> When I worked at the DSIR in NZ they were doing a mortar ranging 
> calculator
> as a project, and to illuminate the display has some little glass 
> vials
> filled with a tritium based radio active source IIRC, that caused a
> fluorescent coating on the inside of the tube to glow pale green. 
> Apparently
> these are only available to the military because of the radio active 
> content

It's also, fwiw, the H in H Bomb.


        Russell


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