Abstract
A neutron activation method is described for the estimation of barium or strontium in biological materials which is not disturbed by the presence of a large excess of calcium. The method is a comparative one in which a weighed amount of a pure barium or strontium salt receives the same neutron irradiation in a nuclear pile as a weighed aliquot from the unknown specimen. Following a chemical separation, the activity of the barium or strontium fraction from the unknown is compared with that from the appropriate standard. The error of the method is estimated to be about 5 per cent in specimens containing from 1 to 50 hg of either element.
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