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Old 12-08-2008, 10:16   #9
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Originally Posted by California Jack View Post
Sure, it is not too much more than 10 years, why?
My point was that it lasts a long time and that the tritium can be replaced. A company like Ball is not going anywhere, anytime soon, so service on the watch would be possible.

FWIW, I thought the life was a bit longer, but oh well...

While Tritium has several different experimentally-determined values of its half-life, the NIST recommends 4500±8 days (approximately 12.32 years).<SUP class=reference id=cite_ref-0>[1]</SUP> It decays into helium-3 by the reaction
<DL><DD><TABLE border=0><TBODY><TR style="HEIGHT: 2em"><TD>
T </TD><TD>→ </TD><TD>
</TD><TD>+ </TD><TD>e<SUP>−</SUP> </TD><TD>+ </TD><TD>νe</TD></TR></TBODY></TABLE></DD></DL>and releases 18.6 keV of energy in the process.
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