Browsing by Author "Blake, RG"

Now showing 1 - 7 of 7
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    Calibration of a JSEM-200 electron microscope
    (Australian Atomic Energy Commission, 1975-10) Blake, RG; Jostsons, A; Kelly, PM
    The results of a detailed calibration of a JSEM-200 scanning transmission electron microscope are reported. Two types of measurements have been made: (a) calibration of the various parameters associated with scanning transmission (STEM) imaging, and (b) calibration of the usual parameters required for analytical diffraction contrast experiments in the conventional transmission mode (CTEM). The report also contains a detailed discussion of the various STEM imaging modes and the microscope settings necessary to obtain the required image.
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    Calibration of a JSEM-200 electron microscope with a magnetic specimen pole-piece
    (Australian Atomic Energy Commission, 1980-02) Blake, RG; Jostsons, A
    This report contains the results of a detailed calibration of the JSEM-200 scanning transmission electron microscope operated with a magnetic specimen pole-piece as supplied by JEOL (Japan Electron Optics Laboratory) Ltd. The microscopy, in this configuration, permits convenient examination of ferromagnetic specimens in the side-entry goniometer specimen stage with a point-to-point resolution better than 2.0 nm.
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    Characterisation of neutron irradiation damage in zirconium alloys - a 'round robin' experiment
    (Australian Atomic Energy Commission, 1977-01) Blake, RG; Jostsons, A
    The nature of the damage structure in the neutron-irradiated zirconium specimens supplied as part of an international 'Round Robin1 experiment has been studied using transmission electron microscopy. The damage structure consists entirely of a/3 <1120> dislocation loops and no evidence has been found for c_ component loops. Both vacancy and interstitial loops were found in specimens where inside/outside contrast analysis was possible. Quantitative measurements of loop size distributions and loop concentrations are reported. All specimens exhibited corduroy contrast to varying degrees.
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    Colour film techniques for hot-cell radiography
    (Australian Atomic Energy Commission, 1971-08) Arthur, J; Blake, RG; Kelly, PM
    The report describes the processing and exposure conditions required to produce good colour radiographs of dummy fuel pins. Using a travelling microscope, cladding tube diameters, fuel pellet diameters and tube/pellet gaps were measured on colour radiographs to an accuracy of better than + 0.002 inches. The minimum detectable tube/pellet gap was 0.003 inches. In all cases the colour radiographs proved to be as good as or better than black and white radiographs of the same object. The se a microdensitometer to measure colour radiographs, it was necessary to print the radiographs on black and white film. A suitable black and white emulsion for this process was established and the results obtained compare favourably with those taken from black and white radiographs. Colour film is more tolerant to gamma radiation than an equivalent black and white x-ray film.
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    An inclined specimen cartridge for use in the JEM-7A goniometer stage
    (Australian Atomic Energy Commission, 1971-12) Blake, RG; Kelly, PM; Warren, RB
    The inclined specimen cartridge is designed to hold 3 mm discs at a predetermined angle to the beam. The cartridge fits a standard double tilt goniometer stage, no modifications of the microscope are required and the full tilt range of the goniometer stage is still available. Loading and operational instructions are outlined with the aid of a sectional diagram.
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    Radiation damage in zirconium
    (International Institute of Welding, 1976-08-23) Jostsons, A; Blake, RG; Kelly, PM
    A transmission electron microscopy study if the defect structure in neutron irradiated zirconium has shown the existence of mixed vacancy/interstitial dislocation loop populations with a/3 <1120> Burgers vectors. The absence of c component dislocation loops indicates clearly that the Buckley model for irradiation growth in neutron irradiated zirconium is invalid.
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    Transmission electron microscope procedures for characterising dislocation loops in neutron-irradiated zirconium and its alloys
    (Australian Atomic Energy Commission, 1976-04) Blake, RG; Jostsons, A; Kelly, PM
    Complete characterisation of the dislocation loops in irradiated zirconium and its alloys present particular problems; these include unfavourable texture, the presence of thin foil artefacts; the non-edge character of the loops and their elliptical shape. The procedures adopted to deal with these problems are described and a number of precautionary measures are listed. After considering the possible confusion between thin foil artefacts and small defect clusters, the report outlines the characterisation procedure in the order; Burgers vector identification; loop geometry; loop nature; and quantitative measurements. A detailed analysis of the possible errors associated with loop ellipticity is given in Appendix A.