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Radon Introduction Radon is an element that occurs in a radioactive decay chain that starts with the decay of Uranium to Thorium and ends with a stable isotope of lood. Uranium and with that Radon is present in low concentrations in nature and with that one also encounters it in building materials. Since Radon is a gas at room temperature, it is continually escaping from these building materials. At well-ventilated locations this is of little relevance but in at locations where ventilation is insufficient this may lead to relatively high concentrations of Radon. Generally concentrations of Radon are expressed in [Bq.m-3]. The WHO (World Health Organization) recommends to maintain levels below the 200 [Bq.m-3]. Theory Detection Efficiency Calculation of Flux from growth-curves Experimental Design and Measurement Procedure Signal Processing and Data Analysis Example Complications Suggestions Teachers Section Literature