Biography:

In the past G.W Fraser has collaborated on articles with C.M Castelli and Alan Owens. One of their most recent publications is Letter to the editorA novel high energy X-ray detector concept using CCDs. Which was published in journal Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.

More information about G.W Fraser research including statistics on their citations can be found on their Copernicus Academic profile page.

G.W Fraser's Articles: (3)

Letter to the editorA novel high energy X-ray detector concept using CCDs

AbstractThe X-ray detection efficiency of charge coupled devices (CCDs) is dependent on the thickness of the active depletion layer in the silicon, typically less than 40 μm and limited by the purity of available epitaxial substrates. For X-ray imaging, therefore, the CCD detection efficiency drops sharply above 8 keV. In this Letter, we show that, using a novel illumination geometry, CCDs can detect high energy (up to 100 keV) X-rays with reasonable efficiency and good energy resolution. A novel 2-D imaging hard X-ray detector based on this geometry is discussed.

Imaging in astrophysics (and elsewhere)

AbstractA brief account is given of the application of imaging detector technologies developed for cosmic X-ray astronomy in a number of other fields, including beta autoradiography, thermal neutron imaging and X-ray fluorescence spectroscopy, both in a planetary and a laboratory context.

Near K-edge linear attenuation coefficients for Si, SiO2 and Si3N4

AbstractWe present tabulated near K-edge linear attenuation coefficients for a range of materials commonly used in MOS construction; namely, crystalline silicon (Si-c), amorphous silicon (Si-a), amorphous silicon dioxide (SiO2-a) and amorphous silicon nitride (Si3N4-a). The coefficients were derived from total photocurrent measurements of X-ray absorption fine structure (XAFS) obtained at the Daresbury Synchrotron Radiation Source and show considerable near-edge structure when compared to curves generated from standard atomic data tables.

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