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  RID-1 smoke detector with plutonium source Smoke detector made in USSR, containing plutonium
RID-1 (-1), Smoke detector made in USSR. Has two Plutonium sources with ca 0.5 mg of 239Pu each.

  RID-6M smoke detector with plutonium source Smoke detector made in Russia, containing plutonium
RID-6M (-6), Newer model of smoke detector with Plutonium sourse. 239Pu amount several times less than in RID-1. Seems still producing in Russia.