Internal exposure from building materials exhaling 222Rn and 220Rn as compared to external exposure due to their natural radioactivity content

Measurement of radon exhalation rates from some building materials used in Serbian construction

“…However, they are in a good agreement with the results previously measured in Serbia (using different methods) by [13], with the exception of a few samples with the highest values of radon exhalation rates that were chosen because of their extremely high content of 226 Ra.…”

“…A certain amount of a material was usually placed in a closed chamber and measurement of radon activity concentration in the chamber volume was performed during a certain period of time in order to determine radon exhalation rate. Some authors based their experiments on estimating integral radon concentration during the exposure time of solid state nuclear track detectors [12,13] while others used different active devices for continuous measuring of radon activity concentration [14][15][16].…”

Merits and Demerits of Different Methods for Radon Exhalation Measurements for Building Materials

“…The assumption of proportionality between radium content and the exhalation rate is misleading to some extent since the exhalation rate strongly depends on the emanation coefficient, porosity, permeability, diffusion length and numerous other factors. Thus, the observation of poor correlation between the radium content in building material and the radon exhalation rate is not a surprise [11]. It was indicated that for a very low air exchange rate, of the order of 0.2 h -1 , the internal exposure of exhaling radon could exceed the external exposure coming from 226 Ra [11].…”

“…Thus, the observation of poor correlation between the radium content in building material and the radon exhalation rate is not a surprise [11]. It was indicated that for a very low air exchange rate, of the order of 0.2 h -1 , the internal exposure of exhaling radon could exceed the external exposure coming from 226 Ra [11]. Having in mind the abovementioned, it is not surprising that the issue of radon exhalation rate is becoming more relevant and that there are numerous recent publications on this matter that use various techniques.…”

Depth Wise Radiological Analysis of Sediment Sands in Cauvery and Kollidam Rivers in Tiruchirappalli District, Tamilnadu, India

“…Radon gas gives nearly half of the radiation to the public (Ferlay et al, 2007). The daughter products of radon such as 214 Po and 218 Po produce significant damages to the tissues due to the emission of alpha particles (Predrag Ujic et al, 2010). The effect of indoor radon and its concentration that affects the human beings were estimated by a number of researchers throughout the world (Marcinowski et al, 1994, Bochichhio 2008, Manousakas et al, 2010.…”