AP Environmental Science (URGENT)
posted by Heather .
Strontium90 is a radioactive waste product from nuclear reactors. It has a halflife of 29 years. How many years will it take for a quantity of strontium90 to decay to 1/16 (onesixteenth) of its original mass?

since 1/16 = (1/2)^4
It will take 4 halflives to decay that far.
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