Enhancing Micro XRF Analysis with Polycapillary Optics

X-ray fluorescence (XRF) is a commonly used technique for elemental analysis. Compared to other technologies, XRF is non-destructive, easy to use, and requires minimal sample preparation. Micro-XRF applies the same principles as XRF but on a much smaller (micro) scale.

Challenge

To perform micro-XRF, a micron-sized beam of X-rays is required to hit the sample. This small beam can be achieved using a conventional pinhole aperture or X-ray optics. One challenge faced with using a conventional pinhole aperture is that it will block a large portion of the X-rays emitted from the source thereby reducing the number of X-rays hitting the sample, resulting in much lower fluorescence. Another challenge presented is that the output beam from the pinhole will be divergent, resulting in a larger excitation area on the sample. Both challenges impact the detection sensitivity and spatial resolution of micro-XRF analysis.

Solution

It has been proven that the use of polycapillary focusing optics greatly enhances micro-XRF analysis. Polycapillary optics offer many benefits; a large collection solid angle, high flux density, and a focused micron sized beam. Polycapillary optics transmit a polychromatic beam that can achieve a focused spot size as small as 5μm, FWHM at Rh Kα energy (20.2keV) with intensities greater than 107 photons/second. These performance attributes provide a great impact to micro-XRF across many different applications. Figure 1 below is an example of a mapping application.

Product Highlight: fleX-Beam

Flexible Design, Unyielding Performance
fleX- Beam^TM is a unique, compact X-ray generator that combines a low powered X-ray source and a precisely-aligned polycapillary optic to deliver a bright X-ray beam for advanced material analysis. fleX-Beam is available in several standard focused or collimated beam configurations and can also be customized for specific applications. This is the ideal solution for any OEM or lab-based system.