Abstract
We describe some cases of unusual internal radioactive background in BGO crystals. Routinely produced at the Nikolaev Institute of Inorganic Chemistry during nearly a quarter of a century, BGO crystals have low radioactive background caused by 207Bi contamination. However, some BGO crystals incidentally have higher internal radioactive background with activity up to 10 Bq/kg. This background is pure alpha radioactivity. It is caused by 210Po contamination and has technogenic origin.
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