64 research outputs found
Energy absorption buildup factors of human organs and tissues at energies and penetration depths relevant for radiotherapy and diagnostics
Radiological properties of healthy, carcinoma and equivalent breast tissues for photon and charged particle interactions
Remarks on the extension and validity of an empirical formula for the fast-neutron removal cross-section:The effective atomic weight
Determination of trace element levels in human blood serum from patients with type II diabetes using WDXRF technique: A comparative study
Leaded brass alloys for gamma-ray shielding applications
The leaded brasses show high machinability and atmospheric corrosion resistance. Hence, they are being used in different applications such as machine parts, valves, fittings etc. Besides, they can serve as radiation shields as they contain lead and their radiation shielding properties were not investigated so far. Thus, the aim of this study is to determine the radiation shielding properties of leaded brasses. Standard (CuZn) and leaded (CuZnPb) brasses were prepared and their mass attenuation coefficients (?/?), half-value layers (HVL), tenth-value layers (TVL), mean free paths (MFP) and effective atomic numbers (Z eff ) were determined. Linear attenuation coefficients (?) of the alloys were measured first at 53, 276, 302, 356 and 383 keV using a HPGe detector and a 133 Ba radioactive source. These values were then used to obtain other parameters. A good agreement was observed between experimental and theoretical results for HVL, TVL and MFP (Dif. ? 9%). Photon buildup through the present materials was studied in terms of exposure buildup factor (EBF). Results were presented and discussed regarding the photon energy and penetration depths. Fast neutron removal cross sections were also calculated for the given alloys. Some alloys were also evaluated morphologically by using EDX mapping. The leaded brasses were compared with standard shielding concretes and superior shielding properties against gammas and fast neutrons were obtained when compared with concretes. © 2019 Elsevier Lt
Estimation of effective atomic number in the Rayleigh to Compton scattering ratio using different methods
Laterally inhomogeneous barrier analysis of cu/n-gap/al schottky devices
1st International Physics Conference at the Anatolian Peak, IPCAP 2016 -- 25 February 2016 through 27 February 2016 -- -- 122235In this study, we examined the electrical parameters of Cu/n-GaP/Al Schottky structures at room temperature and examined the electrical characterization of these devices depending on and Capacitance-Voltage (C-V) and Current-Voltage (I-V) measurements. A statistical study on the experimental ideality factor (n) and BHs(barrier heights) values of the devices was stated. The n and BHs of all contacts have been determined from the electrical characteristics. Even though all of the diodes were conformably prepared, there was a diode-todiode variation: the effective BHs changed from 0.988-0.07 to 1.216-0.07 eV, and the n from 1.01-0.299 to 2.16-0.299. The yielded results show that the mean electrical parameters of Schottky devices are different from one diode to another, even if they are identically prepared. It can be axplained that the lower BHs usher with the higher n values owing to inhomogeneities. © Published under licence by IOP Publishing Ltd
Estimation of energy absorption buildup factors of some human tissues at energies relevant to brachytherapy and external beam radiotherapy
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