Abstract
RADIOACTIVE tracer studies in progress at this Laboratory employing insecticides labelled with bromine-82 have involved activity measurements on liquid and solid samples, and on gaseous samples in certain cases. Liquid samples (usually as soluble bromide) were assayed in a Geiger–Müller counter of the type described by Veall1, whereas solids (usually as silver bromide) were assayed under a thin mica end-window counter of conventional design. For bromine-82 activities (Eβ-max. = 0·46 MeV., Eγ = 0·55, 0·79 and 1·35 MeV.) the use of liquid samples proved the more convenient ; but that of prepared precipitates was some fifteen times more efficient. The higher efficiency was a decisive factor with samples of low specific activity.
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References
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WINTERINGHAM, F. Preparation of Silver Bromide Precipitates for Radioactivity Measurements. Nature 164, 183–184 (1949). https://doi.org/10.1038/164183b0
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DOI: https://doi.org/10.1038/164183b0
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