Hey Jeff,
I've several old valves (Tubes) that are marked as containing "Radio
Active Material" with a "Do not Break Glass" and a yellow sticker on
them. CV number marking. Any ideas ?
They are stored in a box somewhere. If I can find them I'll come back
with the CV numbers.

--
Best Regards:
Baron.

Probably cold-cathode rectifier tubes, equivalent to types like 0A2, 0D3,
etc. I have at least one American-made 0A2 that has a radioactive symbol on
the box, and the tube itself says "Contains less than 0.03 microcuries of
Krypton".