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Wyświetlanie 1-15 z 49
Tytuł:
Investigation of Radiation Absorption Properties of Some India Granites
Autorzy:
Mavi, B.
Akkurt, I.
Powiązania:
https://bibliotekanauki.pl/articles/1402424.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.85.-m
78.20.Ci
Opis:
The radiation shielding properties of India granites have been investigated. Gamma-ray attenuation coefficients of some India granites were determined for different energies, 662, 1173, and 1332 keV. The results were compared with the calculation of XCOM at the photon energy of 1-10 GeV. Good agreement between experimental and theoretical results has been observed.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-370-B-371
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Radon Concentrations in Pamukkale-Turkey
Autorzy:
Kulalı, F.
Akkurt, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1402504.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.56.B-
87.66.-a
Opis:
Radon is an inert gas produced by the radioactive decay of radium with a half-life of 3.81 days. Radon is the largest source of natural ionizing radiation and every 2.6 km² of surface soil, to a depth of 15 cm, contains approximately 1 gram of radium, which releases radon in small amounts to the atmosphere. On a global scale, it is estimated that 91 TBq of radon are released from soil annually. In this work, the radon concentration in soil gas, which is transported from soil (1 m depth), is measured at five points in Pamukkale and its neighbourhood.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-445-B-446
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation exposure of medical staff in interventional radiology
Autorzy:
Kara, Ü.
Akkurt, I.
Powiązania:
https://bibliotekanauki.pl/articles/1068118.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.50.yk
87.57.uk
Opis:
The aim of this study was to assess the radiation dose received by doctors, nurses, X-ray technician medical staff during cardiac catheterization in a representative sample of the staff in our angiography department. Radiation from X-ray machines can cause serious side effects. Radiation exposure of angiography staff (doctors, nurses, medical staff and X-ray technicians) has been recognized as a necessary hazard in angiography department. The purpose of our work is to determine angiography staff radiation doses during interventional radiology, to identify procedures associated with higher radiation doses, and to determine the effects of various parameters on staff doses. This study was performed at Suleyman Demirel University Medical Faculty Hospital. The procedure of study was performed in an interventional radiology department. We have recorded radiation doses data during all related imaging procedures performed as a part of department activity. The distances from the X-ray tube were 0 cm (doctor), 60 cm (nurse), 120 cm (medical staff) and 180 cm (X-ray technician). It is important to understand the radiation effects on medical staff in interventional radiology procedures. Determinants of radiation risk include not only radiation dose levels but also medical staff number, ages, gender and their position. These factors can increase or decrease the risk of exposure.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 404-406
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of ⁴⁰K Concentration in Gravel Samples from Konyaalt i Beach, Antalya
Autorzy:
Seçkiner, S.
Akkurt, İ.
Günoğlu, K.
Powiązania:
https://bibliotekanauki.pl/articles/1031203.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
23.90.+W
78.66.SQ
Opis:
Terrestrial radioactivity is caused by the radioactive elements, located in various amounts in soil and rocks. The concentration of radioactive elements varies with the geographical and geological structure of the region and with the mineralogical composition of soil and rock. In this study, ⁴⁰K activity concentrations in gravel samples, collected from Konyaaltı Beach, were measured. The measurement was performed using gamma ray spectrometery at gamma spectrometry laboratory of Süleyman Demirel University.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 1095-1097
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of Detection Efficiency for the Gamma Detector using MCNPX
Autorzy:
Akkurt, İ.
Tekin, H.
Mesbahi, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402379.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.10.Rt
29.40.-n
Opis:
Radiation detection has been a main interest for researchers as all kind of produced particles in atomic and subatomic physics based on the measurement systems so-called detector. Detection efficiency is one of the main parameter in detection system besides many other different parameters of the detector. The absolute efficiency of the gamma detector system will be used at Turkish Accelerator and Radiation Laboratory at Ankara (TARLA) is simulated using MCNPX code (version 2.4.0). The MCNP is the general purpose MC code that can be used for neutron, photon, electron or coupled neutron, photon, electron transport. The results have been obtained for NaI(Tl) detector system and compared with the experimental results. A good agreement was found between calculation and experiment.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-332-B-334
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Gamma-ray Attenuation Coefficients at Different Energies in Amasya Marbles
Autorzy:
Mavi, B.
Oner, F.
Akkurt, I.
Powiązania:
https://bibliotekanauki.pl/articles/1402432.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
28.41.Qb
07.85.Nc
Opis:
The linear attenuation coefficients of different marble samples (Perlato Beige, Regal Beige and Crema Siva Beige) produced in Amasya were measured. The measurements have been performed at the photon energies of 511, 835 and 1274 keV which were obtained using $\text{}^{22}Na$ and $\text{}^{54}Mn$ sources. The measurements have been performed using a gamma spectrometer which contains 3"×3" NaI(Tl) detector connected to 16384 channel Multi-Channel-Analyser (MCA).
