Turkish Atomic Energy Authority TAEA

Ankara, Turkey

Turkish Atomic Energy Authority TAEA

Ankara, Turkey
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Turhan S,University of Nevsehir | Arikan I.H.,Turkish Atomic Energy Authority TAEA | Demirel H.,Turkish Atomic Energy Authority TAEA | Gungor N.,Cekmece Nuclear Research and Training Center
Radiation Physics and Chemistry | Year: 2011

This study presents the findings of radiometric analysis carried out to determine the activity concentrations of natural radionuclides in raw materials (clay, kaolin, quartz, feldspar, dolomite, alumina, bauxite, zirconium minerals, red mud and frit) and end products (glazed ceramic wall and floor tiles) in the Turkish ceramics industry. Hundred forty-six samples were obtained from various manufacturers and suppliers throughout the country and analyzed using gamma-ray spectrometer with HPGe detectors. Radiological parameters such as radium equivalent activity, activity concentration index and alpha index were calculated to assess the radiological aspects of the use of the ceramic end products as decorative or covering materials in construction sector. Results obtained were examined in the light of the relevant national and international legislation and guidance and compared with the results of similar studies reported in different countries. The results suggest that the use of ceramic end product samples examined in the construction of dwellings, workplaces and industrial buildings in Turkey is unlikely to give rise to any significant radiation exposure to the occupants. © 2011 Elsevier Ltd.


Turhan S.,University of Nevsehir | Arikan I.H.,Turkish Atomic Energy Authority TAEA | Kose A.,Cekmece Nuclear Research and Training Center | Varinlioglu A.,Cekmece Nuclear Research and Training Center
Environmental Monitoring and Assessment | Year: 2011

The purpose of this study is to assess potential radiological impacts of utilizing pulverized fly ash (PFA) as a constituent in ordinary Portland cement. For this purpose, the activity concentrations of 226Ra, 232Th, and 40K in samples of PFA and Portland cement containing 15%, 20%, and 25% by mass PFA were measured using gamma-ray spectrometry with HPGe detector. The mean activity concentrations of 226Ra, 232Th, and 40K were found as 366.6, 113.7, and 460.2 Bq kg -1, 94.2, 25.9, and 215.3 Bq kg -1, 113.7, 34.3, and 238.3 Bq kg -1, and 124.2, 41.8, and 279.3 Bq kg -1 for the examined samples of PFA, Portland cement with 15%, 20%, and 25% by mass PFA, respectively. Radiological parameters such as radium equivalent activity, external exposure index (activity concentration index), internal dose index (alpha index), indoor absorbed gamma dose rate, and the corresponding the annually effective dose were assessed for Portland cement samples containing three percentages (15%, 20%, and 25%) by mass PFA. The results of assessment show that all Portland cement samples are within the safe limits recommended for building materials for dwellings. © 2010 Springer Science+Business Media B.V.


Turhan S.,University of Nevsehir | Arikan I.H.,Turkish Atomic Energy Authority TAEA | Kucukcezzar R.,Cekmece Nuclear Research and Training Center
Indoor and Built Environment | Year: 2011

This study primarily focuses on the assessment of the radiological consequences forthe public from the use of pulverised coal combustion fly ash in construction sector (cement production) and geotechnical applications (embankments road pavement and road stabilisation) in Turkey. The results of the activity measurements made on samples of the fly ash and Portland cement incorporating 10%, 20% and 30% by mass of fly ash are presented. The results of the external and internal indices, indoor absorbed gamma dose rate and the corresponding annual effective dose were assessed for the samples and these were examined by comparison with the national and international standards or regulation criteria given for the indoor exposure. © SAGE Publications 2010.


Turhan S.,Turkish Atomic Energy Authority TAEA | Arikan I.H.,Turkish Atomic Energy Authority TAEA | Yucel B.,Turkish Atomic Energy Authority TAEA | Varinlioglu A.,Cekmece Nuclear Research and Training Center | Kose A.,Cekmece Nuclear Research and Training Center
Fuel | Year: 2010

The aim of this study is to evaluate radiological safety aspects of the utilization of fly ash in concrete manufacturing in the construction industry. The specific activities of 226Ra, 232Th and 40K in one hundred 55 concrete mixture samples incorporating 10, 20 and 30 wt.% of fly ash collected from the 11 coal-fired thermal power plants were measured by means of gamma-ray spectrometry with HPGe detector. The results of the measurement were used to evaluate the radiological safety aspects of utilization of the fly ash as cement replacement in concrete by assessing the radium equivalent activity, the gamma index, the absorbed gamma dose rate and the corresponding annual effective dose due to the external exposure in indoor. The results of evaluation show that all concrete mixture samples are within the recommended safety limits except for concrete mixture samples incorporating 30 wt.% fly ash of Kangal coal-fired thermal power plant. © 2010 Elsevier Ltd. All rights reserved.


Yucel H.,Turkish Atomic Energy Authority TAEA | Yucel H.,Ankara University | Solmaz A.N.,Ankara University | Kose E.,Ankara University | Bor D.,Ankara University
Journal of Radioanalytical and Nuclear Chemistry | Year: 2010

In this paper, a semi-empirical method is proposed to determine true coincidence-summing (TCS) correction factors for high resolution γ-ray spectrometry. It needs the knowledge of both full energy peak (FEP) efficiency and total-to-peak (TTP) efficiency curves. The TTP efficiency curve is established from the measurements with a set of coincidence-free point sources. Whereas for a volume source, the coincidence-free FEP efficiency curve is obtained iteratively by using the peaks from almost the coincidence-free nuclides and those from the coincident nuclides in the mixed standard sources. Then the fitting parameters obtained for both TTP and FEP efficiency curves are combined in a freely-available TCS calculation program called TrueCoinc, which yields the TCS correction factors required for any nuclide. As an application, the TCS correction factors were determined for the particular peaks of 238U, 226Ra and 232Th in the reference materials, measured in the case of a close-in detection geometry using a well-type Ge detector. The present TCS correction method can be applied without difficulty to all Ge detectors for any coincident nuclide. © 2009 Akadémiai Kiadó, Budapest, Hungary.


Turhan S.,Turkish Atomic Energy Authority TAEA
Radiation Protection Dosimetry | Year: 2010

The natural radionuclide contents of limestone and gypsum samples used as building raw materials in Turkey were measured by means of gamma spectrometer system with HPGe detector. The measured activity concentrations of 226Ra, 232Th and 40K radionuclide were compared with the reported data from other countries. Radium equivalent activity and internal hazard index, absorbed gamma dose rate in indoor due to the external exposure and corresponding annual effective dose were determined to estimate the exposure risk arising due to the use of these raw materials. This study has shown that examined gypsum and limestone raw materials do not pose any excess radiological health problem and are safe for use in the construction of buildings. © The Author 2010. Published by Oxford University Press.

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