|
|
|
 |
Search published articles |
 |
|
Showing 4 results for Keser
Dr. F.k. Görür, R. Keser, N. Akçay, N. As, S. Dizman,
Volume 10, Issue 2 (9-2012)
Abstract
Background: Tea is one of the most popular
beverages all over the world which is prepared from
the leaves of a shrub camellia sinensis. Eastern Black
Sea Region of Turkey which account for around 100%
of all tea production in Turkey was among the areas
contaminated by Chernobyl accident. Materials and
Methods: A comprehensive study was planned and
carried out to determine the level of gross α and β
radioactivity and annual effective dose equivalent in
different Turkish market tea using LSC. Results: The
average measurements for digestion and infusion are
5.0 mBql-1 and 1.8 mBql-1 for gross α, 80.7 mBql-1
and 9.0 mBql-1 for gross β in tea samples. Contributions
of the infusion tea samples to total annual
effective dose equivalent from 238U, 234U, 230Th, 226Ra,
210Po, 232Th, 238Th, 210Pb and 228Ra are 0.103, 0.112,
0.480, 0.640, 2.742, 0.525, 0.164, 7.740 and
7.740 μSvy-1 for adults. Conclusion: The obtained
results showed that natural activity concentrations of
α- and β-emitting radionuclides and annual effective
dose equivalent in tea samples did not exceed WHO
recommended levels. Iran. J. Radiat. Res., 2012 10(2):
67‐72
Dr. R. Keser, F. Korkmaz Görür, İ Alp, N.t. Okumusoğlu,
Volume 11, Issue 3 (7-2013)
Abstract
Background: The radioactivity levels in sediment and rock samples of İkizdere and Kaptanpaşa Valley have been determined. To our knowledge, there seems to be no information about radioactivity level in the İkizdere and Kaptanpaşa Valley sediments and rocks so far. Materials and Methods: The average radium equivalent activity (Raeq), the total absorbed dose rate (D), the external risk index (Hex) and the annual effective dose equivalent (AEDE) which will be defined later have been calculated and compared with the results in literature. Rock characterization was also investigated using thin section and X-ray diffraction (XRD) analysis. Also gross &alpha and &beta activity concentrations were calculated for some rock samples. Results: Their radiological implications were also calculated and compared with the international recommended values. The gross &alpha activity is generally lower than the corresponding gross &beta activity for some rock samples. Rock characterization was also investigated using thin section and XRD analysis. Conclusion: This study can be used as a baseline for future investigations and the data obtained in this study may be useful for natural radioactivity mapping. It seems necessary to determine the radioactivity concentrations in sediments and rock of other parts of Turkey. The results may also be used as a reference data for monitoring possible radioactivity pollutions in future.
S. Dizman, Dr. F.k. Görür, R. Keser,
Volume 14, Issue 3 (7-2016)
Abstract
Background: Turkey, especially the northern part of it, was one of the countries which were contaminated by the Chernobyl accident. Rize is a city located in the Northeastern district of Turkey which was heavily influenced by the Chernobyl nuclear accident. Materials and Methods: In this study, the activity concentrations of natural (226Ra, 232Th, 40K) and artificial (137Cs) were measurements in soil samples collected from 132 different points in Rize province of Turkey using gamma spectrometry with a high-purity germanium detector. Results: The average activity concentrations of 226Ra, 232Th and 40K were found to be 85.75±11.77, 51.08±9.42, and 771.57±37.65 Bq/kg in soil samples, respectively. In order to evaluate the radiological hazard of the natural radioactivity, radium equivalent activity (Raeq), representative level index (Iγr), the external hazard index (Hex), the total absorbed dose rate (D), the annual effective dose equivalent (AEDE) and excess life time cancer risk (ELCR) have been calculated and compared with the internationally approved values. Conclusion: The outdoor air absorbed dose rates (D) due to terrestrial gamma rays for soil have been calculated because of agricultural area and living in the surrounding. It is important to determine background radiation level in order to evaluate the health hazards. Annual effective gamma doses and the lifetime risks of cancer were higher than the world’s average. Moreover compared to the World’s average, the lifetime risk of cancer doubled for most of the localities.
Ph.d S. Dizman, R. Keser,
Volume 17, Issue 2 (4-2019)
Abstract
Background: The natural radioactivity levels in ceramic tiles produced in Turkey were determined and the related radiological hazards were assessed. Materials and Methods: The natural radioactivity levels (226Ra, 232Th and 40K) in the ceramic tiles were measured using high-purity germanium detector system (HPGe) and the related radiological hazards were assessed by radium equivalent activity (Raeq), external hazard index (Hex), representative level index (Iγ), absorbed dose rate (D) and annual effective dose (AED). Results: The average activity concentrations of 226Ra, 232Th and 40K radionuclides in the ceramic tiles were found to be 36.59 ± 2.64, 51.23 ± 2.81 and 420.81 ± 12.87 Bq/kg, respectively. These values are less than the world average values except the activity values of 232Th. Again, the averages of radiological hazard parameters (Raeq, Hex, D and AED) found for all ceramic tiles were found lower than the world averages. Conclusion: The present results was compared with the literature and the international reference values. This study shows that the investigated ceramic tiles can be used safely in constructions and do not create significant radiological hazard when used in constructions.
|
|
