>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 25 September 2006 16:06
>To: Microcontroller discussion list - Public.
>Subject: [OT] radio activity, was Re: Pseudo Random Number Generation
>
>
>
>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 ...


I have a tritium based keyring at home!  You can buy these freely from e.g. http://www.theglowcompany.co.uk/acatalog/GLOW_RINGS.html

The guy I work next to is keen on diving, and bought a couple of these keyrings to fit the small glass vials they contain into his wrist mounted dive computer display.

Would be interesting to know how much radiation these things give off, but it must be pretty low.  I hope.

Regards

Mike

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