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Title: Germanium Collimating micro-Channel Arrays For High Resolution, High Energy Confocal X-ray Fluorescence Microscopy

Authors:
; ; ; ; ;  [1];  [2];  [2];  [2];  [2]
  1. (Saskatchewan)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
NSFOTHER
OSTI Identifier:
1333941
Resource Type:
Conference
Resource Relation:
Conference: Upton, NY
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Agyeman-Budu, David N., Choudhury, Sanjukta, Coulthard, Ian, Gordon, Robert, Hallin, Emil, Woll, Arthur R., CHESS), CLS), Cornell), and Simon). Germanium Collimating micro-Channel Arrays For High Resolution, High Energy Confocal X-ray Fluorescence Microscopy. United States: N. p., 2017. Web. doi:10.1063/1.4961132.
Agyeman-Budu, David N., Choudhury, Sanjukta, Coulthard, Ian, Gordon, Robert, Hallin, Emil, Woll, Arthur R., CHESS), CLS), Cornell), & Simon). Germanium Collimating micro-Channel Arrays For High Resolution, High Energy Confocal X-ray Fluorescence Microscopy. United States. doi:10.1063/1.4961132.
Agyeman-Budu, David N., Choudhury, Sanjukta, Coulthard, Ian, Gordon, Robert, Hallin, Emil, Woll, Arthur R., CHESS), CLS), Cornell), and Simon). Wed . "Germanium Collimating micro-Channel Arrays For High Resolution, High Energy Confocal X-ray Fluorescence Microscopy". United States. doi:10.1063/1.4961132.
@article{osti_1333941,
title = {Germanium Collimating micro-Channel Arrays For High Resolution, High Energy Confocal X-ray Fluorescence Microscopy},
author = {Agyeman-Budu, David N. and Choudhury, Sanjukta and Coulthard, Ian and Gordon, Robert and Hallin, Emil and Woll, Arthur R. and CHESS) and CLS) and Cornell) and Simon)},
abstractNote = {},
doi = {10.1063/1.4961132},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 22 00:00:00 EST 2017},
month = {Wed Feb 22 00:00:00 EST 2017}
}

Conference:
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  • Confocal X-ray fluorescence imaging (CXFI) and confocal X-ray absorption spectroscopy (CXAS) respectively enable the study of three dimensionally resolved localization and speciation of elements. Applied to a thick sample, essentially any volume element of interest within the X-ray fluorescence escape depth can be examined without the need for physical thin sectioning. To date, X-ray confocal detection generally has employed a polycapillary optic in front of the detector to collect fluorescence from the probe volume formed at the intersection of its focus with the incident microfocus beam. This work demonstrates the capability of a novel Collimating Channel Array (CCA) optic inmore » providing an improved and essentially energy independent depth resolution approaching 2 μm. By presenting a comparison of elemental maps of archaeological bone collected without confocal detection, and with polycapillary- and CCA-based confocal detection, this study highlights the strengths and limitations of each mode. Unlike the polycapillary, the CCA shows similar spatial resolution in maps for both low (Ca) and high (Pb and Sr) energy X-ray fluorescence, thus illustrating the energy independent nature of the CCA optic resolution. While superior spatial resolution is demonstrated for all of these elements, the most significant improvement is observed for Ca, demonstrating the advantage of employing the CCA optic in examining light elements. In addition to CXFI, this configuration also enables the collection of Pb L3 CXAS data from micro-volumes with dimensions comparable to bone microstructures of interest. Our CXAS result, which represents the first CCA-based biological CXAS, demonstrates the ability of CCA optics to collect site specific spectroscopic information. The demonstrated combination of site-specific elemental localization and speciation data will be useful in diverse fields.« less
  • First results of combining X-ray micro-computed tomography ({mu}CT), confocal laser-scanning microscopy (CLSM) and {sup 14}C-poly-methyl-methacrylate ({sup 14}C-PMMA) impregnation techniques in the study of granitic rock samples are reported. Combining results of {mu}CT and CLSM with those of the {sup 14}C-PMMA technique, the mineral-specific porosity and morphology of the open pore space, as well as its connectivity, could be analyzed from a micrometer up to a decimeter scale. Three different types of granite were studied. In two cases part of the micro-fissure and pore apertures were found to be in a micrometer scale, but in one case all grain-boundary openings weremore » below the detection limit. Micrometer-scale apertures could be analyzed by CLSM and {mu}CT. The benefit of {mu}CT is that it can also provide the heterogeneous distribution of minerals in 3D. The 2D porosity distributions in the mineral phases, consisting of nanometer-scale pores, could be measured by the {sup 14}C-PMMA method together with the micro-fissures. This method does not, however, give the exact pore apertures. The limitations and applicability of the methods are discussed. (authors)« less