Browsing by Author "Watt, JS"

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    Effect of variations of entrained air in mineral slurries on the precision of on- stream analysis using radioisotope x-ray techniques.
    (Australian Atomic Energy Commission, 1972-11) Watt, JS
    Variations in entrained air in mineral slurries cause errors in on-stream X-ray analysis for element concentration in the slurry solids. Complete elimination of entrained air may not always be practicable, particularly for radioisotope X-ray techniques where probes are immersed directly into existing plant slurry vessels through which the whole process stream flows. Calculations of the effect of entrained air on precision of analysis show that X-ray preferential absorption techniques are usually much more affected than X-ray fluorescence techniques. Calculations agree reasonably well with results of plant trials of on-stream analysis. Errors in analysis using radioisotope immersion probes should in most cases be within limits acceptable for plant control.
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    Measurement of concentration of tungsten suspensions and density of liquid sodium by gamma ray absorption
    (Melbourne University Press on behalf of The Australian Atomic Energy Commission, 1958-06-02) Watt, JS; Lawther, JS
    Gamma ray absorption techniques have been applied to measure the density of various media, and the theory of selecting the appropriate energy gamma ray to give optimum sensitivity of density determination for a homogeneous system is outlined. A gauge to determine the concentration of tungsten powder suspended in water in a concentration range of O to 8 gm. tungsten/c.c. suspension, has been developed. In this apparatus the mean tungsten concentration, 0.08 gm./c.c., can be measured to an accuracy of approximately +-0.0015gm./c.c. In the case of liquid sodium contained in o stainless steel vessel, preliminary experiments indicate that the density may be measured to an accuracy of +-0.01gm./ c.c. and that 0.01gm./c.c. transient changes in density occurring in a few seconds can be resolved.
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    A power station cooling pond performance test with radioactive tracer iodine 131 second experiment at Maitland, N.S.W.
    (Australian Atomic Energy Commission, 1960-03) Ellis, WR; Fookes, RA; Gardner, ME; Hope, JA; Lamb, N; van Louwersen, P; Watt, JS
    A second tracer experiment to study the flow of power station cooling water in a cooling pond is described. Since the first experiment in March, 1958, the intake point had been deepened and extended into the pond in an attempt to avoid channelling. The technique used in this test was similar to that used in the first but severe weather conditions were experienced. The results showed that even a moderate wind had more effect on the flow pattern than any other factor. Some aspects of this effect were studied quantitatively. The different weather conditions experienced in the two test did not permit conclusive observations on the effects of the modified intake.
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    Production of high specific activity cobalt-60 in HIFAR
    (Australian Atomic Energy Commission, 1959-02) Watt, JS
    High specific activity cobalt 60 sources, as used in teletherapy work, may be produced in HIFAR. Approximate calculations indicate that a specific activity of 30 curies per gram per year can be made in the 2V and 6V experimental holes, and that a total activity of 21,000 curies per year in these holes corresponds to using 1% excess k.
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    The use of a radioactive tracer (iodine-131) in the investigation of a power station cooling pond at Maitland, N.S.W.
    (Australian Atomic Energy Commission, 1958-09) Ellis, WR; Fookes, RA; Gardner, ME; Gregory, JN; Kirkwood, JB; Lamb, GN; Watt, JS
    Radioactive iodine 131, as iodide in solution, was used to trace the flow of power station condenser water through a cooling plant. The station has rating of 20 MW and the circulating water is cooled in a pond of approximately 2 X 108 gallons capacity and 40 acres area. By labeling the warm water with 473 millicuries of iodine 131 in potassium iodide carrier, introduced at the power station outlet, and using underwater scintillation and Geiger counters, it was possible to follow quantitatively the horizontal and vertical spread of water over a period f eight days after which mixing was complete. The results gave valuable information on the pond performance under weather conditions prevailing during the test period and indicated some possibilities for improvement of performance. Further tests with iodine 131 are contemplated with modification of pond conditions