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Environmental Earth Sciences

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01.04.2015 | Original Article

In situ gamma source radioactivity measurement in Isparta plain, Turkey

verfasst von: Umit Yalcin Kalyoncuoglu

Erschienen in: Environmental Earth Sciences | Ausgabe 7/2015

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Abstract

Results derived from in situ gamma-ray spectrometry studies on geological units of the Isparta plain, situated in the foothills of the Gölcük volcano, are presented in this study. Determination of the natural radioactivity and radionuclide concentration has been carried out using 512 channel thallium-activated sodium iodide [NaI(TI)] gamma-ray detectors with crystal size 2″ × 2″ produced from GF Instrument Inc. Measurements were performed on 341 site covering volcanic and non-volcanic geological units in the area approximately 256 km². From the measured gamma-ray spectra, high activity concentration (⁴⁰K, ²³⁸U, ²³²Th) and air absorbed dose rates were found to be about 1,959.38, 443.48, 408.63 Bq/kg and 526 nGy/h in the volcanic units. In the residential area and its vicinity, average concentration value of ⁴⁰K, ²³⁸U, ²³²Th and absorbed dose rates were determined as about 1,387.63, 239.16, 234.34 Bq/kg and 350 nGy/h, respectively. Annual effective dose was found as 429.53 μSv/year in this area while annual effective doses were varying from 208 to 522.80 μSv/year in the study area. Contribution (in %) to the background radioactivity level emanated from about 17.58 % ⁴⁰K, 35.73 % ²³⁸U, 46.69 % ²³²Th in volcanic and materials composed of volcanic units.

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Titel: In situ gamma source radioactivity measurement in Isparta plain, Turkey
verfasst von: Umit Yalcin Kalyoncuoglu
Publikationsdatum: 01.04.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: Environmental Earth Sciences / Ausgabe 7/2015
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-014-3610-1

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