Browsing by Author "Ufuktepe Y."

Now showing 1 - 4 of 4

Radiological, geochemical, and mineralogical characterization of natural stones used in Turkey
(2017-09-01) Yapici N.; Gezer F.; Nurlu N.; Turhan S.; Ufuktepe Y.
In the study, radiological, geochemical, and mineralogical characterization of natural stone samples used for covering or ornamental purposes collected from different quarries in Turkey was done using gamma spectrometric technique with high-purity germanium detector, X-ray fluorescence spectroscopic technique, X-ray diffraction technique and thin sections. The mean activity concentrations of226Ra,232Th, and40K were measured in natural stone samples as 28.9, 30.8, and 355.0 Bqkg-1, respectively. The assessment of radiological hazards from utilization of stone samples as covering or ornamental material in building sector was made by estimating activity concentration index, absorbed gamma dose rate and annual effective dose rate. The examined natural stone samples were composed of calcite, dolomite, quartz, orthoclase, albite, biotite, hornblende, oligoclase, olivine and talc.
Radiometric analysis of micas used in many industries and evaluation of radiological hazards
(2021-08-01) Gezer F.; Turhan S.; Ufuktepe Y.
Mica group minerals have been utilized in various industries such as paint, cement, rubber, plastic, paper, automotive, cosmetics, textile, etc. due to their unique electrical, thermal, and mechanical properties. In this study, the radiometric properties of 58 mica samples collected from three quarries operated commercially in Turkey were investigated using gamma-ray spectroscopy with an HPGe detector. The average activity concentrations of 226Ra, 232Th, and 40K analyzed in mica samples were found as 12, 44, and 2763 Bq kg-1, respectively. The radon emanation coefficient and radon mass exhalation rate of mica samples varied from 4 to 22% with an average of 10% and 0.4-5.9 μBq kg-1 s-1 with an average of 2.6 μBq kg-1 s-1, respectively. The radiological hazard caused by the utilization of mica samples as raw materials in the cement and concrete industry was evaluated for adults by calculating the gamma index and annual effective dose due to external exposure indoor. The study results revealed that there are no significant radiological hazards associated with the utilization of mica samples as building raw materials.
Radiometric characterization of zeolite minerals used in many industries and assessment of radiological risks
(2019-10-01) Gezer F.; Turhan; Kurnaz A.; Ufuktepe Y.
Zeolites are important additives materials which are widely used in different industries such as construction, paper, paint, agriculture, textile, and fertilizer. In this study, radiometric characterization of natural zeolite samples collected from four zeolite open quarries in Western Anatolia in Turkey were determined using a gamma-ray spectrometry with high purity germanium detector. The radiological risks due to the use of zeolite samples as raw materials in cement and concrete production was assessed for adult people by estimating activity concentration index and annual effective dose due to external exposure in indoor. Also, annual effective radiation dose in outdoor and the corresponding lifetime cancer risk were estimated for quarry workers. Average activity concentrations of 226Ra, 232Th and 40K measured in seventy-seven zeolite samples were found as 85 ± 4, 129 ± 2 and 1030 ± 24 Bq kg−1, respectively. The radon emanation factor and radon mass exhalation rate of zeolite samples varied from 1 to 9% with an average of 4% and 1.8–15.1 μBq kg−1 s−1 with an average of 7.2 ± 0.3 μBq kg−1 s−1, respectively. The data were compared with criteria or limit values. The results revealed that usage of the examined zeolite samples as building raw materials would not cause any significant radiological risk.
Tritium activity levels in drinking water of Adana, Turkey
(2014-01-01) Gören E.; Turhan S.; Uǧur F.; Gezer F.; Özdemir B.; Ufuktepe Y.
Tritium activity in potable drinking water samples from Adana city were measured using liquid scintillation counting after distillation procedure. The results exposed that the activity concentrations of the tritium measured in one-third of these samples were lower than minimum detectable activity which has a value of 2 Bq/L for counting time of 1,500 min. However, the maximum and mean value of the tritium activity was found to be 9.1 Bq/L (77.3 TU) and 7.0 Bq/l (59.4 TU), respectively. These values were substantially below the 100 Bq/L which is normative limit in Turkey for waters intended for human consumption. The highest values of annual effective dose received by infants, children and adults due to measured tritium activity were estimated as 0.041, 0.057 and 0.120 μSv/y, respectively. © 2014 Akadémiai Kiadó, Budapest, Hungary.