A Systematic Review of Radon Investigations Related to Public Exposure in Iran

BACKGROUND The main sources of radiation exposure of all living organisms including humans are natural. In fact, radon and its decay products are the cause of 50% of the total dose that is derived from natural sources. Because of the significant health hazards of radon gas, its levels are widely monitored throughout the world. Accordingly, considerable researches have also been carried out in Iran. OBJECTIVES The aim of this research is a systematic review of the most recent studies associated with evaluation of radon gas levels in Iran. The main emphasis of this study was on public exposure to radon gas. MATERIALS AND METHODS The most important route of exposure to such radiation is indoor places. In this investigation measurement of radon in water resources, tap water, indoor places and exhalation of radon from building material, the major sources of indoor radon gas emission, were considered. RESULTS Significantly high levels of radon gas were found mostly in water and residenvial buildings. CONCLUSIONS It conclusion with regard to the study of building materials, granite stone and adobe coverings cannot be recommended for construction purposes.