[Milsurplus] Radioactive OA2 tubes?

[Niel Wiegand]

While scanning through the T-368 manual at 
http://128.205.126.49/images/PDF-Files/T-368-11-809-10.pdf  I came 
across the following warning on page 23:
> Tube types OA2 used in the transmitter contain radioactive material. 
> These tubes are potentially hazardous when
> broken; see qualified medical personnel and the Safety Director if you 
> are exposed to, or cut by, broken tubes.
> Use extreme care in replacing these tubes and follow safety procedures 
> in their storage and disposal (par. 28.1).
> Never place a radioactive tube in your pocket.
> Use extreme care not to break radioactive tubes while handling them.

I had not realized OA2s were radioactive.
- Is this true of all OA2 regulator tubes?
- Did the T-368 use special OA2s?
- What's the advantage of the radioactive OA2s used in the T-368?
- How are T-368/radioactive OA2s marked?

73,
Niel - W0VLZ