Browsing by Author "Gunay, Osman"

Now showing 1 - 7 of 7

Citation Count: 11
Assessment of lifetime cancer risk from natural radioactivity levels in Kadikoy and Uskudar District of Istanbul
(Springer Heidelberg, 2018) Gunay, Osman
The activity concentrations of Ra-226, Th-232, and K-40 are measured in soil samples from various locations in the Kadikoy and Uskudar district of Istanbul (Turkey). The Ra-226 activity concentrations range from 19.97Bqkg(-1) to 50.80Bqkg(-1) and average Ra-226 concentration value 31.40Bqkg(-1) was calculated. The Th-232 activity concentrations range from 21.38Bqkg(-1) to 52.61Bqkg(-1) and average Th-232 concentration value 34.44Bqkg(-1) was calculated. The K-40 activity concentrations range from 464.06Bqkg(-1) to 711.27Bqkg(-1) and average K-40 concentration value 619.59Bqkg(-1) was calculated. In addition, radium equivalent (Ra-eq), absorbed gamma dose rate (D), annual effective dose equivalent, (AEDE), excess lifetime cancer risk (ELCR) were calculated in this study. All of the calculations have been compared with both national and international standards and similar studies. As a result of this comparison, levels of natural radioactivity and radiological effects were slightly higher than the World average and Turkey.
Citation Count: 0
Comparison between planar, SPECT and SPECT/computed tomography systems in 99mTc-nanocolloid sentinel lymph node imaging: phantom design and clinical investigations (vol 40, pg 786, 2019)
(Lippincott Williams & Wilkins, 2019) Isikci, Nazenin Ipek; Abuqbeitah, Mohammad; Gunay, Osman; Yeyin, Nami; Uslu-Besli, Lebriz; Sager, Sait; Demir, Mustafa
[No Abstract Available]
Citation Count: 24
Determination of terrestrial radiation level and radiological parameters of soil samples from Sariyer-Istanbul in Turkey
(Springer Heidelberg, 2019) Gunay, Osman; Eke, Canel
Radiation directly or indirectly affects human health. So, it is significant to work out the concentration of environmental radioactivity. The natural terrestrial radiation concentration level consists of Ra-226, Th-232, and K-40 concentrations. In this study, natural terrestrial radioactivity concentrations were examined in Sariyer district of Istanbul. Ra-226, Th-232, and K-40 concentrations were determined using a high-purity germanium detector (HPGe). The soil samples were collected from 18 different points within the boundaries of Sariyer district. The mean Ra-226 and Th-232 concentrations in this study were 30.78 +/- 2.26 Bq kg(-1) and 45.57 +/- 3.99 Bq kg(-1) respectively. K-40 concentrations were calculated as 863.70 +/- 48.70 Bq kg(-1). Also, radiological parameters were calculated and compared with limit value of world average.
Citation Count: 10
Measurement of indoor radon concentration and annual effective dose estimation for a university campus in Istanbul
(Springer Heidelberg, 2019) Gunay, Osman; Akozcan, Serpil; Kulali, Feride
Radiation is a natural part of the environment that people interact continuously, and radon is one of the most important sources because of its abundance and mobility. Due to gas form, radon can reach and accumulate in living places easily. Inhalation of radon and its progenies is an important risk factor for health hazards. Accurate measurement of radon levels is quite essential for the dose evaluation of radon exposure in buildings. In this study, radon activity measurements have been performed by using AlphaGUARD portable radon detector at several locations in Akfirat campus of Istanbul Okan University. Annual effective doses were calculated by using ICRP regulations for various exposure periods.
Citation Count: 10
Monte Carlo simulations and forecasting of Radium-226, Thorium-232, and Potassium-40 radioactivity concentrations
(Springer, 2020) Kulahci, Fatih; Akozcan, Serpil; Gunay, Osman
This study depicts the radioactivity time series levels of Ra-226, Th-232, and K-40 prospectively by Monte Carlo simulations (MCSs). Three ARIMA stationary stochastic processes are used with measurement records statistical parameter conservation. The MCSs by means of the ARIMA stochastic processes, the statistical characteristics of the radionuclide data are determined and the future simulation forecasts are made for different periods (time between two measurements, i.e. 1 week). Future concentrations of radionuclides with MCS are estimated for the first time. The results obtained on the transport, control and management of radionuclides can also reach similar gains for other different materials.
Citation Count: 7
Radiological risk from activity concentrations of natural radionuclides: Cumulative Hazard Index
(Springer, 2021) Akozcan, Serpil; Kulahci, Fatih; Gunay, Osman; Ozden, Selin
The Cumulative Hazard Index method has been proposed for the first time to determine the low and high-risk levels of radionuclides. The significant radiological parameters and risk analyses for Ra-226, Th-232 and K-40 pollution levels control in the soil are determined through the probability distribution functions. The activity concentration of Ra-226, Th-232 and K-40 in samples were found to vary from of 16 +/- 0.6 to 62 +/- 3.2 Bq kg(-1) with an average 30 +/- 1.1 Bq kg(-1), 24 +/- 0.9 to 63 +/- 1.3 Bq kg(-1) with an average 37 +/- 1.0 Bq kg(-1) and 316 +/- 5.8 to 878 +/- 6.9 Bq kg(-1) with an average 525 +/- 6.2 Bq kg(-1), respectively.
Citation Count: 12
Soil gas radon concentrations along the Ganos Fault (GF)
(Springer Heidelberg, 2018) Gunay, Osman; Sac, Muslim Murat; Ichedef, Mutlu; Taskopru, Caner
In this study, soil radon levels have been measured for the first time across the Ganos fault (GF), which is known as the western part of the North Anatolian Fault Zone. LR 115 Type 2 Solid State Nuclear Track Detectors (time integrated) have been applied to determine soil gas radon levels, and the survey was performed in 16 stations along the fault line. The results showed that soil gas radon concentrations and variation of concentration levels are comparable high along the fault line. It is also observed that in the middle of the Ganos Fault, fairly elevated radon levels were detected. These can be related to the activity of the fault lines. It is confirmed that the study area has a very active tectonic structure and is great location for analyzing radon variations.