Abstract
SummaryRadioactivity in soils labelled with 14C was determined by suspending the finely ground soil in a thixotropic gel, dispersing it by ultrasonics and counting the dispersion in a liquid scintillation spectrometer. The relationship between the weight of sample and counting efficiency was found to be almost linear. Using 30 mg soil, the counting efficiency is 50 per cent and 14C may be determined with an average coefficient of variation of 1.5 per cent to within 5 per cent of the value determined by oxidative procedures.
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