Results 261 to 270 of about 14,777,258 (301)

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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Effective atomic numbers of alloys from bremsstrahlung measurements

Il Nuovo Cimento B, 1977
The effective atomic numbers of three alloys Cu-Ag, Cu-Sn and Sn-Pb were determined by measuring the external-bremsstrahlung (EB) total yields produced in those alloys and also in the constituent elements due to the stoppage in them of the continuous beta-radiation from32P,45Ca,169Er and185W.
V. V. V. Subrahmanyam, K. Narasimha Murthy, D. G. S. Narayana   +2 more
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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.
P. Duvauchelle, G. Peix, D. Babot
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Effective atomic number rule to exchange energy

1995
This chapter assesses the effective atomic number rule. The effective atomic number rule applies to molecules where covalent bonding is strong and all the valence orbitals are being used in either homo- and hetero-polar covalent bonds or are occupied by non-binding electron-pairs.
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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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Measurement of effective atomic number and electron density using an EMI scanner

Neuroradiology, 1976
Computed tomography, employing an EMI scanner at two beam energies, can be used to obtain information about the electron density and the effective atomic number of materials. The theory which is discussed has been verified experimentally and then applied in the investigation of some brain tumours in vivo.
R A, Rutherford, B R, Pullan, I, Isherwood   +2 more
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Effective atomic number and density determination of rocks by X-ray microtomography

Micron, 2015
Microtomography, as a non-destructive technique, has become an important tool in studies of internal properties of materials. Recently, interest using this methodology in characterizing the samples with respect to their compositions, especially rocks, has grown.
Eduardo Inocente, Jussiani, Carlos Roberto, Appoloni   +1 more
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Determination of the effective atomic numbers of light composite materials

2009 IEEE Intrumentation and Measurement Technology Conference, 2009
The analysis of physical and chemical characteristics of materials (composite or not) via the determination of change in the effective atomic number (Zeff) can be performed by measuring the relation between the intensities of γ-rays under coherent (Rayleigh) and inelastic (Compton) scattering.
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Atomic-number dependence of relativistic effects on chemical bonding

2000
Abstract The Atomic-number dependence of the relativistic effects on chemical bonding has been studied using the difference (ΔAPB) in the bond overlap populations between the relativistic and nonrelativistic DV-Xα calculations for various XH diatomic hydrides (XCu, Ag, and Au) and XF 6 hexafluorides (XS, Se, Mo, Ru, Rh, Te, W, Re, Os, Ir, Pt, U ...
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The Effective Atomic Number

Radiation Research, 1957
T, HENRIKSEN, J, BAARLI
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