[Radiation safety program at the Chang Gung Memorial Hospital]

There are many areas in several departments where radiation-producing facilities are routinely used for diagnosis and therapy in Chang Gung Memorial Hospital. We used RD-8 Wallac survey meters to survey the surroundings of controlled and noncontrolled areas. The results of the survey showed background level in the noncontrolled areas and under 0.2 mR/hr in the controlled areas. In diagnostic fluoroscopy, the worker wore 0.5mm lead apron and received an exposure under 0.5 mR/hr. The operator of the portable X-ray machine was exposed to an exposure of background level when he was 4.5 meter from target and wore a 0.5mm lead apron. The patients in the nuclear medicine department were given 15m Ci Tc-99m for bone scan and the exposure rate was under 0.5 mR/hr at 1.0 meter from the patient. The patient loaded with 55 mCi of Cs-137 for brachytherapy produced exposure rate of 1.5 mR/hr behind lead shielding placed beside the patient bed, and the surroundings outside the room was at background level. We also checked the execution and enforcement of the radiation safety regulations which was found to have met the requirements of the Atomic Energy Council.