Update On Synchrotron Radiation TXRF: New Results

1998 ◽  
Vol 524 ◽  
Author(s):  
S. Brennan ◽  
P. Pianetta ◽  
S. Ghosh ◽  
N. Takaura ◽  
C. Wiemer ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Total Reflection ◽  
Synchrotron Source ◽  
X Ray ◽  
Non Destructive

ABSTRACTSynchrotron-based total-reflection x-ray fluorescence(SR-TXRF) has been developed as a leading technique for measuring wafer cleanliness. It holds advantages over other techniques in that it is non-destructive and allows mapping of the surface. The highest sensitivity observed thus far is 3x108 atoms/cm 2 (- 3fg) for 1000 second count time. Several applications of SR-TXRF are presented which take advantage of the energy tunability of the synchrotron source or the mapping capability.

Synchrotron Radiation for Measurement of Contaminants on Silicon Surfaces

1993 ◽  
Vol 307 ◽  
Author(s):  
Michael C. Madden ◽  
David C. Wherry ◽  
Piero Pianetta ◽  
Sean Brennan
Keyword(s):  
Detection Limit ◽  
Synchrotron Radiation ◽  
Transition Metals ◽  
Atomic Number ◽  
Incident Radiation ◽  
Total Reflection ◽  
Silicon Surfaces ◽  
Synchrotron Source ◽  
X Ray

ABSTRACTThe detection limit for aluminum using total reflection x-ray fluorescence (TXRF) is approximately 100 times lower for a synchrotron source compared to a conventional source. The detection limit for transition metals is approximately 15 to 40 times lower depending on atomic number and energy of the incident radiation.

scholarly journals Synchrotron radiation X-ray tomographic microscopy (SRXTM) of brachiopod shell interiors for taxonomy: Preliminary report

2010 ◽  
pp. 109-117 ◽  
Author(s):  
Neda Motchurova-Dekova ◽  
David Harper
Keyword(s):  
Synchrotron Radiation ◽  
Three Dimensional ◽  
X Rays ◽  
X Ray ◽  
Fine Grained ◽  
Internal Structures ◽  
Efficient Alternative ◽  
Micro Tomography ◽  
Light Beams ◽  
Non Destructive

Synchrotron radiation X-ray tomographic microscopy (SRXTM) is a non-destructive technique for the investigation and visualization of the internal features of solid opaque objects, which allows reconstruction of a complete three-dimensional image of internal structures by recording of the differences in the effects on the passage of waves of energy reacting with those structures. Contrary to X-rays, produced in a conventional X-ray tube, the intense synchrotron light beams are sharply focused like a laser beam. We report encouraging results from the use of SRXTM for purely taxonomic purposes in brachiopods: an attempt to find a non-destructive and more efficient alternative to serial sectioning and several other methods of dissection together with the non-destructive method of X-ray computerised micro-tomography. Two brachiopod samples were investigated using SRXTM. In ?Rhynchonella? flustracea it was possible to visualise the 3D shape of the crura and dental plates. In Terebratulina imbricata it was possible to reveal the form of the brachidium. It is encouraging that we have obtained such promising results using SRXTM with our very first two fortuitous samples, which had respectively fine-grained limestone and marl as infilling sediment, in contrast to the discouraging results communicated to us by some colleagues who have tested specimens with such infillings using X-ray micro-tomography. In future the holotypes, rare museum specimens or delicate Recent material may be preferentially subjected to this mode of analysis.

Multi-elemental analysis of produced water by synchrotron radiation total reflection X-ray fluorescence

Talanta ◽  
2008 ◽  
Vol 74 (5) ◽  
pp. 1231-1235 ◽  
Author(s):  
P.M. Pimentel ◽  
M.J. Anjos ◽  
D.M.A. Melo ◽  
M.A.F. Melo ◽  
L.M. Gonçalves Jr. ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Elemental Analysis ◽  
Produced Water ◽  
Total Reflection ◽  
X Ray

scholarly journals Multielement analysis of plant extracts with potential use in the treatment of peptic ulcers by synchrotron radiation total reflection X-ray fluorescence

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5375
Author(s):  
Leticia Diniz Vieira ◽  
Káthia Takeda da Silva ◽  
Rodrigo Sanchez Giarola ◽  
Guilherme Franco Inocente ◽  
Hélio Kushima ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Intermediate Stage ◽  
Total Reflection ◽  
New Drugs ◽  
Peptic Ulcers ◽  
X Ray ◽  
Analytical Technique ◽  
Methanolic Extracts ◽  
Synchrotron Light ◽  
Almost All

Some plants popularly employed for the treatment of peptic ulcers have proved to be attractive sources of new drugs. Despite extensive research, the pharmacological and toxicological potentials of these plants are not fully understood. In this context, the aim of this work was to analyze the multielemental composition of the methanolic extracts of three of those plants, Alchornea glandulosa (AG), Davilla elliptica (DE) and Davilla nitida (DN), with the intention of contributing to the understanding of the mechanisms of action of these extracts. For this purpose, we used the analytical technique of total reflection X-ray fluorescence (TXRF) by synchrotron radiation at the Brazilian Synchrotron Light Source (LNLS/CNPEM). It was possible to determine the concentrations of the elements: P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn, Rb and Br in all of the samples. Selenium (Se) was detected only in the DN extract. An inverse relationship between the concentrations of elements with proven effectiveness and the gastroprotective activity of extracts considering induction protocols with ethanol and non-steroidal anti-inflammatory drugs (NSAIDs) was obtained. This data suggests that the function of the extract is not only associated with providing the elements for restoring the gastric mucosa but that it also promotes the displacement of these elements from other parts of the mucosa to the damaged area. Correlations between the concentrations of the elements were also obtained. In the DE extract, which is the most effective extract for both induction protocols, the obtained correlations were above 70% among almost all of the elements, and no anticorrelations were found. For the other two extracts, in the less effective extract (AG) anticorrelations above 70% were predominantly found. Meanwhile, in the DN extract, a few high anticorrelations were found, which may explain its intermediate stage of effectiveness.

A high-resolution Weissenberg camera for X-ray synchrotron radiation

1990 ◽  
Vol 23 (5) ◽  
pp. 351-354
Author(s):  
D. Hohlwein ◽  
J. D. Axe
Keyword(s):  
Phase Transformation ◽  
High Resolution ◽  
Synchrotron Radiation ◽  
Reciprocal Space ◽  
Experimental Results ◽  
Germanium Crystal ◽  
Synchrotron Source ◽  
X Ray ◽  
High Resolution Mapping ◽  
Resolution Mapping

A photographic Weissenberg camera has been constructed which can be mounted on the 2θ arm of a four-circle diffractometer. At a distance of 0.5 m from the sample the 2θ resolution for a 100 μm crystal is 0.2 mrad (0.01°), allowing a high-resolution mapping of reciprocal space at a synchrotron source in an efficient way. As sample experimental results, a study is presented of the streak system around the 111 reflection of a perfect germanium crystal and the detection of a minute phase transformation in a single-powder grain of a high-Tc superconductor.

Synchrotron radiation total reflection X-ray fluorescence (SR-TXRF) for evaluation of food contamination

2006 ◽  
Vol 270 (1) ◽  
pp. 147-153 ◽  
Author(s):  
A. E. S. Vives ◽  
S. Moreira ◽  
S. M. B. Brienza ◽  
O. L. A. Zucchi ◽  
V. F. Nascimento Filho
Keyword(s):  
Synchrotron Radiation ◽  
Food Contamination ◽  
Total Reflection ◽  
X Ray
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