Posted by **Tritium** on Monday, November 7, 2011 at 10:40pm.

Half-life of tritium is 12.32 years.

Write decay equation as

N(t) = N(subzero)e^(-rt)

where t is the time in days, N(subzero) is the starting amt of tritium and N(t) is amt of tritium at time t.

don't know how to find -r.

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