Browsing by Author "Walker, DG"

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    Atomic diffusion in ceramic oxides
    (Australian Atomic Energy Commission, 1967-12) de Bruin, HJ; Bradhurst, DH; Walker, DG
    Diffusion mechanisms in ceramic oxides are considered and available data in the literature broadly reviewed. It is noted that a simple correlation for cation self-diffusion in oxides based on structural considerations is not likely to eventuate, although some correlation for oxygen diffusion should exist. Greater sensitivity is required to study diffusion in oxides than can be obtained by conventional tracer lapping. The less common methods that may be applicable are reviewed.
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    Full-energy-peak efficiencies of three gamma-ray detectors
    (Australian Atomic Energy Commission, 1967-01) Hanna, GL; Walker, DG; Beach, PM
    Two sodium iodide scintillators and a lithium-drifted germanium detector are used in the analysis by gamma-ray spectrometry of gaseous fission products obtained in sweep-capsule fission product release experiments. A description is given of the measurements of full-energy-peak efficiencies of the three detectors for the source geometries used in counting the fission product samples. Experimental efficiencies are compared with calculated efficiencies for one of the sodium iodide detectors. Measurements made of the resolutions obtained with each detector are also noted.