Strontium-90 is a byproduct in nuclear reactors fuelled by the radioisotope uranium-235.The $\text { half-life }$ of $\text { strontium-90 }$ is 28.8 y.What percentage of a strontium-90 sample remains after 85.0 y.?

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The percentage of a radioactive sample remaining after a certain time can be calculated using the formula: $ \text{Remaining percentage} = (0.5)^{\frac{\text{time elapsed}}{\text{half-life}}} \times 100\% $. For strontium-90, after 85 years, this calculation gives approximately 12.9%.

Strontium-90 Is a Byproduct in Nuclear Reactors Fuelled by the Radioisotope