In a number of threads here and elsewhere it has been discussed that the Repro-Clarons are radioactive with some of their elements (the outer ones) having been made with Thorium doped glass. One post suggests that late model versions are not radioactive because Schneider stopped using this glass in the early 70's. Does anyone know if this is true and if so, what serial numbers correspond to when they stopped?
Thanks,
Dave B.
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