Ambient Gamma Levels in the Seaside Regions of Thangasherry, Kerala

S. Monica¹

Section:Research Paper, Product Type: Isroset-Journal
Vol.6 , Issue.5 , pp.69-74, Oct-2018

CrossRef-DOI:   https://doi.org/10.26438/ijsrpas/v6i5.6974

Online published on Oct 31, 2018

Copyright © S. Monica . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Indoor and outdoor gamma dose rates were evaluated along the coastal regions of Thangasherry, Kollam district, Kerala through direct measurements using a GM based gamma dose survey meter, time integrated measurement using CaSO4:Dy based thermo luminescent dosimeters (TLDs) and gamma spectrometry of soil samples. The mean value of total annual effective dose rate observed were 0.26 ±0.01mSv/yr , respectively with an indoor to outdoor dose ratio of 0.54. The radioactivity content in the soil samples, the absorbed dose rate, annual effective dose equivalent, radium equivalent activity, internal and external hazard indices , the representative gamma index and alpha index (Igamma and Ialpha), the annual gonad dose equivalent (AGDE) and the excess lifetime cancer risk (ELCR) were determined and compared with recommended values. Correlation study showed that the dose estimated from the TLDs is better correlated with that measured directly using the portable survey meter. The results of natural radioactivity levels in the soil samples has been compared with the levels reported in other Indian cities as well as other parts of the world.

Key-Words / Index Term :
Gamma dose, Thermoluminescence, effective dose

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