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Posted by **Cratch** on Thursday, August 26, 2010 at 2:26am.

- Calculus -
**drwls**, Thursday, August 26, 2010 at 7:26am1996 is 31 years after 1965. Since the half life is 32 years, the amount of Sr-90 is nearly, but not quite, reduced by half.

Fot the exact number,

N/No = 2^(-31/32) = 0.511

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