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ln (Nt/No) = -kt
Nt/No is the ratio of the activity at time t to the original activity.
We also know that t1/2 = 0.693 / k.
k = 0.693 / t1/2 = 0.693 / 5730 y = 0.000121 y^-1
So ln (0.80 / 6.4) = -(0.000121) t
-2.08 = -0.000121 t
t = 17,200 years
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