Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5499342 | Radiation Physics and Chemistry | 2017 | 28 Pages |
Abstract
The absolute values of the mass attenuation coefficients have been measured at sixty two photon energies across the Li (i=1-3) sub-shell absorption edges of 66Dy covering the region 7.6-14.0Â keV in order to investigate the influence of near-edge processes on the attenuation coefficients. The present measured attenuation coefficients are found to be higher by up to 10% than the theoretical values evaluated from the computer code XCOM (Berger et al., 2010) and the self-consistent Dirac-Hartree-Slater (DHS) model based values tabulated by Chantler (1995) over the energy region 7.6-14.0Â keV, except at energies in vicinity (few eV) of the Li (i=1-3) sub-shell absorption edge energies where the measured values are significantly higher (up to 37%) than both the sets of theoretical values. Further, the Li (i=1-3) sub-shell photoionization cross sections, (ÏLiP)exp, deduced from the present measured mass attenuation coefficients are compared with the non-relativistic Hartree-Fock-Slater (HFS) model based values tabulated by Scofield (1973) and those evaluated from the theoretical total photoionization attenuation coefficients tabulated by Chantler (1995). The deduced (ÏLiP)exp(i=1-3) values are found to be in better agreement with those evaluated from the tabulations given by Chantler (1995) than the values given by Scofield (1973) over the energy region 7.8 - 14.0Â keV included in this study. However, at photon energies up to few eV above the Li edges, the deduced (ÏLiP)exp(i=1-3) values are found to be significantly higher (up to 32%) than both the sets of theoretical values.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
Rajnish Kaur, Anil Kumar, Janos Osan, M. Czyzycki, A.G. Karydas, Sanjiv Puri,