Approaches for theoretical and experimental determinations of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>K</mml:mi></mml:math>-shell decay rates and fluorescence yields in Ge

Sampaio, J. M.; Madeira, Teresa; Marques, J. P.; Parente, F.; Costa, Ana Maria Medeiros da; Indelicato, P.; Santos, J. P.; Lépy, Marie‐Christine; Ménesguen, Y.

doi:10.1103/physreva.89.012512

Cited by 24 publications

(17 citation statements)

References 45 publications

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“…To ensure orthogonality, no orbital relaxation was allowed between the initial and final bound state wavefunctions during the calculation of the radiationless transition rates and photoionization cross sections. These were, however, calculated using the correct transition energies obtained in previous independent calculations of initial and final state wavefunctions …”

Section: Theorymentioning

confidence: 99%

A combined experimental and theoretical approach to determine X‐ray atomic fundamental quantities of tin

et al. 2018

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The knowledge of atomic fundamental parameters, such as the mass attenuation coefficients or fluorescence yields with low uncertainties, is of decisive importance in elemental quantification involving X‐ray fluorescence analysis techniques. For example, several databases giving the mass attenuation coefficients are accessible and frequently used within a large community of users. These compilations are most often in good agreement for photon energies in the hard X‐ray ranges. However, they significantly differ for low photon energies and around the absorption edges of the elements. In the case of the fluorescence yields, some authors made a review of measured values found in the literature. However, reliable measurements are not so many illustrating the inherent difficulties. Mass attenuation coefficients of tin were determined experimentally in the photon energy range from 100 eV to 35 keV by using monochromatized synchrotron radiation at SOLEIL (France). The fluorescence yields of the 3 L‐subshells of tin were also determined using a reflection geometry setup and the X‐ray fluorescence setup of Physikalisch‐Technische Bundesanstalt. The Coster–Kronig factors for the tin L‐shells were also experimentally determined. The application of high‐accuracy experimental techniques resulted in low uncertainty mass attenuation coefficients and L‐subshell fluorescence yields that are directly compared with existing databases and with updated relativistic configuration mixing Dirac–Fock calculations including Quantum electrodynamics (QED) corrections.

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Section: Theorymentioning

confidence: 99%

A combined experimental and theoretical approach to determine X‐ray atomic fundamental quantities of tin

et al. 2018

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“…New values are obtained with a relative combined standard uncertainty below 2%. We discussed in previous papers the determination of the mass attenuation coefficients for copper and zinc, nickel, germanium, tin, and bismuth . As an example, values for silver are presented as they appear on the website for users on Figure .…”

Section: Comparison Of Mass Attenuation Measurements With Epdl97mentioning

confidence: 99%

Advances in the measurements of the mass attenuation coefficients

2018

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The knowledge of atomic fundamental parameters, such as mass attenuation coefficients or fluorescence yields with low uncertainties, is of decisive importance in elemental quantification involving X‐ray fluorescence analysis techniques. Several databases providing the mass attenuation coefficients are accessible and frequently used within a large community of users. These compilations are most often in good agreement for photon energies in the hard X‐ray ranges. However, they significantly differ for low photon energies and around the absorption edges of the elements. Mass attenuation coefficients of several elements were determined experimentally in the photon energy range from 100 eV to 35 keV by using monochromatized radiation at the SOLEIL synchrotron (France). The application of high‐accuracy experimental techniques resulted in low uncertainty mass attenuation coefficients. The results are compared with tabulated data.

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“…These coefficients were obtained following an experimental procedure previously established and validated for similar measurements on germanium, copper and other metallic targets. [10][11][12] Mass attenuation coefficients, μ ρ E ð Þ, were measured in transmission mode using a monochromatic parallel photon beam with energy E under normal incidence to the sample with thickness x. The principle of the measurement consists in measuring the intensity of photon flux before the sample, I 0 (E), and immediately after it I(E).…”

Section: Mass Attenuation Coefficientsmentioning

confidence: 99%

“…[10,11] In a second step, the fluorescence yields were determined in a traditional experimental configuration where the target is installed at 45°b oth from the incident radiation and from an energy-dispersive detector. [12] Experimental procedure Most of the experiments were conducted at the Metrology beam line of the SOLEIL synchrotron facility (proposal 20160731). The hard X-ray branch is equipped with a double crystal monochromator (Si 111), providing monochromatic radiation with energies in the 3.5 to 35-keV range.…”

Section: Introductionmentioning

confidence: 99%

Measurement of K fluorescence yields of niobium and rhodium using monochromatic radiation

et al. 2017

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Both reactions Nb-93(n,n 0 )Nb-93 m and Rh-103(n,n 0 )Rh-103 m are of particular importance for dosimetry in reactor, and the measurement of the activity of Nb and Rh dosimeters provides the basic data that can be traced back to the reactor operating information. These radionuclides emit only X-rays of which emission intensities in recommended data are determined thanks to the γ-ray transition probabilities and fluorescence yield values. In general, the knowledge of fluorescence yields is rather poor and based on old measurements. Nowadays, the use of tunable monochromatic X-ray sources allows performing optimized measurements. In a first step, accurate values of the attenuation coefficients are measured at the metrology beam line of the SOLEIL synchrotron, using procedures such as optimized for similar measurements. In a second step, the fluorescence yields are determined using experimental approaches in a traditional experimental configuration. For both materials, several incident energies are used to get experimental spectra with energy-dispersive spectrometer. The peaks of interest are processed using the COLEGRAM software, which allows detailed fitting of the peak shape. The K fluorescence yields are derived with about 2% relative uncertainty.

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Approaches for theoretical and experimental determinations ofK-shell decay rates and fluorescence yields in Ge

Cited by 24 publications

References 45 publications

A combined experimental and theoretical approach to determine X‐ray atomic fundamental quantities of tin

A combined experimental and theoretical approach to determine X‐ray atomic fundamental quantities of tin

Advances in the measurements of the mass attenuation coefficients

Measurement of K fluorescence yields of niobium and rhodium using monochromatic radiation

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