Date: 03 Nov 97 02:18:53 From: firstname.lastname@example.org (James Matthew Weber) Organization: Customer of Access One Pty Ltd, Melbourne, Australia References: 1
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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.