The Measurements of Dosimetry of Cs -137 Sources with the Fletcher-Suit Applicator

Abstract

Fletcher'Suit applicator was designed with specific purpose for the treatment of carcinoma of the uterine cervix and has been widely used for the intracavitary radiation. In many instances. calculation of dosage distributions about intracavitary applicator doses not require corrections for radiation by applicator. However. in the case of the Fletcher-Suit applicator loaded with cesium in place of radium tubes. correction should be made for absorption by the applicator. So the measurements of transmission ratios has made in polystyrene phantom using PC•12 Computer densitometer. The results show that there is a 10%~30% reduction dose to the region of the hladder trigone and anterior rectu