Journal Article

Natural radioactivity measurements in beach-rock samples of south-east coast of Tamilnadu, India

V. Ramasamy, M. Dheenathayalu, R. Ravisankar, V. Ponnusamy, G. Victor Rajamanickkam, DajKumar Sahayam, V. Meenakshisundram and V. Gajendran

in Radiation Protection Dosimetry

Volume 111, issue 2, pages 229-235
Published in print September 2004 | ISSN: 0144-8420
Published online July 2004 | e-ISSN: 1742-3406 | DOI: https://dx.doi.org/10.1093/rpd/nch328
Natural radioactivity measurements in beach-rock samples of south-east coast of Tamilnadu, India

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The concentration of primordial radionuclides in beach-rock samples of the south-east coast of Tamilnadu, India has been measured using gamma ray spectrum of rock. The mean activities of 232Th, 238U and 40K are 144.18, 29.25 and 267.48 Bq kg−1 respectively. In situ measurements were also carried out using environmental radiation dosemeter. The linear correlation coefficient was obtained. The average activity of concentration of 232Th in the present study is 2.5 times higher than the world median value while the activity of 238U and 40K were found to be lower. This may be due to the heavy minerals present in the study area. In the present study, the calculated activity ratio (Th/U) is higher than the crustal rocks. This may be due to changes in the crustal composition through time (mafic to felsic) that are reflected by a change in the Th and U abundances in sedimentary rocks, and also increase in carbon content with time resulted in the decrease in U content and increase in Th/U ratio.

Journal Article.  2968 words.  Illustrated.

Subjects: Nuclear Chemistry, Photochemistry, and Radiation

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