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32 Si (β - . 0,1 MeV, half life about 280 years) has been used, as for as we are aware, for the first time in bio­ logical and biochemical experiments . 32Si was incorporated by the pathway of the silicon metabolism into shells of two diatom species (Cyclotella cryptica and Nitzschia spec.) and reisolated by dissolving the shells. Contaminating isotopes  3 H and  60 Co with 10000 times more activity were largely removed by this procedure.

The Separation of 32 Silicon from Contaminating 3 H and 60 Co by Incorporation into Diatoms