An apparatus is described, consisting of six large γ-ray counters connected in parallel to a suitable counting ratemeter. It will detect about 0·01 μC and will accurately measure quantities of the order of 1 μC of I131 or Na24 in samples of urine up to 2 litres and of faeces up to 500 gms. without it being necessary to open the containers. P32 can be detected in microcurie amounts by bremsstrahlung, thus simplifying the monitoring of excreta from P32 therapy patients. The use of this equipment for measurements in live laboratory animals is suggested. In practice, a considerable saving of time and effort is effected by the use of this method.
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Veall et al. (1952) studied this question.
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