Abstract
A simple new technique utilizing radio-isotopes for the measurement of groundwater flow direction in boreholes sites in granular pervious material is described. The conventional technique of injection and subsequent measurement of the adsorbed activity peak on the borehole screening by a collimated counting detector is replaced by a single unit incorporating a time-delayed injection mechanism and a cylindrical gauze. A fraction of the radio-isotope injected is adsorbed on the gauze which is then removed from the borehole to be analysed in the laboratory for isotope distribution. Evolution of this technique consisted of comparative field tests with a collimated geiger counter. Results, within the inherent accuracy of both techniques, were identical. The method described allows measurement to greater depth, is less time consuming and dispenses with the necessity of transporting electronic equipment into the field.
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