Technical problems of high dose rate intracavitary radiation therapy using remote afterloader

The important factors to use remote afterloading system (RALS) are to calculate the correct radiation dose distribution, to deliver the exact dose to point A, to minimize the radiation injury, and to operate the cycling source with safety and accuracy. Therefore, we need to have excellent method for radiotherapy and perfect system for the safety. The next steps are as follows, (1) Equipment and staff (Radiotherapist, Radiophysicist, Radiotechnologist). (2) Safety care and exposure dose. (3) Training program and educational system from the international point of view. (author)