科研之友
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摘要
The absolute values of the mass attenuation coefficients have been measured at sixty two photon energies across the L-i (i=1-3) sub-shell absorption edges of Dy-66 covering the region 7.6-14.0 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 7.6-14.0 key, 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 L-i (i=1-3) sub-shell photoionization cross sections, (sigma(P)(Li))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 (4).,(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 - 14.0 key included in this study. However, at photon energies up to few eV above the Li edges, the deduced (sigma(P)(Li))exp(i=1-3) values are found to be significantly higher (up to 32%) than both the sets of theoretical values.
- 出版日期2017-7
