X-ray flux concentrating optics for improving the performance of light element energy dispersive spectroscopy

1998 ◽  
Author(s):  
David B. O'Hara
Keyword(s):  
Energy Dispersive Spectroscopy ◽  
Light Element ◽  
Energy Dispersive ◽  
X Ray ◽  
Title X

Do Ultra-Thin Polymer X-Ray Windows Leak Water Vapor?

1999 ◽  
Vol 5 (S2) ◽  
pp. 588-589
Author(s):  
A. Nielson ◽  
J. Thorne
Keyword(s):  
Water Vapor ◽  
Thin Layer ◽  
Liquid Nitrogen ◽  
Energy Dispersive Spectroscopy ◽  
Light Element ◽  
Energy Dispersive ◽  
Nitrogen Form ◽  
X Ray ◽  
The Past ◽  
Thin Polymer

Ultra-thin polymer x-ray windows have been developed for energy dispersive spectroscopy (EDS) that enable analysis of the elements lighter in mass than sodium while protecting the detector from light and gases. Windowless detectors produce the ultimate in detector sensitivity, however that sensitivity is lost when ice and other contaminants form on the detector. Polymer windows have had a problem with icing in the past, however modern ultra-thin polymer windows contain metalized layers to prevent the diffusion of water. Nevertheless, over the course of time it has been observed that some detectors with polymer windows that are kept continually cool with liquid nitrogen form a thin layer of ice that attenuates light element sensitivity. The source of this water has been hypothesized to be a gradual leak of water vapor through the polymer x-ray window. This hypothesis has been questioned on the basis that the windows were helium leak tight to 1 x 10−9 mbar L/sec and helium is a smaller molecule than water.

Elemental hair analysis using nuclear microscopy and X-ray energy dispersive spectroscopy

The Analyst ◽  
1995 ◽  
Vol 120 (3) ◽  
pp. 783 ◽  
Author(s):  
Jill A. Cargnello ◽  
Jonathan J. Powell ◽  
Richard P. H. Thompson ◽  
Peter R. Crocker ◽  
Frank Watt
Keyword(s):  
Energy Dispersive Spectroscopy ◽  
Hair Analysis ◽  
Energy Dispersive ◽  
X Ray ◽  
Nuclear Microscopy

Composition Analysis of Ge/Si1-xGex: C Buffer on Silicon Measured by Planar Scanning Energy Dispersive Spectroscopy

2011 ◽  
Vol 383-390 ◽  
pp. 7619-7623
Author(s):  
Z Z Lu ◽  
F. Yu ◽  
L. Yu ◽  
L. H. Cheng ◽  
P. Han
Keyword(s):  
Energy Dispersive Spectroscopy ◽  
Chemical Vapor ◽  
Energy Dispersive ◽  
Composition Analysis ◽  
X Ray Diffraction ◽  
Si Substrate ◽  
Composition Distribution ◽  
X Ray ◽  
Cvd Method ◽  
Substrate Structure

In this work, Si, Ge element composition distribution in Ge /Si1-xGex:C /Si substrate structure has been characterized and modified by planar scanning energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The Ge /Si1-xGex:C /Si substrate samples are grown by chemical vapor deposition (CVD) method. The accuracy of EDS value can be improved by ~ 32%. And the modified EDS results indicate the Ge distribution in the Ge/Si1-xGex:C/Si sub structure.

AN EVALUATION OF THE USE OF ELYTRA AND BODIES IN X-RAY ENERGY-DISPERSIVE SPECTROSCOPIC STUDIES OF THE RED TURNIP BEETLE, ENTOMOSCELIS AMERICANA (COLEOPTERA: CHRYSOMELIDAE)

1980 ◽  
Vol 112 (6) ◽  
pp. 609-614 ◽  
Author(s):  
W. J. Turnock ◽  
G. H. Gerber ◽  
D. U. Sabourin
Keyword(s):  
Discriminant Analysis ◽  
Energy Dispersive Spectroscopy ◽  
Spectroscopic Studies ◽  
Energy Dispersive ◽  
Spectroscopy Technique ◽  
X Ray ◽  
Insect Dispersal ◽  
Canonical Variables ◽  
The Mean ◽  
Individual Variables

AbstractSamples of the bodies and elytra of Entomoscelis americana Brown were analyzed separately by X-ray energy-dispersive spectroscopy. Discriminant analysis revealed that the chemoprints of the bodies of newly-emerged beetles (1 wk old) were distinct from those of post-aestivation beetles (9- to 10-wk old). However, the chemoprints of the elytra of newly-emerged and post-aestivation beetles were not as different as those of the bodies as demonstrated by the overlap in the plot of the first two canonical variables. The variances of the mean difference of individual variables between newly-emerged and post-aestivation groups generally were smaller for elytra than for bodies. This suggests that the chemoprints of the elytra of E. americana are more stable than those of the bodies and consequently the elytra should be more suitable than the bodies in insect dispersal studies utilizing the X-ray energy-dispersive spectroscopy technique.

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