Photoeffect cross sections of several rare-earth elements for 323-keV photons

Umesh, T. K.; Anasuya, S. J.; Kumari, Jyoti; Gowda, Channe; Nair, K. P. Gopinathan; Gowda, Ramakrishna

doi:10.1103/physreva.45.2101

Cited by 5 publications

(2 citation statements)

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“…The details regarding the experimental set-up used, the method of data acquisition, analysis and error discussion along with the calculation of the total attenuation cross-section of these elements have been reported earlier by the authors [33][34][35][36][37].…”

Section: Methodsmentioning

confidence: 99%

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Anomalous scattering factors of some rare earth elements evaluated using photon interaction cross-sections

et al. 2003

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The real and imaginary parts, f ¼´E µ and f ¼¼´E µ of the dispersion corrections to the forward Rayleigh scattering amplitude (also called anomalous scattering factors) for the elements La, Ce, Pr, Nd, Sm, Gd, Dy, Ho and Er, have been determined by a numerical evaluation of the dispersion integral that relates them through the optical theorem to the photoeffect cross-sections. The photoeffect cross-sections are derived from the total attenuation cross-section data set experimentally determined using high resolution high purity germanium detector in a narrow beam good geometry set-up for these elements in the photon energy range 5 to 1332 keV and reported earlier by the authors. Below 5 keV, Scofield's photoeffect cross-sections compiled in XCOM program have been interpolated and used. Simple formulae for f ¼¼ in terms of atomic number and energy have also been obtained. The data cover the energy region from 6 to 85 keV and atomic number Z from 57-68. The results obtained are found to agree fairly well with the other available data.

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Section: Methodsmentioning

confidence: 99%

“…The total attenuation cross-sections were measured in the energy range 6 to 85 keV in a narrow beam good geometry set-up, by employing a high-resolution hyper-pure germanium detector [33]. Beyond 85 keV, experimental data measured earlier by two of the authors [34][35][36][37] were used. Below 6 keV, Scofield's [38] data were used.…”

Section: Introductionmentioning

confidence: 99%

Anomalous scattering factors of some rare earth elements evaluated using photon interaction cross-sections

et al. 2003

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Dispersion corrections to the forward Rayleigh scattering amplitudes around the L‐shell of tantalum and lead

Gowda

Umesh

2006

X-Ray Spectrometry

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Dispersion corrections to the forward Rayleigh scattering amplitudes of tantalum and lead in the photon energy range 6.4–24.14 keV were determined by a numerical evaluation of the dispersion integral that relates them through the optical theorem to the photoelectric cross‐sections. The photoelectric cross‐sections were extracted by subtracting the coherent and incoherent scattering contribution from the measured total attenuation cross‐section, using a high‐resolution, high‐purity germanium detector in a narrow‐beam good geometry setup. The real part of the dispersion correction to which the relativistic corrections calculated by Kissel and Pratt (S‐matrix approach) or Creagh and McAuley (multipole corrections) have been included are in better agreement with the available theoretical values than those values to which the relativistic corrections calculated by Cromer and Liberman (dipole corrections) are added. Copyright © 2006 John Wiley & Sons, Ltd.

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Photon mass attenuation coefficients, effective atomic numbers and electron densities of some thermoluminescent dosimetric compounds

et al. 2004

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Photoeffect cross sections of several rare-earth elements for 323-keV photons

Cited by 5 publications

References 5 publications

Anomalous scattering factors of some rare earth elements evaluated using photon interaction cross-sections

Anomalous scattering factors of some rare earth elements evaluated using photon interaction cross-sections

Dispersion corrections to the forward Rayleigh scattering amplitudes around the L‐shell of tantalum and lead

Photon mass attenuation coefficients, effective atomic numbers and electron densities of some thermoluminescent dosimetric compounds

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