Measurement of L-3 subshell absorption jump ratios and jump factors for high Z elements using EDXRF technique

WOS: 000336018400014Energy dispersive X-ray fluorescence technique (EDXRF) has been employed for measuring L-3-subshell absorption jump ratios, r(L3) and jump factors, J(L3) for high Z elements. Jump factors and jump ratios for these elements have been determined by measuring L-3 subshell fluorescence parameters such as L-3 subshell X-ray production cross section sigma(L3), L-3 subshell fluorescence yield, omega(L3) total L-3 subshell and higher subshells photoionization cross section sigma(T)(L) Measurements were performed using a Cd-109 radioactive point source and an Si(Li) detector in direct excitation experimental geometry. Measured values for jump factors and jump ratios have been compared with theoretically calculated and other experimental values. (C) 2014 Elsevier Ltd. All rights reserved.TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)M.R. Kacal is thankful to TUBITAK for the financial support

Investigation of radiation attenuation parameters of some drugs used in Chemotherapy in Wide Energy Region

Objectives: The aim of this study is to compute the radiation attenuation parameters such as mass attenuation coefficient, linear attenuation coefficient, half value layer, mean free path, and effective atomic number for some selected chemotherapy drugs such as Lomustine, Cisplatin, Carmustine, and Chlorambucil in the energy range from 1 keV to 100 GeV. Materials and Methods: The mass attenuation coefficients were calculated with the help of WinXCOM program. Using the obtained mass attenuation coefficients, other parameters such as linear attenuation coefficient, half value layer, mean free path, and effective atomic number were derived. Results: It is observed that the variations of these parameters with respect to the photon energy show changes in different energy regions. According to the obtained results, Cisplatin has the highest mass attenuation coefficient, linear attenuation coefficient and effective atomic number results among the selected chemotherapy drugs. Moreover, Chlorambucil has the highest half value layer and mean free path results among the selected chemotherapy drugs. Conclusion: The results of this study are useful for applied science fields such as radiation physics, pharmacology, and medical physics. These results may be useful when the selected chemotherapy drugs are used together with radiology

The excitation probabilities of K alpha,beta and L alpha 1,2 for some elements in 56 <= Z <= 68 at 59.54 keV

DURAK, RIDVAN/0000-0002-3935-176X; Durak, Ridvan/0000-0002-3935-176X; Akman, Ferdi/0000-0002-8838-1762WOS: 000367282200005The K alpha,beta and L alpha(1,2) excitation probabilities for some elements in 56 <= Z <= 68 at 59.54 keV were obtained using a Si(Li) detector with a multichannel analyzer. It is the first time that the K alpha,beta and L alpha(1,2) excitation probabilities were determined for the present elements. To obtain the K alpha,beta and L alpha(1,2) excitation probabilities, the K and L-3 shell/sub-shell absorption jump factors and the K and L-3 shell/sub-shell fluorescence yields were determined experimentally. The measured results of absorption jump factor and fluorescence yield were compared with the theoretical and other experimental results. The determined excitation probabilities were compared only with theoretical calculated ones since there are no other experimental reports for the present elements in the literature. (C) 2015 Elsevier Ltd. All rights reserved

Determination of K shell absorption parameters for some lanthanides using the X-ray attenuation method

Durak, Ridvan/0000-0002-3935-176X; DURAK, RIDVAN/0000-0002-3935-176X; Akman, Ferdi/0000-0002-8838-1762WOS: 000367613700014The total attenuation cross section at the K edge, absorption jump ratio, jump factor, Davisson-Kirchner ratio, and oscillator strength parameters for the K shell were determined by measuring the total attenuation cross sections around the K edge for Pr, Nd2O3, and Sm. The measurements were performed in a secondary excitation geometry using the K alpha(2), K alpha(1), K beta(1), and K beta(2) X-rays (in the region from 31.817 to 55.293 keV) from different secondary source targets excited by the 59.54 keV gamma-photons from an Am-241 annular source. It is the first time that the Davisson-Kirchner ratio values have been determined for present samples. The experimental results were compared with the theoretically calculated and other available experimental results.Ataturk UniversityAtaturk University [2011/82]This work was done with the support of the Ataturk University Research Fund under project No. 2011/82

Chemical effect on the K shell absorption parameters of some selected cerium compounds

Durak, Ridvan/0000-0002-3935-176X; DURAK, RIDVAN/0000-0002-3935-176X; Akman, Ferdi/0000-0002-8838-1762WOS: 000387860100006In this study, the photoelectric cross section values of Ce, CeCl3 center dot 7H(2)O, Ce-2(SO4)(3), Ce(OH)(4) and Ce2O3 samples were measured in the energy range from 31.82 keV up to 51.70 keV by adopting in narrow beam geometry. Using these photoelectric cross sections, the K shell photoelectric cross sections at the K-edge, the K shell absorption jump ratios and jump factors, the Davisson-Kirchner ratios and K shell oscillator strength values were estimated experimentally. The measured parameters were compared with the theoretical calculated values. It is observed that the K shell photoelectric cross section at the K-edge and K shell oscillator strength values of an element are affected by the chemical environment of material while the K shell absorption jump ratio, K shell absorption jump factor and Davisson-Kirchner ratio are not affected by the chemical environment of material for the present samples. To the best of our knowledge, the chemical effects on the Davisson-Kirchner ratio and K shell oscillator strength have not been discussed for any element by now

