Browsing by Autor "J A Lowdon"

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    Geological Survey of Canada Radiocarbon Dates X
    (Cambridge University Press, 1970) J A Lowdon; Roscoe Wilmeth; Weston Blake
    The laboratory routinely operates two proportional counters; one 2-L (Dyck and Fyles, 1962) and one 5-L (Dyck et al. , 1965). CO 2 is used as the counting gas. The 2-L counter is operated mainly at 2 atm. and the 5-L counter mainly at 1 atm. On occasion the 2-L counter is operated at 1 atm. and the 5-L counter at 4 atm. No changes have been made in the CO 2 preparation and purification techniques described in previous GSC dating lists (Lowdon et al. , 1969; Lowdon and Blake, 1970).