Reference levels of natural radioactivity for the beach sands in a Brazilian southeastern coastal region

Alencar, Alexandre Santos de; Freitas, Antônio Carlos de

doi:10.1016/j.radmeas.2004.08.003

Cited by 69 publications

(17 citation statements)

References 9 publications

(11 reference statements)

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“…In Brazil, surveys on the radioactivity in soil were conducted mainly in the areas with high natural background radiation (HBRA), as for example in Poços de Caldas, on the beaches of monazite sand in the Espírito Santo State (Franca, 1963;Roser et al, 1964), and in other specific and restricted areas (Amaral, 1992;Malanca et al, 1993;Amaral and Mazzilli, 1997;Lauria, 1999;Alencar and Freitas, 2005;Santos Júnior et al, 2006;Hiromoto et al, 2007;Umisedo, 2007;Cardoso et al, 2009;Lauria, 2009). However, large-scale systematic surveys on soil radioactivity are not available in Brazil and to date, QRVs for radionuclides were only established in two Brazilian states (Peres, 2007;Peixoto, 2013).…”

Section: Introductionmentioning

confidence: 99%

Baseline and Quality Reference Values for Natural Radionuclides in Soils of Rio de Janeiro State, Brazil

Ribeiro

Lauria

Silva

et al. 2018

Rev. Bras. Ciênc. Solo

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Section: Introductionmentioning

confidence: 99%

Baseline and Quality Reference Values for Natural Radionuclides in Soils of Rio de Janeiro State, Brazil

Ribeiro

Lauria

Silva

et al. 2018

Rev. Bras. Ciênc. Solo

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“…And the natural radioactivity of marine sand depends on the sediment formation and transport processes that were involved; chemical and biochemical interactions influence the distribution patterns of uranium, thorium and their decay products. However, many studies had been carried out on the radionuclide concentrations in sand beaches around the world, such as India [8] [9], Brazil [10] [11], Thailand [12], Egypt [13], Iran [14], and China (Xiamen, [15]) using the gamma ray spectrometry. In spite of the high number of works carried out around the world on the beach sands, there is a lack of studies about radionuclides of offshore sands.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Natural Radioactivity in Marine Sand Deposits from Offshore China

Li¹,

Hu²,

Zhao³

et al. 2017

OJMS

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Natural radioactivity is very important for the assessment of the marine sand property and usability. By using gamma spectrometry, the concentration of the natural radionuclides 226 Ra, 232Th and 40 K have been measured in marine sand deposits from Liaodong Bay (LDB), North Yellow Sea (NYS), Zhoushan area (ZS), Taiwan Shoal (TS) and Pearl River Mouth (PR), offshore China, which are potential marine sand mining areas. The radiation activity equivalent (Raeq), indoor gamma absorbed dose rate (DR), annual effective dose (HR), alpha index (Ia), gamma index (Ig), external radiation hazard index (Hex), internal radiation hazard index (Hin), representative level index (RLI), excess lifetime cancer risk (ELCR) and annual gonadal dose equivalent (AGDE) associated with the natural radionuclides are calculated to assess the radiation hazard of the natural radioactivity in the marine sands offshore China. From the analysis, it is found that these marine sands are safe for the constructions. The Pearson correlation coefficient reveals that the 226 Ra distribution in the marine sands offshore China is controlled by the variation of the 40 K concentration. Principal component analysis (PCA) yields a two-component representation of the entire data from the marine sands, wherein 98.22% of the total variance is explained. Our results provide good baseline data to expand the database of radioactivity of building materials in China and all over the world.

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“…The concentration of these radionuclides depends on the hydrogeological, graphical climate and conditions. The expose of these ionizing radiations is responsible for the total radiation dose to the public (Alencar and Freitas, 2005). The natural radionuclides contributes 87 % of the radiation exposure to the human beings as it depends on the mineralogical properties of the soil, rocks, sediments and the remaining is due to the anthropogenic activities (Kannan et al, 2002, Ghosh, 1978.…”

Section: Introductionmentioning

confidence: 99%

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

Hariprasath¹,

Chitra²,

Jose³

et al. 2016

IJSRES

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Abstract. The specific activity of primordial radionuclides ( 238 U, 232 Th and 40 K) in the sediment sand of different depth-wise samples in Cauvery and Kollidam rivers in Tiruchirappalli district, Tamil Nadu, India, were estimated using NaI (Tl) gamma ray spectrometry. The mean activities of the radionuclides of all the sediments (depth-wise samples) were 10.4 Bq.Kg -1 , 22.65 Bq.Kg -1 and 310 Bq.Kg -1 respectively. The average amount of dose rate was 30.28 nGyh -1 which is less than the value of 55 nGyh -1 proposed by UNSCEAR. The calculated mean value of radium equivalent lie below the recommended limit of 370 Bq.Kg -1 given by OECD. The exhalation rate of radiogenic gases, radon and thoron from the daughter products of the radionuclides were estimated using SRM radon monitor and RAD-7 detector found to be lie within the recommended limits. From the analysis it is suggested that the sediment sands do not pose any radiological significance to the public and can be used for the construction purposes along with other building materials.

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Reference levels of natural radioactivity for the beach sands in a Brazilian southeastern coastal region

Cited by 69 publications

References 9 publications

Baseline and Quality Reference Values for Natural Radionuclides in Soils of Rio de Janeiro State, Brazil

Baseline and Quality Reference Values for Natural Radionuclides in Soils of Rio de Janeiro State, Brazil

Evaluation of Natural Radioactivity in Marine Sand Deposits from Offshore China

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

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