Abstract

Abstract Cobalt-57 can be measured in a liquid scintillation counting system. We describe the calibration of such a system for this gamma emitter. The counting procedure has been used in the radioassay of vitamin B12. Results of assays for which counting of bound radioisotope was done in a gamma scintillation spectrometer and in a liquid scintillation counter show that either counting system can be used for the measurement of [57Co].

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