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I suspect they may have heard reference to the "regulator tube" used in some Transoceanics (type 50A1) that's used as voltage dropper/current regulator for the filament string, and conflated it with gas regulator types which are used for B+ shunt regulation in precision equipment, and do contain a trace of radioactive stuff. It promotes reliable ionization of the gas.
The 50A1, by contrast, is a thermally-variable resistor and contains nothing radioactive.
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