Results 291 to 300 of about 773,148 (338)

Effective atomic numbers for CoCuNi alloys using transmission experiments

Journal of Quantitative Spectroscopy and Radiative Transfer, 2005
Abstract Effective atomic numbers for CuCoNi alloys against changing Ni contents were measured in the X-ray energy range from 15.746 to 40.930 keV. The gamma rays emitted a 241 Am point source have been send on absorbers to be used transmission arrangement. The X-rays were counted by a Si(Li) detector with a resolution of 160 eV at 5.9 keV.
Karahan, IH, Erzeneoglu, Salih Zeki, Icelli, O, Cankaya, G   +3 more
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Effective principal quantum numbers of valence atomic orbitals

Chemical Physics Letters, 1971
Abstract Analysis of radial moments of Hartree-Fock atomic orbitals shows that their shape near the radial maximum implies an effective principal quantum number that remains small even for heavier elements.
H.S. Aldrich, L.C. Cusachs
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Effective Atomic Number and Energy Absorption in Tissues

The British Journal of Radiology, 1946
An X-ray absorption method, using Ross balanced filters, is applied to measure the effective atomic number of excised body tissues. The results are used to calculate linear absorption coefficients and the true energy absorption in ergs per rontgen for these tissues over a wide range of wavelength.
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Effective atomic number and electron density of marble concrete

Journal of Radioanalytical and Nuclear Chemistry, 2012
The effective atomic numbers (Z eff) and effective electron density (N e) of different type concrete have been measured and the results were compared with the calculation obtained using the mass attenuation coefficients (μ/ρ) obtained via XCOM in the photon energy range of 1 keV–100 GeV.
El-Khayatt, A. M., AKKURT, İskender
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A comparative study of effective atomic number calculations for dual‐energy CT

Medical Physics, 2021
AbstractPurpose: Several new formalisms of Effective Atomic Number () have emerged recently, deviating from the widely accepted Mayneord's definition. This comparative study aims to reexamine their theories, reveal their connections, and apply them to material differentiation on dual‐energy computed tomography (DECT).Methods: The first part of this ...
Wenli Cai, Guobin Hong, Tianyu Liu
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Effective atomic number in the Rayleigh to Compton scattering ratio

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1999
Abstract Detection and counting X-ray photons scattered by the Rayleigh and Compton processes enable matter to be characterized locally. A theoretical relation was first established which simulates the result of a Rayleigh to Compton ratio measurement.
Philippe Duvauchelle, Daniel Babot, Gilles Peix   +2 more
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Investigation of Comet Wild-2 in terms of effective atomic numbers

Advances in Space Research, 2015
Abstract Effective atomic numbers ( Z eff ) and effective electron densities ( N el ) of 69 samples collected from Comet Wild-2 within scope of Stardust mission were determined in the energy range from 1 keV to 100 GeV. The data were individually evaluated for Wild-2 olivines, pyroxene, Fe Ni sulfide and silicate glass samples to obtain remarkable ...
Han, Ibrahim, Un, Adem, Alim, Bunyamin
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Effective Atomic Weight, Effective Atomic Numbers and Effective Electron Densities of Hydride and Borohydride Metals for Fusion Reactor Shielding

Journal of Fusion Energy, 2014
The effective atomic weight, A eff , mass attenuation coefficients, μ/ρ, half-value layer, HVL, effective atomic numbers, Z eff and effective electron densities, N eff of hydride and borohydirde metals,
Vishwanath P. Singh, Vishwanath P. Singh, N.M. Badiger   +2 more
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Determination of effective atomic numbers, effective electrons numbers, total atomic cross-sections and buildup factor of some compounds for different radiation sources

Radiation Physics and Chemistry, 2017
Abstract The photon interaction parameters such as mass attenuation coefficient, effective atomic number, effective electron density, buildup factor have been measured for Fe(NO3)3, V4O2, NaCO3·H2O, C6H5FeO7·H2O and CuCI compounds using 137Ba, 157Gd and 241Am γ-rays sources in stable geometry.
Levet, Aytaç, Özdemir, Yüksel
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Mass attenuation coefficients, effective atomic numbers and effective electron densities for some polymers

Radiation Protection Dosimetry, 2012
In this study, the total mass attenuation coefficients (μ(m)) for some homo- and hetero-chain polymers, namely polyamide-6 (PA-6), poly-methyl methacrylate (PMMA), low-density polyethylene (LDPE), polypropylene (PP) and polystyrene (PS) were measured at 59.5, 511, 661.6, 1173.2, 1274.5 and 1332.5 keV photon energies.
Küçük, Nil, Isitman, Nihat Ali, Cakir, Merve   +2 more
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