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Self‐absorption of As, Se and Br for their Kβ 2 and Kβ 1,3 radiations and its effect on intensity ratio measurements (chemical state analyses of As, Se and Br by X‐Ray Method. 3 )
Author(s) -
Iwatsuki Masaaki,
Fukasawa Tsutomu
Publication year - 1982
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.1300110310
Subject(s) - absorption (acoustics) , analytical chemistry (journal) , radiation , intensity (physics) , absorption edge , chemical state , radiant intensity , chemistry , wavelength , attenuation coefficient , atomic physics , materials science , optics , nuclear magnetic resonance , physics , optoelectronics , chromatography , band gap , x ray photoelectron spectroscopy
A dependence of the observed Kβ 2 /Kβ 1,3 intensity ratios of As, Se and Br on their concentrations in measured samples was found in a study of the use of these ratios in chemical state analysis. This paper includes the experiments and discussion on this concentration effect, which is caused by the large difference between the self‐absorption coefficients of each element for its Kβ 2 and Kβ 1,3 radiations. An x‐ray spectrometer was used for the measurements of the intensity ratios and absorption coefficients. Since the Kβ 2 radiation of each element has a wavelength shorter than the Kβ 1,3 radiation and longer than the K absorption edge, the self‐adsorption coefficient of the Kβ 2 radiation was presupposed to be smaller than that of the Kβ 1,3 radiation. The results of experiments, however, were contrary to the supposition. The observed self‐absorption coefficients of these elements for their Kβ 2 radiations were 1.4–2.2 times those of their Kβ 1,3 radiations, depending on the chemical states of the elements as absorbers or x‐ray emitters. These values gave a solution to the concentration effect. The correction of the effect allows the inherent intensity ratios to be determined which may then be used for chemical state analysis.