K-shell fluorescence yields for elements with 6≤Z≤99

Kahoul, A.; Abassi, Amel; Deghfel, B.; Nekkab, M.

doi:10.1016/j.radphyschem.2010.11.011

Cited by 28 publications

(13 citation statements)

References 75 publications

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“…However, it is quite close to the value measured by Singh [20,32]1 and in agreement with the theoretical values, except the one computed by Walters.…”

Section: Resultssupporting

confidence: 91%

“…Indeed, the rhodium target is thicker and significantly reduces the initial beam intensity. Thus, the transmitted intensity values measured by the photodiode [21,22] 0.713 --0.730 (20) --Callan [23] -0.754 -Kostroun [24] -0.759 -Walters et al [25] -0.7788 -Bambynek et al [26] --0.748 (32) Krause [27] --0.747 Arora et al [28] 0.738 (30) --Hubbell et al [29] --0.7512 Singh et al [20,32] [20] --0.724 Schönfeld et al [30] --0.751 (4) Durak et al [31] 0.734 (28) --Han et al [19] 0.747 (60) --Kahoul et al [32] --0.73993 [33] 0.801 --Stephenson [34] 0.77 --Roos [21,22] 0.779 --0.786 (15) --Callan [23] -0.812 -Kostroun [24] -0.820 -Walters et al [25] -0.8367 -Bambynek et al [26] --0.807 (31) Krause [27] --0.808 Chen et al [35] -0.808 -Hubbell [29] --0.8086 Singh et al [20,32] [20] --0.792 Schönfeld et al [30] --0.809 (4) Kahoul et al [32] --0.80205 are closer to the background noise value than niobium, which increases the uncertainty on rhodium measurements. Tables 1 and 2 show the experimental values for niobium and rhodium obtained in this work and the comparison them with other values, experimental, theoretical or semi-empirical.…”

Section: Resultsmentioning

confidence: 99%

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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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“…However, it is quite close to the value measured by Singh [20,32]1 and in agreement with the theoretical values, except the one computed by Walters.…”

Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

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

et al. 2017

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“…This channel has a measured branching ratio of 9.7% of all ions associated with a radiative decay. It should be noted that Kα decay to a 2p −1 core-hole state followed by a secondary radiative decay to a singly charged 3s −1 state also lead to the creation of Ar + but is at least two orders of magnitudes lower than Kβ decay [20,41]. In process 2, Kα decay leads to the production of the doubly charged ion, and γ Kα is the fluorescence photon detected in coincidence with Ar 2+ in Fig.…”

Section: A Radiative Decaymentioning

confidence: 96%

“…The role played by fluorescence has been long recognized and has been studied by means of coincidence measurements between Auger electrons and fluorescence x-ray photons [18,19]. The relative weight of the radiative channel in Ar had been estimated between 8% and 14% [2,17,20]. Radiative decay pathways branch into several subchannels [21].…”

Section: Introductionmentioning

confidence: 99%

Interplay of complex decay processes after argon 1s ionization

et al. 2018

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Complex decay pathways involving radiative and nonradiative relaxation after deep core-level ionization in argon are disentangled by a unique combination of several synchrotron radiation-based spectroscopic techniques. In particular, by comparing the results obtained from electron-ion coincidence, photon-ion coincidence, and x-ray emission measurements, we are able to distinguish the final ionic states produced in the cascade decay involving Kα and Kβ radiative decay and final ionic states produced by nonradiative cascade decay. High-resolution Auger electron spectroscopy is then used as a complementary tool to identify the LMM transitions contributing to the cascade decay. Ab initio calculations are performed to identify the electronic states involved in the LMM decay.

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“…K-shell fluorescence yield ω K Several attempts were performed regarding the experimental determination of K-shell fluorescence yields. In this work, the well-known formula (8) has been used which is utilized by different authors [18][19][20][21][22][23].…”

Section: Calculation Procedures Of ω K and Kβ/kαmentioning

confidence: 99%

Effect ofpH treatment onK-shell x-ray intensity ratios andK-shell x-ray-production cross sections in ZnCo alloys

et al. 2011

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In this study, empirical and semiempirical K-shell fluorescence yields (ω K ) and Kβ/Kα intensity ratios from the available experimental data for elements with 23 Z 30 were calculated to compare them with elements in different alloys. The experimental data are fitted using the quantity [ω K /(1 − ω K )] 1/4 vs Z to deduce the empirical K-shell fluorescence yields and Kβ/Kα intensity ratios. The empirical and semiempirical K-shell fluorescence yield values were used to calculate the K x-ray-production cross-section values for pure Co and Zn elements. Also, σ Kα , σ Kβ production cross sections and Kβ/Kα intensity ratios of Co and Zn have been measured in pure metals and in different alloy compositions which have different pH values. The samples were excited by 59.5-keV γ rays from a 241 Am annular radioactive source. K x rays emitted by samples were counted by an Ultra-LEGe detector with a resolution of 150 eV at 5.9 keV. The effect of pH values on alloy compositions and the effect of alloying on the fluorescence parameters of Co and Zn were investigated. The x-ray fluorescence parameters of Co and Zn in the alloying system indicate significant differences with respect to the pure metals. These differences are attributed to the reorganization of valence shell electrons and/or charge transfer phenomena.

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K-shell fluorescence yields for elements with 6≤Z≤99

Cited by 28 publications

References 75 publications

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

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

Interplay of complex decay processes after argon 1s ionization

Effect ofpH treatment onK-shell x-ray intensity ratios andK-shell x-ray-production cross sections in ZnCo alloys

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