Multiple Choice
90Sr is an isotope produced from atmospheric testing of nuclear bombs. If nuclear testing was stopped in 1960, what percentage of radioactivity due to 90Sr remained in 2000? The half-life of 90Sr is 28.5 years.
A) 62.2 %
B) 37.8 %
C) 12.3 %
D) 0.85 %
E) virtually 0 %
Correct Answer:
Verified
Correct Answer:
Verified
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