Results 251 to 260 of about 14,777,258 (301)

The effective atomic number and the calculation of the composition of phantom materials

The British Journal of Radiology, 1969
Abstract The formula for photoelectric absorption given by Walter (1926), used by Spiers (1946) for the calculation of an effective atomic number of a compound material, is adjusted to the values of the attenuation coefficients given by Grodstein (1957). The exponent of the atomic number has to be changed from 2·94 to 3·4 or higher.
J, Weber, D J, van den Berge
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Determination of atomic cross-sections and effective atomic numbers for some alloys

Annals of Nuclear Energy, 2000
Abstract The transmission of gamma-rays at the energies, 81, 356, 511, 662, 835, 1274 and 1332 keV has been studied on the alloys brass, bronze, steel, aluminum–silicon and lead–antimony. The mass absorption coefficients have been measured. The total interaction cross-sections and effective atomic numbers have been determined on the basis of mixture ...
A.H. El-Kateb, R.A.M. Rizk, A.M. Abdul-Kader   +2 more
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Effective atomic numbers for materials of dosimetric interest

Radiation Physics and Chemistry, 1997
Abstract Effective atomic numbers ( Z eff ) for different materials of dosimetric interest have been calculated for total photon interaction in the energy region 1 keV–20 MeV. The calculations are made using the mass attenuation coefficients data from Tables of X-ray Mass Attenuation Coefficients and Mass Energy-absorption Coefficients 1 keV to ...
T.Kiran Kumar, K.Venkata Reddy
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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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Energy dependence of the effective atomic number of alloys

International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes, 1991
Abstract To investigate the variation of effective atomic number ( Z eff) of alloys with photon energy, the Z eff of eight different alloys (tungsten steel, monel metal, solder, bell metal, bronze aluminium, bronze ordinary, platinum-rhodium-I and platinum-rhodium-II) have been studied for the total and partial photon interaction processes over ...
Gurmel S. Mudahar, Makhan Singh, Gurbakhash Singh   +2 more
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Effective Atomic Numbers of Heterogeneous Materials

Nature, 1965
FOR a single element, the three γ-ray processes—photoelectric, Compton and pair production, can be expressed as a function of photon energy hν and the atomic number Z of the element. At a given photon energy, the interaction is proportional to Zn where n is between 4 and 5 for the photoelectric effect, 1 for the Compton effect, and 2 for pair ...
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Odd-even effects for number of atoms in antiferromagnetic atomic chains on ferromagnetic substrate

Physics of the Solid State, 2010
The ground state of an antiferromagnetic atomic chain on a ferromagnetic substrate has been studied taking into account the single-ion anisotropy energy. Qualitatively different behavior of even and odd atomic chains has been demonstrated. A phase diagram in terms of chain length-ferromagnet exchange field has been constructed.
A. A. Berzin, A. I. Morosov, A. S. Sigov
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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, N. M. Badiger
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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 ...
Tianyu, Liu, Guobin, Hong, Wenli, Cai
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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.
L.C. Cusachs, H.S. Aldrich
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