Variation of Radiation level and Radionuclide Enrichment in high background area

Shetty, Pramod K and Narayana, Y (2010) Variation of Radiation level and Radionuclide Enrichment in high background area. Journal of Environmental Radioactivity, 101. pp. 1043-1047.

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Significantly high radiation level and radionuclide concentration along Quilon beach area of coastal Kerala have been reported by several investigators. Detailed gamma radiation level survey was carried out using a portable scintillometer. Detailed studies on radionuclides concentration in different environmental matrices of high background areas were undertaken in the coastal areas of Karunagapalli, Kayankulam, Chavara, Neendakara and Kollam to study the distribution and enrichment of the radionuclides in the region. The absorbed gamma dose rates in air in high background area are in the range 43e17,400 nGyh�1. Gamma radiation level is found to be maximum at a distance of 20 m from the sea waterline in all beaches. The soil samples collected from different locations were analysed for primordial radionuclides by gamma spectrometry. The activity of primordial radionuclides was determined for the different size fractions of soil to study the enrichme nt pattern. The highest activity of 232Th and 226Ra was found to be enriched in 125e63 m size fraction. The preferential accumulation of 40K was found in <63 m fraction. The minimum 232Th activity was 30.2 Bq kg�1 , found in 1000e500 m particle size fraction at Kollam and maximum activity of 3250.4 Bq kg�1 was observed in grains of size 125e63 m at Neendakara. The lowest 226Ra activity observed was 33.9 Bq kg�1 at Neendakara in grains of size 1000e500 m and the highest activity observed was 482.6 Bq kg�1 in grains of size 125e63 m in Neendakara. The highest 40K activity found was 1923 Bq kg�1 in grains of size <63 m for a sample collected from Neendakara. A good correlation was observed between computed dose and measured dose in air. The correlation between 232Th and 226Ra was also moderately high. The results of these investigations are presented and discussed in this paper. � 2010 Elsevier Ltd. All rights reserved.

Item Type: Article
Additional Information: 2010 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords: High radiation level Gamma spectrometry Dose in air Enrichment soil
Subjects: Engineering > MIT Manipal > Physics
Depositing User: Users 72 not found.
Date Deposited: 15 Jul 2011 10:22
Last Modified: 15 Jul 2011 10:22

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