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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.43 [2005] >
IJPAP Vol.43(11) [November 2005] >
| 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
Marble
Radiological hazards
Gamma ray spectrometry |
| Issue Date: | Nov-2005 |
| Publisher: | CSIR |
| IPC Code: | 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. |
| Page(s): | 815-820 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.43(11) [November 2005]
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