Browsing by Author "Calf, GE"

Now showing 1 - 9 of 9
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    AAEC tritium list no. 2, 1975-1976
    (Australian Atomic Energy Commission, 1977-08) Calf, GE; Smith, LW; Stokes, RC
    Details are given of the concentration of the environmental isotope tritium in monthly samples of precipitation taken at l6 stations, situated throughout Australia, during the period 1975-1976.
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    AAEC tritium list no. 3, 1977-1978
    (Australian Atomic Energy Commission, 1979-06) Calf, GE; Stokes, RC
    Details are given of the concentration of the environmental isotope tritium in monthly precipitation samples taken at 16 stations, situated throughout Australia, during the period 1977-1978.
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    AAEC tritium list no. 4, 1979-1980
    (Australian Atomic Energy Commission, 1981-07) Calf, GE; Stokes, RC
    Details are given of the concentration of the environmental isotope tritium in monthly precipitation samples taken at 16 stations situated throughout Australia in 1979-1980.
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    AAEC tritium list no. 5, 1981-1982
    (Australian Atomic Energy Commission, 1983-06) Calf, GE; Stokes, RC
    Details are given of the concentration of the environmental isotope tritium in monthly precipitation samples taken at 16 stations situated throughout Australia during the period 1981-1982. Tritium levels in Australia have now been estimated for 13 years. The results show a significant decrease in tritium concentration in rainfall at all monitoring stations.
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    AAEC tritium list no. 6, 1983-1984
    (Australian Atomic Energy Commission, 1985-07) Calf, GE; Stokes, RC
    Details are given of the concentration of the environmental radioisotope tritium in montly precipitation samples taken during the period 1983-1984 at eleven stations throughout Australia: Adelaide Alice Springs Brisbane Campbelltown Cape Grim Darwin Longreach Mackay Melbourne Narrabri West and Perth. Results show that the tritium concentration in rainfall is still decreasing at most monitoring stations.
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    AAEC tritium list no.1, 1970-1974
    (Australian Atomic Energy Commission, 1976-01) Calf, GE; Seatonberry, BW; Smith, LW; Stokes, RC
    Details are given of the concentration of the environmental isotope tritium in monthly samples of precipitation taken at 16 stations, situated throughout Australia, during the period 1970-1974.
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    ANSTO tritium list no. 1, 1985-1986
    (Australian Nuclear Science and Technology Organisation, 1987-08) Calf, GE; Stokes, RC
    Details are given of the concentration of the environmental radioisotope tritium in monthly precipitation samples taken during the period 1985-1986 at eleven stations throughout Australia. Tritium levels in Australian rainfall have been estimated for seventeen years and published first as reports of the Australian Atomic Energy Commission and now of the Australian Nuclear Science and Technology Organisation.
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    The measurement of natural levels of tritium in water.
    (Australian Atomic Energy Commission, 1976-07) Calf, GE; Seatonberry, BW; Smith, LW
    This paper describes equipment and techniques used in the tritium laboratory at the Australian Atomic Energy Commission Research Establishment for the determination of low level activities of tritium in water samples. Samples are enriched by electrolysis in sixteen glass cells connected in series. An enrichment of about 25 times and an enrichment factor of about 0.85 are obtained. A calibrated ampere-hour meter in series with a precision shunt measures the weight of water electrolysed and a preset counter is used to shut off the current when 20 g of electrolyte remains in each cell. After distillation the enriched samples are counted in Teflon vials using emulsion liquid scintillation techniques. The accuracy of measurements is discussed and applied to routine measurements. The overall standard deviation for samples having an activity greater than 5 'tritium units' is less than 10%.
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    Tritium activity in Australian rainwater 1962-1986
    (Australian Nuclear Science and Technology Organisation, 1988-07) Calf, GE
    Atmospheric tritirecipitated in rainfall has been measured since 1962 in samples from a network of Australian monitoring stations. Atmospheric thermonuclear bomb tests have injected into the atmosphere about 350 kg of tritium mostly into the northern hemisphere's troposphere and stratosphere causing atmospheric concentrations of tritium to reach peak values of 50 to 100 tritium units (TU) in the southern hemisphere. Tritium from underground testing has not contributed significantly to the amounts in the atmosphere or in surface waters. In Australia peak concentrations of precipitated tritium were observed in 1962, 1964 and 1969. The tritium activity in rainwater for all Australian stations decreased after 1969. Radioactive decay of bomb tritium will decrease the tritium budget to the natural level by the early 1990s in Australian precipitation.