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 85.0 y.?

Question

Quizplus · Accepted Answer

After 85 years, which is approximately 2.95 half-lives (85/28.8), the remaining percentage of strontium-90 is calculated using the formula (1/2)^(time/half-life). This results in about 12.9% remaining.

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