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Title: Evaluation of natural radioactivity and radiological hazards caused by different marbles of India
Authors: Ramasamy, V
Ponnusamy, V
Hemalatha, J
Meenakshisundaram, V
Gajendiran, V
Keywords: Natural radioactivity
Radiological hazards
Gamma ray spectrometry
Issue Date: Nov-2005
Publisher: CSIR
Series/Report no.: G01T
Abstract: The samples used in this study are of various coloured varieties of marbles collected from marble dealers. The specific activity concentration of  238U, 232Th and 40K has been determined by gamma ray spectrometry. The materials showed concentrations of  238U, 232Th and 40K which were found to be dramatically variable depending on mineral content and type of formation. Using FTIR and thin section analyses, quartz, feldspar, calcite and mafic minerals present in the samples have been determined quantitatively. From our experimental data, it can be seen that the geochemical parameters such as SiO2 or mafic minerals or CaCO3 may be considered to be an appropriate index to select the marbles of low radiological risk. The average specific activities of 40K are found to be higher than 232Th and 238U. The ratio of Th/U was calculated and correlated. Assessment of radiological hazards was made by calculating radium equivalent activities, external and internal hazard indices which were found to vary from 30.92 to 54.45, 0.08 to 0.14 and 0.10 to 0.17 Bq/kg, respectively. The observed values are lower than the recommended limits.
Description: 815-820
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.43(11) [November 2005]

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