scholarly journals Preliminary investigation of changes in x-ray multilayer optics subjected to high radiation flux

1985 ◽  
Author(s):  
M. P. Hockaday ◽  
R. L. Blake ◽  
J. S. Grosso ◽  
M. M. Selph ◽  
M. M. Klein ◽  
...  
Keyword(s):  
Radiation Flux ◽  
Preliminary Investigation ◽  
High Radiation ◽  
X Ray

High radiation resistant crystals for x-ray and γ-radiation detectors

2021 ◽  
Author(s):  
Valery M. Skliarchuk ◽  
Petro M. Fochuk ◽  
Aleksey E. Bolotnikov ◽  
Ralph B. James
Keyword(s):  
Radiation Detectors ◽  
High Radiation ◽  
Γ Radiation ◽  
X Ray ◽  
Radiation Resistant

scholarly journals Preliminary investigation of chlorine speciation in zirconolite glass-ceramics for plutonium residues by analysis of Cl K-edge XANES

MRS Advances ◽  
2019 ◽  
Vol 5 (1-2) ◽  
pp. 37-43
Author(s):  
Amber R. Mason ◽  
Stephanie M. Thornber ◽  
Martin C. Stennett ◽  
Laura J. Gardner ◽  
Dirk Lützenkirchen-Hecht ◽  
...  
Keyword(s):  
Chemical Shift ◽  
Absorption Edge ◽  
Glass Ceramic ◽  
Glass Phase ◽  
Preliminary Investigation ◽  
Glass Ceramics ◽  
Local Environment ◽  
Aluminosilicate Glass ◽  
X Ray ◽  
X Ray Absorption

ABSTRACTA zirconolite glass-ceramic material is a candidate wasteform for immobilisation of chlorine contaminated plutonium residues, in which plutonium and chlorine are partitioned to the zirconolite and aluminosilicate glass phase, respectively. A preliminary investigation of chlorine speciation was undertaken by analysis of Cl K-edge X-ray Absorption Near Edge Spectroscopy (XANES), to understand the incorporation mechanism. Cl was found to be speciated as the Cl- anion within the glass phase, according to the characteristic chemical shift of the X-ray absorption edge. By comparison with Cl K-edge XANES data acquired from reference compounds, the local environment of the Cl- anion is most closely approximated by the mineral marialite, in which Cl is co-ordinate to 4 x Na and/or Ca atoms.

Hyperspectral Cathodoluminescence Imaging and Analysis Extending from Ultraviolet to Near Infrared

2012 ◽  
Vol 18 (6) ◽  
pp. 1239-1245 ◽  
Author(s):  
C.M. MacRae ◽  
N.C. Wilson ◽  
A. Torpy ◽  
C.J. Davidson
Keyword(s):  
Rare Earth ◽  
Near Infrared ◽  
Preliminary Investigation ◽  
X Rays ◽  
Spectral Mapping ◽  
X Ray ◽  
Quantitative Electron Probe Microanalysis ◽  
Uv Visible ◽  
Intense Emission ◽  
Cathodoluminescence Imaging

AbstractThe measurement of near-infrared (NIR) cathodoluminescence (CL) with sufficient sensitivity to allow full spectral mapping has been investigated through the application of optimized grating spectrometers that allow the ultraviolet (UV), visible, and NIR CL spectra to be measured simultaneously. Two optical spectrometers have been integrated into an electron microprobe, allowing simultaneous collection of hyperspectral CL (UV-NIR), characteristic X-rays, and electron signals. Combined hyperspectral CL spectra collected from two natural apatite (Ca5[PO4]3[OH,F]) samples from Wilberforce (Ontario, Canada) and Durango (Mexico) were qualitatively analyzed to identify the emission centers and then deconvoluted pixel-by-pixel using least-squares fitting to produce a series of ion-resolved CL intensity maps. Preliminary investigation of apatite has shown strong NIR emissions associated primarily with the rare-earth element Nd. Details of growth and alteration were revealed in the NIR that were not discernable with electron-induced X-ray mapping. Intense emission centers from Nd3+ and Sm3+ were observed in the spectra from both apatites, along with minor emissions from other 3+ rare-earth elements. Quantitative electron probe microanalysis was performed on points within the mapped area of the Durango apatite to produce a calibration line relating cathodoluminescent intensity of the fitted peak centered at 1,073 nm (1.156 eV) to the Nd concentration.

