Measurement of the mass attenuation coefficients and electron densities for BiPbSrCaCuO superconductor at different energies

The mass attenuation coefficients for Bi, Pb, Sr, Ca, Cu metals, Bi2O3, PbO, SrCO3, CaO, CuO compounds and solid-state forms of Bi1.7Pb0.3Sr2Ca2Cu3O10 superconductor were determined at 57.5, 65.2, 77.1, 87.3, 94.6, 122 and 136 keV energies. The samples were irradiated using a 57Co point source emitted 122 and 136 keV ?-ray energies. The X-ray energies were obtained using secondary targets such as Ta, Bi2O3 and (CH3COO)2UO22H2O. The ?- and X-rays were counted by a Si(Li) detector with a resolution of 0.16 keV at 5.9 keV. The effect of absorption edges on electron density, effective atomic numbers and their variation with photon energy in composite superconductor samples was discussed. Obtained values were compared with theoretical values. © 2007 Elsevier B.V. All rights reserved

Determination of the effective atomic numbers and electron densities for YBaCuO superconductor in the range 59.5-136 keV

The effective atomic numbers and electron densities of YBa2Cu3O7-? superconductor at 59.5, 65.2, 77.1, 94.6, 122 and 136 keV were calculated by using the measured mass attenuation coefficients. Measurements were made by performing transmission experiments in a well-collimated narrow beam geometry set-up by employing Si(Li) detector with a resolution of 0.16 keV at 5.9 keV. These values are found to be in good agreement with theoretical values calculated based on XCOM data. The observed crystal structure of YBa2Cu3O7-? superconductor is close to the theoretical structure. Zeff and Nel experimental values showed good agreement with the theoretical values for calcined and sintered YBa2Cu3O7-?. © 2008 Elsevier B.V. All rights reserved

Analysis of regional wild-type cereals in Trabzon-Turkey by EDXRF spectrometry

The energy dispersive X-ray fluorescence (EDXRF) spectroscopy was used to determine essential and trace element contents of some naturally grown wild-type cereals collected in different regions of Trabzon, Turkey. The samples were quantitatively analyzed using the standard addition method. The experimental set-up consisted of a Si(Li) detector, a multi-channel analyzer, and a 241Am and 55Fe radioactive source. The Si(Li) detector has a 13 ?m Bewindow and energy resolution of about 160 eV at 5.9 keV. Qualitative analysis of spectral peaks showed that the samples contained chlorine, potassium, calcium, titanium, iron, copper, strontium, yttrium, tin and barium. The results demonstrated that these cereals contain elements of vital importance for the human metabolism. © by PSP

Vacancy Transfer Probabilities from K to L Shell for Low Atomic Number Elements at 5.96 keV

WOS: 000280345100003Vacancy transfer probabilities from K to L shell were measured using I(K beta)/I(K alpha) intensity ratios for six elements in the atomic region 16 <= Z <= 22. The K X-rays from the targets excited by 5.96 keV (1.85 GBq (55)Fe filtered annular source) incident photon were obtained using a high resolution PGT model Si(Li) detector. Theoretical values were calculated using radiative and radiationless transition rates of these elements. The measured values of eta(KL) were compared with the theoretical ones. Reasonable agreement was typically obtained between present and theoretical values

Chemical effects on the K

Chemical effects on the Kβ/Kα X-ray intensity ratios for some Mn, Ni, and Cu complexes of a new schiff-base with salen N2H2 type were investigated. The samples were excited by 59.543 keV γ-rays from a 241Am annular radioactive source. K X-rays emitted by samples were counted by a Si(Li) detector with resolution 157 eV at 5.9 keV. We observed the chemical effect on the Kβ/Kα X-ray intensity ratios for Mn, Ni and Cu complexes. The experimental results showed that the Kβ/Kα X-ray intensity ratios for compounds with complexes are generally larger than those with salt form. The experimental values have been compared with the other experimental and the theoretically calculated values of pure elements. The results are in very good agreement with the others