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Strontium-90 decays through the emission of beta particles. It has a half-life of 29 years. How long does it take for 80% of a sample of strontium-90 to decay?
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Answered by DrBob222
k = 0.693/t<sub>1/2</sub>
ln(No/N) = kt

Use No = 100
N = 20
k from above
solve for t in years.
Answered by bob
27
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