- Published: Tuesday, 22 December 2015 09:52
The colour imaging bay is an in-house built system designed as a flexible work bench for spectroscopic X-ray imaging and tomography. The spectroscopic capability enables chemical sensitivity combined with 2D or 3D imaging. The bay is principally designed for X-ray fluorescence (XRF) imaging using a pinhole camera arrangement. X-rays are absorbed and re-emitted from atoms within the sample. These photons have characteristic energies specific to each atomic element. They are detected using a pixelated energy sensitive detector using a pinhole optic which is positioned perpendicular to the beam direction. Spatial resolution depends upon the size of the pinhole optic and geometric magnification but is typically in the range of 20 - 200 microns. Scan times can be very long, normally 5 - 10 mins per projection with a full 3D scan taking up to 24 hrs.
Additionally within the colour bay we are developing X-ray powder diffraction (XRD) imaging using the same technology by positioning the pinhole camera at low angles (~5 degrees) to the incident beam direction. By doing this each pixel contains an energy dispersed powder diffraction pattern, characteristic of the crystalline structure of the sample.
This capability is a working development and is not yet ready for wide scale adoption but if you are interested in conducting any spectroscopic experiments, please contact Chris Egan for more information.