Updated database and new empirical values for K-shell fluorescence yields

Kahoul, A.; Aylıkçı, V.; Aylikçi, N. Küp; Cengi̇z, E.; Apaydın, G.

doi:10.1016/j.radphyschem.2012.03.006

Cited by 39 publications

(26 citation statements)

References 59 publications

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“…The total vacancy transfer probabilities for these elements determined using K values given by Kahoul et al [14] and Bambynek et al [15] have a maximum uncertainty of 3.7% and 2.5%, respectively, owing to the uncertainty in intensity ratios as well as those in K values.…”

Section: Resultsmentioning

confidence: 99%

“…The weighted average values of the K shell X-ray intensity ratios for Fe, Ag, and Te are presented in Table 1. The vacancy transfer probabilities of these elements have been calculated using (2) taking the K shell XRF yield ( k ) values from Kahoul et al [14] and Bambynek et al [15] for all four trials and weighted averages of the values are presented in Table 2.…”

Section: Methodsmentioning

confidence: 99%

“…In the present investigation, we are using the K values from Kahoul et al [14] and Bambynek et al [15] to calculate K-L total vacancy transfer probabilities. …”

Section: Brief Theorymentioning

confidence: 99%

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K shell X-ray intensity ratios and vacancy transfer probabilities of Fe, Ag, and Te following electron capture decay

GeorgeLinu

JosephDaisy

2014

Can. J. Phys.

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The K shell X-ray photons of Fe, Ag, and Te following the electron capture decay of Co 57 , Cd 109 , and I 125 , respectively, were detected using Si(Li) detector coupled to PC-based 8k multichannel analyzer employing a simple method suggested earlier by our group. The calculated K shell X-ray intensity ratios and vacancy transfer probabilities for these elements are compared with the theoretical values predicted by Scofield and with others' experimental values obtained via photoionization. It is found that the ⌲ ␤ to ⌲ ␣ X-ray intensity ratio of Fe is lower by 4.0%, while that of Ag and Te are greater by 7.9% and 19.1%, respectively, from the theoretical values. These deviations may be attributed to the exchange interactions occurring between the 3p-3d shell electrons as well as the recoil effect of the nucleus due to neutrino emission. PACS Nos.: 32.30.Rj, 32.80.Fb, 78.70.En. Résumé :Les photons X de la couche K dans le Fe, l'Ag et le Te, suivant la capture électronique par le Co 57 , le Cd 109 et l'I 125 sont détectés ici par des détecteurs Si(Li) couplés à un analyseur multicanaux 8k qui emploie une méthode simple proposée plus tôt par notre groupe. Nous comparons les rapports d'intensité des rayons X de la couche K et les probabilités de transfert de lacunes, avec les valeurs théoriques de Scofield et avec d'autres résultats expérimentaux obtenus de la photo-ionisation. Nous trouvons que le rapport d'intensité K ␤ sur K ␣ dans le Fe est 4% plus faible que la valeur théorique, alors qu'il est plus élevé de 7,9 % et 19,1 % dans l'Ag et le Te, respectivement. Ces déviations peuvent être attribuées aux interactions d'échange dans les couches électro-niques 3p-3d, ainsi qu'aux effets de recul du noyau suite à l'émission du neutrino. [Traduit par la Rédaction]

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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K shell X-ray intensity ratios and vacancy transfer probabilities of Fe, Ag, and Te following electron capture decay

GeorgeLinu

JosephDaisy

2014

Can. J. Phys.

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“…The fluorescence yield for tellurium has been measured several times, with a weighted average quoted to ±3.1% [14]. Furthermore, world data for fluorescence yields have also been evaluated systematically as a function of Z [15] for all elements with 10 ≤ Z ≤ 100, and ω K values have been recommended for each element in this range.…”

Section: Measurement Overviewmentioning

confidence: 99%

Precise measurement of αK for the 88.2-keV M4 transition in Te127 : Test of internal-con

et al. 2017

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We have measured the K-shell internal conversion coefficient, αK , for the 88.2-keV M 4 transition from the 106-day isomer to the ground state in 127 Te to be 484(6). When compared with Dirac-Fock calculations of αK , this result agrees well with the version of the theory that incorporates the effect of the K-shell atomic vacancy and disagrees with the one that does not. As a byproduct of this measurement, we have determined the beta branching from the isomer to be 2.14(3)%.

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“…The next example is the K‐shell fluorescence yield, where a new compilation became available . The compilation covers only the last decade.…”

Section: Examples Of Data Scattermentioning

confidence: 99%

Is a sufficient measure of the standard uncertainty in X‐ray spectroscopy?

Papp

Maxwell²

2017

X-Ray Spectrometry

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There is a magnitude larger scatter in the experimental data of fundamental parameters than the claimed error estimate. We give examples from recent compilations of excitation and decay parameter values for the untenable large scatters, indicating methodological problems. One is the improper use of uncertainty estimation. The measured spectrum is not expected to follow Poisson distribution. We report proper statistical uncertainty calculations. It implies a two to five times larger uncertainty but still does not account for the large scatter. The other possible explanation could be rooted in the ill-posed problem of exponential analysis, as radiation measurement belongs to this category. We give evidence from particle-induced X-ray emission and X-ray fluorescence for additional exponential terms, thus leading to multi-exponential analysis. This could explain the large scatter, as the usual square root of counts rule cannot be used for the standard uncertainty. We present a novel approach where discriminators are used to reduce the number of exponentials and the discriminated events are also processed and collected into a separate spectrum. Analyzing both spectra and the live time and dead time clocks allows the determination of the true input counts. It is a non-extended dead time approach. With this approach, we have a much reduced statistical uncertainty, and both the total spectrum and the fractional spectrum have the same uncertainty. As an independent quality assurance tool, the time interval histogram analysis is also presented.

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Updated database and new empirical values for K-shell fluorescence yields

Cited by 39 publications

References 59 publications

K shell X-ray intensity ratios and vacancy transfer probabilities of Fe, Ag, and Te following electron capture decay

K shell X-ray intensity ratios and vacancy transfer probabilities of Fe, Ag, and Te following electron capture decay

Precise measurement of αK for the 88.2-keV M4 transition in Te127 : Test of internal-con

Is a sufficient measure of the standard uncertainty in X‐ray spectroscopy?

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