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-395-B-396
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of double differential cross sections of (γ,p) reaction for ¹²C nuclei
Autorzy:
Karpuz, N
Mavı, B.
Akkurt, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1068191.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
5.20.x
32.80.Cy
Opis:
Photonuclear reaction data, is important for basic and applied research. In additional to this, double differential data is especially vital in the field of nuclear medicine. The increase in the number of patients, admitted for treatment of cancer with heavy ions, poses a serious problem in terms of the risk of secondary cancer, as a result of exposure to particles of different energy and angle values, released after the nuclear reaction. The main point here is the possibility of damaging organs other than the treated one by the radiation generated in the reactions during the heavy ion therapy. Based on this, in order to assess the risk of secondary cancer the investigations of the double differential cross sections of reaction are required. Double differential cross sections of (γ,p) photonuclear reaction for ¹²C nuclei were calculated as functions of incoming photon energy and angle. Nuclear reaction simulation program TALYS 1.2 was used in the calculations. The calculated cross sections were compared with both the experimental cross sections and the evaluated cross sections available in literature.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 313-315
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Radiation Exposure Dose from Nuclear Medicine Procedures (Tc-99m MAG-3)
Autorzy:
Kara, U.
Yildiz, M.
Akkurt, I.
Powiązania:
https://bibliotekanauki.pl/articles/1031923.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.50.yk
87.57.uk
Opis:
Nuclear medicine is great for viewing the roles of body organs. Medical imaging in nuclear medicine takes radioactive pharmaceuticals and studies their path of progress through patient's body. The principles of nuclear medicine are different from those of diagnostic radiology. The nuclear medicine can study the functioning of body and how it actually works. On the other hand, usage of different kinds of radiopharmaceuticals in nuclear medicine examinations can affect the dose rates. The purpose of our investigation was to estimate the effective dose from most common procedures, performed in nuclear medicine departments. We noted the injection radiation doses, which are used for diagnosis in nuclear medicine clinics. Later patient radiation doses were calculated, according to models recommended in ICRP 106.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 883-885
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo Simulation Studies of Collimator Parameters for TARLA Bremsstrahlung Facility
Autorzy:
Kuluöztürk, Z.
Demir, N.
Akkurt, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1031457.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Tp
02.70.Uu
29.17.+w
Opis:
In this work, calculations of the design of bremsstrahlung photon collimator within the scope of the Turkish Accelerator Center Project are presented. At TARLA facility (Turkish Accelerator Radiation Laboratory at Ankara), bremsstrahlung photons created by the accelerated electron beams, are transferred to the experimental area through the collimator, which has a conical geometry with length of 320 cm. In this study, Al, Fe and Cu materials were selected as collimator materials. All interactions between the collimator materials and Gaussian photon beam in 8-32 MeV energy range (8 MeV, 16 MeV, 24 MeV and 32 MeV) were taken into account. The entry radius, geometry and chosen materials are important parameters for collimator design. The photon fluence from collimator, secondary particle distributions and the number of photons, scattered from the collimator, were calculated as functions of these parameters. All calculations were made with the Monte Carlo code FLUKA. According to the results of these simulations, collimator with conical geometry, made of aluminium, with 0.25 cm entry radius, was determined to be appropriate for TARLA bremsstarhlung photon facility of Turkish Accelerator Center.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 796-800
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of natural radioactivity and associated radiological hazard in excavation field in Turkey (Oluz Höyük)
Autorzy:
Çetin, B.
Öner, F.
Akkurt, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1070198.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.-n
29.85.Fj
Opis:
The level of natural radioactivity may be varied with the increase in dependence of the depth into the earth. In present study, soil samples from different depths were collected in Oluz Höyük excavation area. The radionuclide concentrations in soil samples were determined by gamma-ray spectrometer which contains 3" × 3" NaI(Tl) detector connected to multichannel analyser. The photopeaks at 1460, 1764, and 2615 keV due to ⁴⁰K, ²²⁶Ra and ²³²Th, respectively, have been used. The obtained activity concentrations of ⁴⁰K, ²²⁶Ra and ²³²Th ranged from 656.03 to 1791.85 Bq/kg, 62.39 to 180.93 Bq/kg and 48.31 to 125.43 Bq/kg, respectively. To assess the radiological hazard of the natural radionuclides content in the soil samples of these area, the radium equivalent activities (the minimum value was 181.99 Bq/kg and the maximum value was 497.97 Bq/kg), the absorbed dose rate (the minimum value was 86.83 nGy/h and the maximum value was 237.22 nGy/h), annual effective dose rate (the minimum value was 0.11 mSv/y and the maximum value was 0.29 mSv/y) and external hazard index (the minimum value was 0.49 and the maximum value was 1.35) were calculated using measured activities.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 475-478
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo Simulation of Photoneutron Dose in Radiotherapy Room as A Function of Gantry Angles
Autorzy:
Kara, Ü.
