Browsing by Author "Gunay, O."

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Citation Count: 0
Determination of Environmental Noise Contamination
(Polish Acad Sciences inst Physics, 2020) Gunay, O.; Yarar, Onur; Sarıhan, Mucize; Ağız ve Diş Sağlığı / Mouth and Dental Health; Radyoterapi / Radiotherapy
Noise pollution - one of the major environmental problems, affects people both physiologically and psychologically. Noise measurements must be carried out regularly to overcome the noise problem. The study in this paper was conducted to determine the noise level in different parts of an education and research hospital in Istanbul. Noise levels were measured at the main entrance, pediatric department, emergency room entrance, audiology clinic, nuclear medicine cardiology clinic, eye clinic, and emergency service corridor of the hospital. Measurements were taken on Monday, Tuesday, Wednesday, Thursday, and Friday, every hour from 08:00 in the morning to 17:00 in the afternoon. As a result, average noise levels were found between 52 dB and 57 dB in different parts of the hospital. The results were compared with similar studies and recommendation in WHO guidelines.
Citation Count: 6
Determination of indoor radon levels at campuses of uskudar and Okan Universities
(Springer, 2019) Kulali, F.; Gunay, O.; Akozcan, S.
Radon is the largest source of natural radiation all people exposed to. It can form in houses due to building materials or enters through cracks in walls, basement floors and with water used in bathroom showers and faucets. The buildings keep radon inside, where it accumulates and may become a health hazard if the building is not properly ventilated. Radon can be inhaled into the lung, and especially short-lived products of its disintegration can cause long-term internal exposure. In this study, indoor radon survey was carried out at several campuses of uskudar and Okan Universities by using AlphaGUARD active radon detector.
Citation Count: 4
Determination of radiation dose from patients undergoing Tc-99m Sestamibi nuclear cardiac imaging
(Springer, 2019) Gunay, O.; Sarıhan, Mucize; Yarar, Onur; Abuqbeitah, M.; Demir, M.; Sonmezoglu, K.; Gundogdu, O.; Radyoterapi / Radiotherapy; Ağız ve Diş Sağlığı / Mouth and Dental Health
To date, myocardial perfusion (MP) has been utilized to assess the adequacy of blood flow to the myocardium in order to determine the ischemic heart diseases. With the advent of SPECT/CT, MP became the most common investigation in the field of nuclear cardiology with more accuracy and details. Thallium-201 and Technetium-99m (Tc-99m) have been early used in cardiac nuclear imaging. Half-life of Tc-99m is 6 h, and its energy is 140 keV, while the half-life of Tl-201 is as longer as 73 h, its X-ray energies range between 69 and 81 kV in addition to gamma rays of 135 keV and 167 keV. The purpose of the present study was to explore the radiation dose rates emitted from the patients following Tc-99m sestamibi injection. To achieve that, the radiation emanated to the environment was measured at different distances from patients and various time intervals for 20 patients using GM counter. The mean radioactivity administered to the patients was 391.1 MBq (10.6 mCi), with a range between 276.8 MBq to maximum of 515.4 MBq. Radiation dose rate was found 9.07 mu Sv h(-1) at 1 m distance from the patient's chest level after 7.6 min, then decayed to 7.93 mu Sv h(-1) after 36.5 min, and 7.83 mu Sv h(-1) later to 66.4 min. It was concluded that 1 m distance from the patients sounds sensibly adequate to maintain the occupational dose within the safe limit following Tc-99m sestamibi injection, while verification of public dose rate <= 1 mu Sv h(-1) at 1 m distance from the patient prolongs to 14 h following Tc-99m injection.
Citation Count: 7
Environmental radiation dose rate arising from patients of PET/CT
(Springer, 2019) Gunay, O.; Abamor, E.
One of the most widely used methods for the screening of cancer patients today is PET/CT. The most widely used radiopharmaceutical in PET/CT imaging is fluorine-18 deoxyglucose (18F-FDG). PET/CT imaging is performed 40-60 min after intravenous injection of F18-FDG to the patient. After the FDG injection, the patients transmit radiation to the environment. The emitted radiation dose rate varies according to the activity of the radioactive substance given to the patient. In this study, the dose rate of radiation emitted from FDG-injected patients was determined both by distance and by time. The results obtained are compared with similar studies. In terms of radiation safety, the required distance between the patient and the radiation worker is calculated. This calculated distance varies according to the time of injection, since fluorine-18 radioisotope has 110-min half-life.
Citation Count: 13
Natural radioactivity analysis of soil samples from Ganos fault (GF)
(Springer, 2019) Gunay, O.; Sac, M. M.; Ichedef, M.; Taskopru, C.
Natural radioactivity is widespread in the earth and is present in different environment geological formations in the soil and rocks. Natural radionuclides in soil originate from the members of U-238 and Th-232 series, and K-40 radionuclide is the main external source of radiation to the human body. In this study, concentrations of the natural radioactivity Ra-226, Th-232, and K-40 are measured in soil samples collected along the Ganos fault. The radioactivity levels of the soil samples for the study are determined by scintillation gamma spectroscopy. Concentrations of Ra-226 in the soil samples ranged from ND to 24.1 Bq kg(-1), Th-232 concentrations from ND to 40.2 Bq kg(-1), and K-40 concentrations from 315.9 to 748.9 Bq kg(-1). Obtained results were compared with the literature data.
Citation Count: 6
Noise pollution level in a pediatric hospital
(Springer, 2019) Yarar, O.; Yarar, Onur; Gunay, O.; Ağız ve Diş Sağlığı / Mouth and Dental Health
Noise is unwanted and unpleasant sound. The noise in the hospitals disturbs the patients and employees. Therefore, the noise levels in hospitals should be monitored and measured continuously. This study was carried out to find the noise level in Zeynep Kamil Hospital. In this research, DT-805 model, CEM brand sound meter was used. This study in the hospital was performed on Tuesday, Friday and Saturday in the operating room, clinic and outpatient departments. As a result of this study, the highest average noise level measured at the hospital is 81.25 +/- 3.21 dB and the lowest noise level is 52.51 +/- 2.37 dB. Noise level of outpatient was higher than operating room and clinics. In outpatient, in clinics and in the operating room, the night noise level was found to be lower than the daytime. The noise levels measured in this study are much higher than the internationally recommended noise levels.