Band reject filtration of the excitation spectrum at energy dispersive X-ray spectroscopy of weak signals

Tur’yanskii, A. G.; Gizha, S. S.; Senkov, V. M.; Pirshin, I. V.; Stanishevskii, Ya. M.

doi:10.1134/s0021364016180120

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…At the same time, there are a few important analytical problems with the use of broadband spectrum, in which it is advisable to filter selectively the relatively narrow bands of the spectral width of not more than 0.1–1 keV. Such tasks, in particular, are (a) reducing the level of the characteristic lines of the radiation source during the energy dispersive fluorescent analysis; (b) suppressing one of the lines of the K‐series of the primary spectrum in X‐ray diffractometry of polycrystals; (c) creating a spectral valley in the excitation spectrum to increase the sensitivity of detection of weak fluorescent lines; and (d) smoothing the primary spectrum in static energy dispersive diffractometry and reflectometry. The band‐reject filter may be also of interest when working with synchrotron sources in cases where a polychromatic spectrum containing several harmonics of the undulator is used to obtain a certain ratio of the intensity of harmonics or to suppress one of them …”

Section: Introductionmentioning

confidence: 99%

Band‐reject‐filtering X‐ray spectra by mosaic structures of pyrolytic graphite

Turyanskiy

Gizha

2020

X-Ray Spectrometry

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The possibility of effective band-reject filtration of intense spectral lines in Xray spectra and the creation of deep spectral valleys in the continuous spectrum by diffraction extinction was shown. Optimum material for band-reject filters in the energy range E > 6 keV is highly oriented pyrolytic graphite (HOPG). The filtering scheme in the form of an echelon arrangement of HOPG films is proposed, which suppresses the negative effect of multiple reflections due to diffraction extinction. The full width at half minimum of the spectral valleys can vary from tens of electronvolt to several kiloelectron volt depending on the HOPG mosaic spread, HOPG filters arrangement, and rejected energy region. At the energy range E of~10 keV, the spectral density attenuation value may be of order 10 −3 and lower. The obtained results can be used in various fields of X-ray spectrometry, as well as in static energy dispersive diffractometry and reflectometry. K E Y W O R D Sband rejection, HOPG, mosaic structures, X-ray extinction, X-ray filter

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Section: Introductionmentioning

confidence: 99%

Band‐reject‐filtering X‐ray spectra by mosaic structures of pyrolytic graphite

Turyanskiy

Gizha

2020

X-Ray Spectrometry

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“…It will lead to reduction of the transmitted intensity. This issue is well known in X‐ray spectroscopy and is called “diffraction loss” or “glitch.” In the present paper we will measure the magnitude of the described effect for different sets of monocrystalline diamond refractive lenses.…”

Section: Introductionmentioning

confidence: 99%

Spectral X‐Ray Glitches in Monocrystalline Diamond Refractive Lenses

Polikarpov

Emerich

Klimova

et al. 2017

Physica Status Solidi (b)

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X-ray refractive lenses are widely used optical devices at today synchrotron X-ray sources. In the present paper we demonstrate negative influence of the X-ray diffraction on optical properties of monocrystalline X-ray refractive lenses in operation. Several types of single-crystal diamond lenses were studied in X-ray spectroscopy mode at the European Synchrotron Radiation Facility. X-rays were propagating through individual lenses, stacked together in a row, and the transmitted intensity was measured at different energies. While using the stack of crystallographically co-aligned lenses, we obtained the strong maximal reduction of 35% in an intensity of the outgoing signal. The effect was caused by diffraction losses in the single-crystal diamond and also called "X-ray glitch." The magnitude of the effect was then minimized down to $10% by use of stacks with different crystallographic orientation of individual lenses inside. At the same time, X-ray glitches did not affect any focal spot's size or shape while only arousing the darkening of the focal spot at exact energies of X-ray glitches.

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“…In the soft part of the spectrum, multiple increase of the signal‐to‐noise ( S/N ) ratio is usually achieved by transmission of a primary beam through an absorption filter . As it has been recently shown in, multiple suppression of the background level in the spectral bandwidth of about 1 keV can be obtained by the band‐reject HOPG filter exploiting diffraction extinction. For further sensitivity enhancement, various measurement schemes are applied with polarization or monochromatization of the primary beam .…”

Section: Introductionmentioning

confidence: 99%

The energy dispersive scheme of X‐ray fluorescence analysis with a crystal polarizer and polycapillary optics

et al. 2017

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The efficiency of the polarization scheme based on polycapillary optics and a diamond crystal polarizer was demonstrated. The scheme provides suppression of the background of scattered radiation in measuring X‐ray fluorescence spectra. A quasi‐parallel X‐ray beam with an angular divergence of 4.2 mrad was formed by a microfocus source with a copper anode and polycapillary half‐lens. Simultaneous polarization and monochromatization of radiation was obtained with a crystal of natural diamond, which was set at the diffraction reflection (113). The degree of polarization of CuKα1 spectral line and the maximum radiation flux were respectively equal to 99.86% and 5 · 106 photon/s. In the direction orthogonal to the plane of diffraction, the maximum attenuation of the background was up to 19 dB.

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Band reject filtration of the excitation spectrum at energy dispersive X-ray spectroscopy of weak signals

Cited by 8 publications

References 12 publications

Band‐reject‐filtering X‐ray spectra by mosaic structures of pyrolytic graphite

Band‐reject‐filtering X‐ray spectra by mosaic structures of pyrolytic graphite

Spectral X‐Ray Glitches in Monocrystalline Diamond Refractive Lenses

The energy dispersive scheme of X‐ray fluorescence analysis with a crystal polarizer and polycapillary optics

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