Strontium-90 is a byproduct in nuclear reactors fuelled by the radioisotope uranium-235. The half-life of strontium-90 is 28.8 y. What percentage of a strontium-90 sample remains after 75.0 y.?

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Quizplus · Accepted Answer

The percentage of a radioactive sample remaining after a certain time can be calculated using the formula: remaining percentage = (1/2)^(time/half-life) * 100. For strontium-90, after 75.0 years, the calculation is (1/2)^(75.0/28.8) * 100, which equals approximately 16.4%.

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