Abstract
Radiation measurements were made to support radiation protection decisions and instructions concerning the release of patients receiving I-131 treatment in Sudan. In hyperthyroidism, administered activity ranged from 370 to 1110 MBq (average: 817.8 MBq), and air-absorbed dose rate at 1 m in front of the patients varied from 20 to 66 mu Gy h(-1) (average: 47.0 mu Gy h(-1)). For thyroid cancer patients, the administered activity ranged from 3700 to 7400 MBq (average: 4816.2 MBq), and the air-absorbed dose rate at 1 m in front of the patients ranged from 3 to 55 mu Sv h(-1) (average: 19.2 mu Sv h(-1)). On average, the contamination activity was highest in the patients' clothes: 11.0 Bq cm(-2), followed by the toilet: 6.6 Bq cm(-2) and the front bed: 2.9 Bq cm(-2). The estimated release times from the confinement were well with the radiation safety criteria, whereas instruction are given concerning precaution times to limit radiation exposure to family members and co-worker.