SOLUTION: Strontium 90 (Sr-90), a radioactive isotope of strontium, is present in the fallout resulting from nuclear explosions. It is especially hazardous to animal life, including humans,

Question 792088: Strontium 90 (Sr-90), a radioactive isotope of strontium, is present in the fallout resulting from nuclear explosions. It is especially hazardous to animal life, including humans, because, upon ingestion of contaminated food, it is absorbed into the bone structure. Its half-life is 27 years. If the amount of Sr-90 in a certain area is found to be two times the "safe" level, find how much time must elapse before the safe level is reached.
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Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
If strontium's half-life is 27 years, the original amount ( twice the safe level) will be halved to the safe level in 27 years.
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