and thermoluminiscent dosimeters were located in the position where the
prostate, bladder, rectum and thyroid are located. The therapeutic beam was applied in 4 irradiations at 0, 90, 180 and 2701 with the prostate at the isocenter. The TLDs readouts were used to evaluate the
absorbed dose in each organ. The absorbed doses were used to estimate the effective doses and the
probability of developing secondary malignacies in thyroid, rectum and bladder.