Kinematic coefficient ratios, anisotropy parameters, and polarization degrees of L-3 X-ray transitions of Bi, Pb, Ta, Lu, and Yb

DURAK, RIDVAN/0000-0002-3935-176X; Durak, Ridvan/0000-0002-3935-176XWOS: 000362459300027The anisotropy parameter values 13 of the I. shell fluorescent X-rays (Li (L-3-M-1), L beta(6) (L-3-N-1), L alpha(1,2) (L-3-M-5,M-4) and L-beta 2,L-5 (L-3-N-5,N-4) of Bi, Pb, Ta, Lu, and Yb excited by 22.6 keV photons were measured. These values were used to determine the kinematic coefficient ratios alpha(L iota/L-alpha 1,L-2), alpha(L-1/L beta(6)), and alpha(L alpha(1,2)/L beta(2,15)). The L-i and L beta(6) X-rays were found to be anisotropically emitted whereas L alpha(1,2) and L beta(2,15) X-rays showed less anisotropic spatial distributions. Also, the polarization degrees of L iota and L alpha X-rays were measured for the present elements and observed that the Li lines were found to be strongly polarized whereas the La lines showed less polarization.TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)MRK is thankful to TUBITAK for the financial support

Investigation of radiation shielding properties for some ceramics

Akman, Ferdi/0000-0002-8838-1762WOS: 000457480900009In this work, the radiation shielding parameters like mass and linear attenuation coefficient, half value layer, tenth value layer, mean free path, effective atomic number, effective electron density, exposure buildup factor and fast neutron removal cross section were examined for the peridot, aluminum nitride, ruby, yttrium oxide, magnesium silicate, and silicon nitride ceramic samples. Furthermore, the dependence of the effective conductivity on the energy was investigated. The experimental studies were carried out in the photon energy range of 81 keV-1333 keV using a high resolution HPGe detector and six different radioactive sources. The experimental results were validated with the theoretical results and a good agreement was observed for all samples. The yttrium oxide has more shielding effectiveness for y radiation, while magnesium silicate, aluminum nitride and silicon nitride possess least y-ray shielding. However, the optimum neutron shielding material is ruby.Scientific Research Projects Coordination Unit of Giresun University [FEN-BAP-A-160317-23]This paper was produced from the project (number: FEN-BAP-A-160317-23) supported by The Scientific Research Projects Coordination Unit of Giresun University

Measurements of K shell absorption jump factors and jump ratios using EDXRF technique

In the present work, the K-shell absorption jump factors and jump ratios for 30 elements between Ti (Z = 22) and Er (Z = 68) were measured by energy dispersive X-ray fluorescence (EDXRF) technique. The jump factors and jump ratios for these elements were determined by measuring the K shell fluorescence parameters such as the Kα X-ray production cross-sections, K shell fluorescence yields, Kβ-to-Kα X-rays intensity ratios, total atomic absorption cross sections and mass attenuation coefficients. The measurements were performed using an Am-241 radioactive point source and a Si (Li) detector in direct excitation and transmission experimental geometry. The results for jump factors and jump ratios were compared with theoretically calculated and the ones available in the literature

Photon Absorption characteristics of some selected Enzyme Inhibitors used in Cancer Research in the Energy range 1 keV-100 GeV

The absorption parameters such as total mass attenuation coefficients, molecular, atomic, and electronic cross sections, effective atomic numbers and electron densities were calculated for some selected enzyme inhibitors in the photon energy range from 1 keV up to 100 GeV. The changes in the absorption parameters were interpreted with the photoelectric effect, Compton scattering and pair production processes. It is observed that the 2-Imino-1-imidazolidineacetic acid enzyme inhibitor has more radiation shielding feature when compared to other chosen enzyme inhibitors. The present investigation is anticipated to be useful for researchers studying with radiation in several fields and cancer researchers

Experimental investigation of photon attenuation parameters for different binary alloys

WOS: 000462019200006Recently, technologists try to develop novel gamma radiation shielding materials instead of traditional materials such as lead and concrete with improved performance in gamma radiation shielding in medical applications and nuclear reactors. For this purpose, alloys such as stainless steel (SS) and carbon steel (CS) attracted much attention, these days. Preliminary results on such alloys have shown better attenuation of gamma rays as compared to traditional shielding materials. This work aimed to conduct research on different alloy samples to evaluate their radiation attenuation efficiency and their suitability for radiation shielding when utilized in nuclear facilities. The mass attenuation coefficients for eight alloy samples were measured at different photon energies ranging from 80.997 to 1332.501 keV using transmission geometry. From the mass attenuation coefficients, different photon attenuation parameters such as half value layer, mean free path, effective atomic number, and radiation protection efficiency were evaluated. In addition, the equivalent atomic number and the exposure buildup factor were calculated using G-P fitting method for photon energy ranging from 0.015 MeV to 15 MeV at different penetration depth. The results showed that the Z(eff) values remain almost constant for all samples except W72/Cu28 in which the Z(eff) for this sample tends to decrease with the energy. The lowest value of half value layer is found for the alloy sample Ta97.5/W2.5 and the highest value is found for the alloy sample In50/Sn50. The Ta97.5/W2.5, Ta90/W10, Ta95/W5 samples demonstrated good radiation attenuation properties.University of Tabuk [S-1439-0091]The authors would like to thank the University of Tabuk for the financial support under the research project number S-1439-0091