Abstract
Vit. B12 was activated by bombardment with thermal neutrons in the atomic pile. In each of 2 expts. a small proportion of the induced activity remained associated with the vit. B12 after thorough purification by solvent extraction, recrystallization and chromatography. The 2d expt. provided evidence that the P as well as the Co in the vit. B12 had become radioactive.

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