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The half-life of strontium-90 is 28 years. How long will it take a 76 mg sample to decay to a mass of 19 mg?
Wiki User
∙ 14y ago
After 28 years your sample halves, ie becomes 38 mg. In another 28 years it will have halved again to 19 mg, so your answer is 56 years
It may not seem important, but you should remember that your sample is not evaporating. The actual 76 mg sample will still have almost all of its mass after 56 years. But by that time only 19 mg of it will be strontium-90. The rest of the sample will still be there, but it will have become Zirconium-90 which is stable.
Wiki User
∙ 14y ago
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56 years
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