Mesbahi, A.
Akkurt, I.
Powiązania:
https://bibliotekanauki.pl/articles/1402427.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.10.Rt
87.16.af
Opis:
Using bremsstrahlung photon is one of the principal means to treat cancer. Bremsstrahlung photons are created in medical LINAC and the interaction of bremsstrahlung photon with the heavy nuclei that constitute the linac head shielding is the main process of neutron production inside the treatment rooms. The threshold of the neutron production for those materals is about 10 MeV. As the neutron is more dangerous than photon it is important to determine neutron dose during radiotherapy treatment. The neutron distribution depends on some parameters such as gantry angle. In this study neutron dose rate has been simulated as a function of gantry angle.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-378-B-380
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the radon levels in groundwater and thermal springs of Pamukkale region
Autorzy:
Kulalı, F.
Akkurt, I.
Özgür, N.
Powiązania:
https://bibliotekanauki.pl/articles/1065372.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
92.40.Kf
92.40.Qk
01.50.My
Opis:
Radon, which is the largest source of natural ionizing radiation, reaches surface as gas form or solvated in the ground water. Emanation of radon can has a profile which is disposed to increase or decrease depending on the effects of meteorological events or crust movements. Pamukkale, which was involved previously in the world heritage list of UNESCO, and the surrounding area have many groundwater and thermal springs that carry dissolved radon to surface. The aim of this study was to investigate the variations of radon in the water samples of the region.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 496-498
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation dose in dental radiology
Autorzy:
Kara, Ü.
Yıldırım, D.
Akkurt, I.
Powiązania:
https://bibliotekanauki.pl/articles/1065693.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.50.yk
87.57.uk
Opis:
The radiation is used in a wide range of medical fields, in diagnosis and treatment. Certain body parts, like thyroid, are more specifically affected by exposure to different types of radiation sources. The thyroid is highly susceptible to radiation carcinogenesis and exposure to ionising radiation is the only established cause of thyroid cancer. In this study, we have examined radiation doses measured during diagnosis which used dental panoramic radiography. The measurement has been performed in the Suleyman Demirel University, at PlanmecaProMax 3D (cone beam) imaging unit. The device operates at 66-70 kV, 8-10/22 mA/s.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 407-408
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation Protection in PET Room
Autorzy:
Kara, Ü.
Tekin, H.
Akkurt, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1402426.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.50.yk
87.57.uk
Opis:
Applications of radiation in medicine is based on the radiation ability of destroing the tumor cells and creating the images of internal organs. This two features play an important role in the diagnosis and treatment of diseases by radiation. In medicine X-ray and radionuclides being sources of gamma rays as $Tc^{99m},$ $I^{137},$ or $Tl^{201}$ are used for the diagnosis of diseases, as beta particles uses for the treatment of diseases. In nuclear medicine radioactive isotopes are built into pharmaceuticals and create radiopharmaceuticals. Radiopharmaceutical administered to patient gathers in examined organ and gives information on functional and anatomical status of the organ. Radiation workers prepare radiopharmaceuticals, transport it, implement, take diagnostic images and survey the therapy. Their radiological protection is very important. Efficient radiation protection can be achieved by factors of time (reduce the time spent close to radioactive source to minimum), distance (keep maximal distance to radioactive source), and shielding (sufficient amount of protective material placed between the source and body) concepts are the basis.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-375-B-377
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoneutron Dose Measurement in Radiotherapy Room
Autorzy:
Kara, Ü.
Mesbahi, A.
Akkurt, I.
Powiązania:
https://bibliotekanauki.pl/articles/1402425.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.56.-v
87.55.Qr
Opis:
Cancer is one of the main disease to threat for human health. Besides surgery and medical treatment (chemotherapy), radiotherapy is commonly used treatment method to kill cancer cell. For this method high energy photon is required. Clinic Lineer Accelerator (cLINAC) relatively lower energy than other LINAC has been used to obtain photon via bremsstrahlung processes. When accelerated electron beam impinges to the thin target bremsstrahlung occurs and photon can be created. Those photons can be focused on cancer cell and kill cancer. In order to focus photon beam collimator materials in LINAC head generally contains heavy elements is used and the interaction of bremsstrahlung photon with the such heavy nuclei the neutron can be produced inside the treatment rooms. The threshold of the neutron production for those materals is about 10 MeV. As the neutron is more dangerous than photon it is important to determine neutron dose during radiotherapy treatment. In this study neutron dose rate has been measured and simulated in radiotherapy room.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-372-B-374
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 49

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