Skip Ribbon Commands
Skip to main content

micro_confocal_XRF

Micro & Confocal XRF​


The use of x-ray optic devices allows focusing x-ray beams to a volume with different size, depending on the used optics. Poly-capillary lenses are one of the more used devices due to their relatively affordable costs. By translating the sample in two directions, 2-dimensional maps depicting the spatial distribution of the elements can be made. If an additional focusing element is placed in front of the detector, a confocal effective volume is probed, thus allowing to render 3D distribution of elements.

The instrument assembled at NSIL uses two detectors, arranged according to the schematics below:

Micro_SCH.pngIts main features can be summarized as follows:


x-ray tube

 

Anode material

Mo

Max. HV (kV)

50

Max current (uA)

50

Focusing optic

Poly-capillary lens

Spot size dimensions

25 x 37 microns

 

Micro-XRF

Confocal-XRF

Inspected volume (microns, x,y,depth)

(25, 37, sample matrix dependent)

For light matrices:

(25, 15, 15)

Detector

SDD

SDD

Effective area (mm2):

10

10

Energy resolution (eV):

135

135

Translation of the sample

Motorized sample stage, xyz translation and Ө rotation, software controlled,

Video camera:

Yes

Calibrations for quantitative analysis:

None

Spectra export:

Yes

Image Post-rendering

Avizo 7.0


Publications of interest:

·         Micro-beam X-ray fluorescence and absorption imaging techniques at the IAEA Laboratories, Nucl. Instrum. Methods Phys. Res., Sect. B 231 (2005) 176 https://doi.org/10.1016/j.nimb.2005.01.053 

·         Experimental evaluation of X-ray optics applied for microanalysis, X-Ray Spectrom. 2008; 37: 635, https://doi.org/10.1002/xrs.1113

·         The mystery of mercury-layers on ancient coins – a multianalytical study on the Sasanian coins under the reign of Khusro II", Microchemical Journal 125 (2016) 159-169, https://doi.org/10.1016/j.microc.2015.10.024

·         Experimental assessment of effectively probed volume in confocal XRF spectrometry using micro-particles, Volume48, Issue5, 2019, Pages 553-560, https://doi.org/10.1002/xrs.3045
























Micro-Conf.jpg