Your probably right Randy! But your noting 2 decades and still marginally visible is reassuring. I've recently started wear a watch (Uzi) with Tritium sapphires @ all face positions except sweep second hand. Nice to know I can count on at least 7-10 years out of a $75.00 watch.

Mr. B,
Yup, knew the primary use of it. The Israeli's were the first to use it for this specific application I believe? No doubt discovered during their non-existent weapons program while working on the thermonuclear device's that they also don't have?