Energy dispersive detector for white beam synchrotron x-ray fluorescence imaging
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2016-01-01 |
| Journal | AIP conference proceedings |
| Authors | Matthew D. Wilson, Thomas Connolley, Igor P. Dolbnya, Patrick S. Grant, Enzo Liotti |
| Institutions | University of Oxford, Rutherford Appleton Laboratory |
| Citations | 4 |
Abstract
Section titled āAbstractāA novel, āsingle-shotā fluorescence imaging technique has been demonstrated on the B16 beamline at the Diamond Light Source synchrotron using the HEXITEC energy dispersive imaging detector. A custom made furnace with 200Ī¼m thick metal alloy samples was positioned in a white X-ray beam with a hole made in the furnace walls to allow the transmitted beam to be imaged with a conventional X-ray imaging camera consisting of a 500 Ī¼m thick single crystal LYSO scintillator, mirror and lens coupled to an AVT Manta G125B CCD sensor. The samples were positioned 45Ā° to the incident beam to enable simultaneous transmission and fluorescence imaging. The HEXITEC detector was positioned at 90Ā° to the sample with a 50 Ī¼m pinhole 13cm from the sample and the detector positioned 2.3m from pinhole. The geometric magnification provided a field of view of 1.1Ć1.1mm2 with one of the 80Ć80 pixels imaging an area equivalent to 13Ī¼m2. Al-Cu alloys doped with Zr, Ag and Mo were imaged in transmission and fluorescence mode. The fluorescence images showed that the dopant metals could be simultaneously imaged with sufficient counts on all 80x80 pixels within 60s, with the X-ray flux limiting the fluorescence imaging rate. This technique demonstrated that it is possible to simultaneously image and identify multiple elements on a spatial resolution scale ~10Ī¼m or higher without the time consuming need to scan monochromatic energies or raster scan a focused beam of X-rays. Moving to high flux beamlines and using an array of detectors could improve the imaging speed of the technique with element specific imaging estimated to be on a 1s timescale.