In article ,
J. P. Gilliver (John) wrote:

(Remember, of course, that all elements are radioactive, and have a half
life. It's just that most have such long half lives that we don't
normally _consider_ them radioactive.)

Really? Do you have a reference for that?

That is, for there being no completely stable isotopes?

-- Richard
--
Please remember to mention me / in tapes you leave behind.