Abstract
A simple surface labelling procedure of suspended river particles and cellulose fibres has been developed. The procedure consists of a simple getting into contact of concentrated suspension of material in water with 140La(NO 3) 3 solution. The pH value of both solutions should be about 6–8. By suitable choice of quantity of particles to be labelled and quantity of lanthanum, an irreversible fixing of more then 90 per cent activity can be reached eliminating the need for washing. The sand labelling attempt gave poor results in comparison with those obtained with the two said materials.
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