Cilt:04 Sayı:01 (2017)
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Item Thermal Fading Rates in LiF:Mg, Ti Main Thermoluminescence Peaks(Ankara : Ankara Üniversitesi, 2017) Halimi, M.; Kadri, D.; Mokeddem, A.; Missoum, I.; Fen FakültesiThermal fading (TF) is an important characteristic in choosing appropriate thermoluminescence (TL) materials for particular applications. TF is the process of reducing the capability of producing the response due to radiation exposure. The fading rate of LiF based thermoluminescent (TL) material depends on many experimental parameters such as storage temperature, readout mechanism, annealing and radiation type or time based on the storage time before or after radiation. The general aim of the present work is to investigate if the activation energy E, frequency factor s, maximum temperature, Tm and concentration, n values evaluated from the experimental thermal fading rates glow–curves through a computerized glow–curve deconvolution analysis (CGCD), can simulate the thermal fading glow-curves using a phenomenological model for LiF:Mg, Ti.Item Assessment of Gama Dose Rates around Gaziantep City, Turkey(Ankara : Ankara Üniversitesi, 2017) Zuhur, S.; Çeliktürk, D.; Yazıcı, A. N.; Öztürk, Z.; Fen FakültesiIn this study, the measurements were performed 1 m above the ground in air and surface soils at certain points in the city of Gaziantep located at south of Turkey with a populatıon of 1.5 million. Air and soil measurements were carried out by portable detectors and gamma spectrometry system. As a result of measurements performed in the air, average annual effective dose of 66.81 µSv y-1 and gamma counting of 50.43 1 s-1 were found. On the other hand, as a result of gamma spectrometric analyses in the surface soil samples, average activity concentrations of 226Ra, 232Th and 40K were found to be 28.92, 29.49 and 255.30 Bq kg-1, respectively. Calculated absorbed dose rate and annual effective dose values depending on the activity concentrations, were found to be 38.45 nGy h-1 and 47.17 µSv y-1. When the measured values are compared with UNSCEAR 2000 report’s worldwide average value, our result is slightly lower than these values.Item On the Role of Strong Coupling Constant and Nucleons in Understanding Nuclear Stability and Binding Energy(Ankara : Ankara Üniversitesi, 2017) Seshavatharam, U.V.S.; Lakshminarayana, S.; Fen FakültesiBy considering nucleon and electron rest masses and with reference to nuclear charge radius and strong coupling constant, we make an attempt to understand beta stability line and nuclear binding energy in a simplified semi empirical approach. In this context, we consider ( 1 α s ) ( e 2 8 π ϵ 0 R 0 ) ≅ 4 . 8 6 ( α s 1 )( 8πϵ 0 R 0 e 2 )≅4.86 MeV as a single nuclear binding energy coefficient or potential.Item A Theoretical Analysis of Quasi-elastic Scattering of 7Li by 120Sn Using Various Nuclear Potentials(Ankara : Ankara Üniversitesi, 2017) Aygün, Murat; Fen FakültesiThe quasi-elastic scattering data of 7Li + 120Sn reaction at ELab = 19.5, 20.5, and 25.0 MeV incident energies have been reanalyzed within the framework of the optical model. In order to obtain the real potential, seven different nuclear potentials have been used. The imaginary potential has been assumed in Woods-Saxon form. The theoretical results have been compared with each other as well as the experimental data.