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Environmental Earth Sciences

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01.03.2016 | Original Article

Measurement of natural radioactivity and radiation hazards assessment in rock samples of Ramanagara and Tumkur districts, Karnataka, India

verfasst von: D. R. Rangaswamy, M. C. Srilatha, C. Ningappa, E. Srinivasa, J. Sannappa

Erschienen in: Environmental Earth Sciences | Ausgabe 5/2016

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Abstract

The present study deals with the activity concentration of natural primordial radionuclides, namely ²²⁶Ra, ²³²Th, and ⁴⁰K in different rock samples of Ramanagara and Tumkur districts, and has been studied by using gamma ray spectrometry. The average activity concentration of ²²⁶Ra, ²³²Th, and ⁴⁰K in the collected rock samples was found to be 41.08 ± 2.12, 86.26 ± 2.94, and 869.29 ± 3.78 Bq.kg⁻¹, respectively. The average radium equivalent activity (Ra_eq) was found as 225.29 Bq.kg⁻¹ and these values are well within the recommended limit prescribed for dwellings as 370 Bq.kg⁻¹. The external (H _ex) and internal hazard index (H _in) values are also less than unity. The mean value of absorbed dose rate in rock samples was found as 107.33 nGy.h⁻¹, respectively, and is slightly higher than the worldwide average value. The average indoor and outdoor annual effective dose values for rock samples are 0.526 mSv.y⁻¹ and 0.131 mSv.y⁻¹, respectively. These values are lower than the average world recommended value of 1 mSv.y⁻¹.

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Titel: Measurement of natural radioactivity and radiation hazards assessment in rock samples of Ramanagara and Tumkur districts, Karnataka, India
verfasst von: D. R. Rangaswamy
M. C. Srilatha
C. Ningappa
E. Srinivasa
J. Sannappa
Publikationsdatum: 01.03.2016
Verlag: Springer Berlin Heidelberg
Erschienen in: Environmental Earth Sciences / Ausgabe 5/2016
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-015-5195-8

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