(226)Ra, (232)Th and (40)K contents and radon exhalation rate from materials used for construction and decoration in Cameroon

Journal of Radiological Protection : Official Journal of the Society for Radiological Protection
M NgachinL Lagos

Abstract

This work deals with the measurement of radioactivity and radon exhalation rate from building materials manufactured in Douala city from geological materials. Nine types of building material were surveyed for their natural radioactivity contents using high-resolution gamma-ray spectrometry. The activity concentrations for (226)Ra, (232)Th and (40)K varied from 11.5 to 49 Bq kg(-1), 16 to 37 Bq kg(-1) and 306 to 774 Bq kg(-1), respectively. The absorbed dose rate in the samples investigated at 1 m above ground level ranged from 28.5 to 66.6 nGy h(-1). External and internal hazard indices were also estimated as defined by the European Commission. The Ra equivalents of the materials studied ranged from 57.5 to 133 Bq kg(-1) and are much smaller than the recommended limit of 370 Bq kg(-1) for construction materials for dwellings. Polycarbonate nuclear track detectors (NTDs), type CR-39, were used for measuring the radon concentration from different materials. In fact, knowledge of the radon exhalation rate from building materials is important for understanding the individual contribution of each material to the total indoor radon exposure. Samples were hermetically closed in glass vessels and the radon growth was followed as a func...Continue Reading

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Citations

Aug 27, 2009·Journal of Exposure Science & Environmental Epidemiology·Joseph G AllenDavid L Macintosh
Mar 26, 2011·Radiation Protection Dosimetry·Kamal K Ali
Nov 20, 2009·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·M E Emirhan, C S Ozben
Jan 9, 2013·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·J G AllenJ F McCarthy

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