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

Question 93

Multiple Choice

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


A) 33.9%
B) 2.95%
C) 87.1%
D) 0.129%
E) 12.9%

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