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

Shetty, Pramod K and Narayana, Y and Siddappa, K (2006) Vertical profiles and enrichment pattern of natural radionuclides in monazite areas of coastal Kerala. Journal of Environmental Radioactivity, 86. pp. 132-142. ISSN 0265-931X

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Abstract

Detailed studies on radionuclides concentration in different environmental matrices of high background areas were undertaken in the coastal areas of Karunagapalli, Chavara, Neendakara and Kollam to study the distribution and enrichment of the radionuclides in the region. The sand samples collected at different distances from sea waterline and at different depths, were analysed for primordial radionuclides by gamma spectrometry. The activity of primordial radionuclides was determined for the different size fractions of sand to study the enrichment pattern. The highest activity was found confined in 125e 63 mm particle size fraction in sand. The minimum 232Th activity was 9.4 Bq kg�1, found in Kollam at a depth of 10e20 cm, 40 m away from waterline in 500e250 mm particle size fraction and maximum activity of 136,811.2 Bq kg�1 was observed in Chavara in grains of size 125e63 mm at a depth of 0e10 cm for a sample collected 20 m away from waterline. The lowest 226Ra activity observed was 29.6 Bq kg�1 at Kollam beach for a sample 40 m away from waterline in grains of size 1000e 500 mm and at a depth of 20e30 cm and the highest activity observed was 10,309 Bq kg�1 in grains of size 125e63 mm for a sample collected at a distance 20 m away from waterline and at a depth of 0e10 cm. The activity of 40K was below detectable level in most of the samples collected from the high background monazite area. The 232Th, 226Ra activities decrease with depth for the samples collected 20 m away from the waterline and increase with depth for the samples collected 40 m away from the waterline at Chavara and Kollam beaches. No definite correlation was found between variation of the concentrations of 232Th and 226Ra with depth at Karunagapalli and Neendakara beach sands.

Item Type: Article
Uncontrolled Keywords: High background areas; Natural radionuclides; Thorium; Radium; Environmental
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 13 Sep 2013 06:55
Last Modified: 13 Sep 2013 06:55
URI: http://eprints.manipal.edu/id/eprint/137172

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