Re: Radioactive material on CV990 ?

Date:         03 Nov 97 02:18:53 
From:         mweber@t140.aone.net.au (James Matthew Weber)
Organization: Customer of Access One Pty Ltd, Melbourne, Australia
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>- Are there other examples where radioactive materials are employed in
>civil a/c ?

It dawns on me there is indeed, and it is on most aircraft. The Exit
signs that glow  in the dark, use Tritium, the radioactive isotope of
Hydrogren to light them. It is essentially a luminous dial, but a lot
less hazardous than using radium.

Tritium is a low energy Beta emitter, with a fairly short half life
(about 5 years I think). The Beta energy is sufficiently low that the
radiation is probably undetectable outside the sign.