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Kinetics of Radioactive decay

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1. surface water contains enough tritium to show 5.5 decays events per minute per 100. g of water. Tritium has a half-life of 12.3 years. You are asked to check a vintage wine that is claimed to have been produced in 1946. How many decay events per minute should you expect to observe in 100.g of that wine?

I just need someone to point me in the right direction with this. I calculated k, but I'm having trouble figuring out how to get the number of decay events/min. Thanks.
 

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Do I just do ln(N/5.5 decay events/min x g) = -(.693/12.3)(61 years) and solve for N?
 
malawi_glenn
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Have you tried? What result are you expecting?
 

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