Results 301 to 310 of about 791,939 (337)

Effective Atomic Numbers of Low-Z Compounds for Photon Interaction

Nuclear Science and Engineering, 1997
Effective atomic numbers are derived for the low-Z compounds polyethylene, polycarbonate, Teflon, Mylar, polystyrene, and polyvinyl chloride for total photon interaction in the 10- to 20000-keV energy region. The number generally decreases and then increases with increasing energy.
S. Guru Prasad, K. Parthasaradhi, W. D. Bloomer   +2 more
openaire   +1 more source

Photon attenuation coefficient and effective atomic number study of cements

Applied Radiation and Isotopes, 1993
Abstract The mass attenuation coefficients μ c ρ and the effective atomic numbers of four different cements have been calculated for total and partial photon interaction processes in the energy range 0.001–100,000 MeV. Small variations were noted in the mass attenuation coefficients due to chemical composition of cements for total and ...
G.S. Bhandal, K. Singh
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Effective density and atomic number determined from diffraction profiles

SPIE Proceedings, 2006
X-ray diffraction (XRD) profiles are conventionally used to determine lattice spacings via Bragg's law in order to characterize crystalline materials. It does not appear to be widely known that they also permit compositional information, such as effective atomic number and a density descriptor, to be determined from materials having little or no ...
openaire   +1 more source

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 ...
openaire   +1 more source

The Effective Atomic Number

Radiation Research, 1957
T, HENRIKSEN, J, BAARLI
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Effective Atomic Numbers for Fe–Mn Alloy Using Transmission Experiment

Chinese Physics Letters, 2007
The effective atomic numbers (Zeff) and effective electron density (Ne) for Fe–Mn alloy with different Mn contents are calculated using the mass attenuation coefficients μ/ρ obtained via XCOM in the photon energy range of 1 keV–1 GeV. The results are compared with the values measured at the photon energy of 662, 1170 and 1332 keV.
openaire   +2 more sources

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.
openaire   +1 more source

Magic Numbers in Atomic Clusters: Energetic, Electronic and Structural Effects

1992
The subject of magic numbers in clusters has been one of long-standing interest since early observation of pronounced intensity anomalies seen in the mass spectral distributions of molecular and atomic systems (1–10). Early observations in the case of water (2,3)revealed a particularly stable entity involving 21 molecules bound to a proton, which was ...
openaire   +1 more source

Cancer treatment and survivorship statistics, 2022

Ca-A Cancer Journal for Clinicians, 2022
Kimberly D Miller, Leticia M Nogueira, Angela B Mariotto   +2 more
exaly  

Atomic Number Effects in Microprobe Analysis

1963
D.M. POOLE, P.M. THOMAS
openaire   +1 more source