Abstract
Details are given of the initial findings of a method based on a radioactive labelling procedure to observe the movement of tritiated water in soil. Very small samples can be withdrawn allowing much closer spacing to give a greater accuracy than conventional methods but still permitting the assessment of variability. The technique makes use of a miniature sampler which is pushed through the inner membrane of a specimen holder, the outer membrane is first rolled back and then returned to its original position after sampling. The radioactivity of each sample was determined by the use of a liquid scintillation counter. The best method of determining the radioactivity of the diluted labelled water appears to be by the sampling before addition to the cement and aggregate. The method can be used on full-scale experiments in the field and it is claimed to be two orders of magnitude better than the conventional oven-drying method. There is little or no hazard as the level of radioactivity is low and the average energy of the tritium beta radiation is very weak. (TRRL)
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