اندازه گیری و مقایسه غلظت پرتوزایی رادن در ساختمان های با نمای داخلی از سنگ گرانیت و کربناتی

  Based on the last presented reports of UNSCEAR, inhalation of radon gas and its short-lived decay products is a major contributor to the human exposure from natural radioactivity. Lung cancer is the known effect on human health from exposure to radon in air. Radon is found in outdoor air of buildings of all kinds. The main important isotope of radon is 222Rn. Radon (222Rn) is a noble gas produced by radioactive decay of radium (226Ra), which is a decay product of Uranium (238U). Uranium and radium occur naturally in soils and rocks. Radon is found in significant concentrations in the human environment, particularly within indoor air of buildings faced by granite stones as internal decoration. Over the past few decades, natural radiation exposure due to 222Rn and its progeny inside houses has been recognized as a worldwide problem and a cause of significant lung cancer risk to the population . In this study the results of measurement of activity concentration of radon in indoor air of two different buildings which have been used granite and carbonate stones as internal decoration, are presented and compared. Activity concentration of radon was measured by AlphaGuardTM apparatus. The average radon concentrations determined in two different buildings with carbonates and granite stones were 11 and 59 Bq.m-3, respectively. These values are below the radon reference levels which range from 200-600 Bq.m-3 as recommended by ICRP, IAEA, and is lower than US-EPA and WHO action levels 148 and 100 Bq.m-3, respectively.