Vertical profiles and enrichment pattern of natural radionuclides in monazite areas of coastal Kerala

The effects of physicochemical properties on gamma emitting natural radionuclide levels in the soil profile of Istanbul

“…4). Natural radioactivity increased with decreasing particle size and increasing surface area similar to findings of other investigations (Elejalde et al 1993;Baeza et al 1995;De Jong et al 1994;Navas et al 2002;Shetty et al 2006). In these investigations, strong positive correlations were found between natural radionuclide levels and clay or silt content, whereas a strong negative correlations for sand was found in accordance with the results of this study.…”

“…Nevertheless, weathering, sedimentation, leaching, sorption process, and the movement of groundwater may influence activity levels of natural radionuclides (Dowdall and O'Dea 2002;Fujiyoshi and Sawamura 2004). Specific areas of the world have relatively high background radiation levels because of the several times higher naturally occurring terrestrial radionuclides (Roser and Cullen 1964;Yang et al 2005;Merdanoglu and Altinsoy 2006).…”

Background radiation and individual dosimetry in the costal area of Tamil Nadu, India

“…The maximum radioactivity was 43.70 Bq/g by Th-228 collected from the spot-3, which was comparable to the result in Kerala by Shetty et al who reported that the radioactivity of Th-232 and Ra-226, as evaluated from the 2614 keV gamma line of Tl-208 for Th-232 and 1764 keV of Bi-214 for Ra-226, was within the range of 0.01 to 136.81 Bq/g and 0.03 to 10.31 Bq/g, respectively (2) . This study was the first to apply the RPL technology to indoor and individual dose assessment in HBRA.…”

“…The radionuclides-containing monazite sands are deposited along the coast, which are supposed to come from the sea and, in some cases, from the rocks of the interior hinderlands via transportation by rivers. In the costal region of Kerala, several physical, epidemiological, and biological studies have been conducted, including the analysis of the distribution and enrichment pattern of radionuclides (2) , assessment of individual exposure dose (3) , estimation of cancer risk (3) , and heritable effects on the newborns (4) . In Tamil Nadu, outdoor or indoor radiation doses in a part of costal area (5) as well as around the nuclear power plant site (6)(7)(8)(9) have been already reported; however, the analysis of radionuclides and individual dose assessment in HBRA have not been carried out.…”

Laboratory Enrichment of Radioactive Assemblages and Estimation of Thorium and Uranium Radioactivity in Fractions Separated from Placer Sands in Southeast Bangladesh

“…Compared to previous studies, recent researchers mostly focused on the radioactivity levels in heavy mineral rich beach sands (e.g., Kannan et al 2002;Ramasamy et al 2004;Mohanty et al 2004b;Veiga et al 2006;Lu and Zhang 2008;Arnedo et al 2013;Mahawatte and Fernando 2013;Gandhi et al 2014), radiological impacts on human health (Mohanty 2004b;Alencar and Freitas 2005;Righi et al 2005;Haridasan et al 2006), presence of naturally occurring radioactive materials (NORM) in beach sands (Pillai 2007;Malain et al 2010), distribution patterns of natural radionuclides gammaray activities (Seddeeka et al 2005;Veiga et al 2006;Shetty et al 2006;Singh et al 2007), radioactivity enrichment patterns in beach sands (de Meijer et al 2001), and so on. Almost all of the studies were carried out either by measuring activity concentration using different detectors in laboratory without purifying the minerals or by in situ radiation monitoring (Alencar and Freitas 2005).…”