An explosion in a nuclear reactor spread the isotope caesium-137 across a large area.
Ninety years after the explosion, the quantity of caesium-137 present will be 12.5% of its original level.
What is the half-life of caesium-137?
1 )
11.25 years
2 )
22.5 years
30.0 years
4 )
45.0 years
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