New developments of X-ray fluorescence imaging techniques in laboratory

Tsuji, Kouichi; Matsuno, T.; Takimoto, Yuki; Yamanashi, Masaki; Kometani, Noritsugu; Sasaki, Y.; Hasegawa, Takeshi; Kato, S.; Yamada, Takashi; Shoji, Takashi; Kawahara, Naoki

doi:10.1016/j.sab.2015.09.001

Cited by 49 publications

(26 citation statements)

References 57 publications

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“…Micro‐X‐ray fluorescence (micro‐XRF) can be used to create relative element localization spatial maps in situ, either with a laboratory X‐ray tube or synchrotron radiation source . However, there are still some challenges for analyzing interface samples, such as matrix correction .…”

Section: Introductionmentioning

confidence: 99%

Matrix correction with Compton to Rayleigh ratio in a plant–soil–rock interface analysis using a laboratory micro‐XRF

Shen¹,

Luo²,

Song³

et al. 2019

X-Ray Spectrometry

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Biogeochemistry interface process in a plant–soil (rock) system normally takes a key role in environmental processes. It involves complex mediums relating with complex crucial physical, chemical, and biological interactions. Accurate description of element distribution characteristics in interfaces and combination media is the prerequisite for revealing elements transfer and transformation processes. In situ micro‐X‐ray fluorescence is used here to describe the localizations of elements in a bryophyte–soil–rock interface involving biological (plant) and geological (soil and rock) matrixes. It is shown that matrix effects get great influence on the localization characteristics in this interface. Spectra without matrix corrections shows that Zn, Cu, Fe, Ca, and K reach maximum concentrations in different interface layers. Compton to Rayleigh ratio (Com/Ray), relating with mean atomic number (mean Z) and mass attenuation coefficients, has been applied in matrix correction, whereas other correction methods like multiplied or divided by Com or Ray were compared here too. The results show that the correction method with Ray*Ray/Com is more suitable for describing reasonable Ca, Mn, Fe, Zn, Cu, and Pb localization characteristics in this interface, whereas correction with Ray/Com is better for K. The localization characters after ideal corrections show that K, Ca, Pb, Zn, and Cu reach their maximum peaks at the soil layer in the interface, which are much more reasonable than the results without corrections.

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Section: Introductionmentioning

confidence: 99%

Matrix correction with Compton to Rayleigh ratio in a plant–soil–rock interface analysis using a laboratory micro‐XRF

Shen¹,

Luo²,

Song³

et al. 2019

X-Ray Spectrometry

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“…By using an X‐ray focusing lens, XRF analysis of small regions is possible. Polycapillary optics produces an X‐ray beam with a diameter of several tens of micrometers in combination with a microfocused X‐ray tube . To achieve the elemental distributions, micro‐XRF analysis is also applied as the sample is scanned.…”

Section: Introductionmentioning

confidence: 99%

“…The sample is mounted on a translation stage for microanalysis, whereas the X‐ray tube and the focusing optics are fixed. The intensity of each peak of interest in the X‐ray spectra is registered at the corresponding positions, and the elemental mapping is displayed . The assessment of the chemical composition of geological deposits (e.g., sediment, soil, and rock) has a variety of applications.…”

Section: Introductionmentioning

confidence: 99%

Characterization of carbonate rocks through X‐ray microfluorescence and X‐ray computed microtomography

et al. 2019

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Carbonate rocks play an important role in petroleum geology by acting as reservoir rocks, generators, and even hydrocarbon sealants, accounting for about half of the oil and gas reserves known in the world. The study of these carbonate rocks have become very important in the hydrocarbon exploration scene in Brazil because of they consist in analogous for reservoir rocks of the presalt interval. Thus, the objective of this research was to use X‐ray microfluorescence (micro‐XRF) and X‐ray microtomography analysis, as complementary techniques, in order to characterize samples of carbonate rocks in respect to their structures, textures, mineralogy, and pores. The microtomographic analyses allowed the identification of the horizontal structures as parallel lamination, horizontal, and vertical fractures filled by calcite and biotic constituents (gastropods bioclasts). Different composition of minerals were also identified, as calcite, quartz, feldspars, iron sulfides, and oxides. The porosity (ranges <1 to17%), and the high‐density elements could also be quantified, as well as their distribution in each sample. The micro‐XRF analysis present a direct relationship with the distribution of minerals that compound carbonate rocks, highlighting some structures, as well as helping to identify trace and minor elements in the carbonates (Mn, Sr, and Mg).

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“…In μ‐XRF, the micro X‐ray beam irradiates the localized point on the sample, and then, XRF analysis is performed at the localized region. An important application of μ‐XRF is elemental mapping . The sample stage is scanned with a fixed X‐ray micro beam.…”

Section: Introductionmentioning

confidence: 99%

“…An important application of μ-XRF is elemental mapping. [20] The sample stage is scanned with a fixed X-ray micro beam. XRF analysis is performed at different positions, leading to 2D XRF images.…”

Section: Introductionmentioning

confidence: 99%

Visualization method for radiographic films through silver intensity mapping using X‐ray fluorescence

et al. 2017

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Radiographic films have a large range of applications. In many of these applications, the behavior of characteristic curves is very important for assessing the image quality and radiography setup. Radiographic film digitization and visualization are always performed by light transmission, and the characteristic curve is known as a behavior of optical density as a function of the radiation exposure. Because optical density is a function of metallic silver generated by chemical development in silver halides, when an image is visualized by light transmission, a silver amount map is indirectly seen. However, this measurement is limited by the optical instrument, and a very weak light signal cannot be distinguished from background light or background noise. In this way, highly exposed films can contain areas with different silver concentrations, but this cannot be seen because the optical density measurement is limited. One of the ways through which it is possible to overcome such limitation is to use a different method for ascertaining the quantity of silver remaining on the developed films, and one of the quantitative techniques that suit this purpose is X-ray fluorescence (XRF). The purpose of this paper is applying μ-XRF so as to obtain a point-by-point silver intensity map to detect objects with low optical contrast on conventional radiographic films. The results of this work have shown a higher linear range in measurement using XRF, and as consequence, small objects and details in low-contrast or overexposed radiographic images could be visualized by the silver mapping technique, and the same results could not be achieved using light transmission methods. A first approach about spatial resolution and contrast was made showing strong and weak points of this way to scan radiographic films.

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New developments of X-ray fluorescence imaging techniques in laboratory

Cited by 49 publications

References 57 publications

Matrix correction with Compton to Rayleigh ratio in a plant–soil–rock interface analysis using a laboratory micro‐XRF

Matrix correction with Compton to Rayleigh ratio in a plant–soil–rock interface analysis using a laboratory micro‐XRF

Characterization of carbonate rocks through X‐ray microfluorescence and X‐ray computed microtomography

Visualization method for radiographic films through silver intensity mapping using X‐ray fluorescence

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