scholarly journals Uranium hohlraum with an ultrathin uranium–nitride coating layer for low hard x-ray emission and high radiation temperature

2015 ◽  
Vol 17 (11) ◽  
pp. 113004 ◽  
Author(s):  
Liang Guo ◽  
Yongkun Ding ◽  
Pifeng Xing ◽  
Sanwei Li ◽  
Longyu Kuang ◽  
...  
Keyword(s):  
Coating Layer ◽  
Radiation Temperature ◽  
Nitride Coating ◽  
High Radiation ◽  
X Ray ◽  
Uranium Nitride

Total Reflection X-ray Spectrometry (TXRF) for Trace Elements Assessment in Edible Clams

2014 ◽  
Vol 68 (11) ◽  
pp. 1241-1246 ◽  
Author(s):  
Eva Marguí ◽  
Alexandra de Fátima Marques ◽  
Maria de Lurdes Prisal ◽  
Manuela Hidalgo ◽  
Ignasi Queralt ◽  
...  
Keyword(s):  
Trace Elements ◽  
Preliminary Investigation ◽  
Total Reflection ◽  
Mass Spectrometry Analysis ◽  
Human Consumption ◽  
Ultratrace Analysis ◽  
Present Contribution ◽  
Analytical Methodology ◽  
Element Determination ◽  
X Ray

The present contribution presents a preliminary investigation of the chemical composition with respect to major, minor, trace, and ultratrace elements in several clam species that are frequently used for human consumption in Portuguese markets and worldwide. In order to use a simple and rapid analytical methodology for clam analysis, energy dispersive X-ray fluorescence (EDXRF) spectrometry and total reflection X-ray fluorescence (TXRF) spectrometry were selected as analytical techniques. The analytical capabilities of TXRF spectrometry were evaluated for the determination of minor and trace elements in commercial edible clams. We compared the direct analysis of powdered suspensions (using different sample amounts and dispersant agents) with the analysis of the digested samples for trace element determination. Inductively coupled plasma mass spectrometry analysis of clam digests was also performed to evaluate the analytical possibilities of TXRF spectrometry for trace and ultratrace analysis.

scholarly journals Study on Concentrating Characteristics of a Solar Parabolic Dish Concentrator within High Radiation Flux

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Qianjun Mao ◽  
Liya Zhang ◽  
Hongjun Wu
Keyword(s):  
Focal Plane ◽  
Flux Distribution ◽  
Radiation Flux ◽  
Focal Length ◽  
Thermal Conversion ◽  
High Radiation ◽  
Equal Area ◽  
Future Design ◽  
Parabolic Dish ◽  
Parabolic Dish Concentrator

Concentrating characteristics of the sunlight have an important effect on the optical-thermal conversion efficiency of solar concentrator and the application of the receiver. In this paper, radiation flux in the focal plane and the receiver with three focal lengths has been investigated based on Monte Carlo ray-tracing method. At the same time, based on the equal area-height and equal area-diameter methods to design four different shape receivers and numerical simulation of radiation flux distribution characteristics have also been investigated. The results show that the radiation flux in the focal plane increases with decreasing of the focal length and the diameter of the light spot increases with increasing of the focal length. The function of the position with a maximum of radiation flux has been obtained according to the numerical results. The results also show that the radiation flux distribution of cylindrical receiver has the best performance in all four receivers. The results can provide a reference for future design and application of concentrating solar power.

A Preliminary Investigation into the Effects of X-Ray Radiation on Superficial Cranial Vascularization

2009 ◽  
Vol 84 (5) ◽  
pp. 379-387 ◽  
Author(s):  
Sophie Desmons ◽  
Michal Heger ◽  
Caroline Delfosse ◽  
Guillaume Falgayrac ◽  
Thierry Sarrazin ◽  
...  
Keyword(s):  
Preliminary Investigation ◽  
X Ray

Preliminary investigation of a new X-ray film

1981 ◽  
Vol 14 (4) ◽  
pp. 256-260 ◽  
Author(s):  
S. Abrahamsson ◽  
O. Lindqvist ◽  
L. Sjölin ◽  
A. Wlodawer
Keyword(s):  
Preliminary Investigation ◽  
X Ray
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