Abstract
Radon alpha activity concentration has been measured in 8 public hospitals in the three main governorates: Erbil, Duhok and Sulaymaniya -Iraqi Kurdistan region during two seasons summer and winter by using CR-39 nuclear track detectors. The CR-39 detectors were placed in the all hospitals for three floors (ground, first and second). . The highest average radon concentration was found to be in the Shaheed Dr.Aso hospital (Sulaymaniya) in winter season (131.73±9.42 Bq.m -3 ) , and the lowest was found in the Erbil Teaching hospital (Erbil) in summer season (30.15±2.83 Bq.m -3 ), this depended on the geological formation , type of building material, ventilation rate and the floor level. Therefore, the results showed that the average radon concentration and annual effective dose decreases gradually as the floor level increases. The highest and lowest of annual effective dose was found in ground and second floor, respectively.
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