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Strontium 90 is one of the harmful nucli...

Strontium 90 is one of the harmful nuclides resulting from nuclear fission explosions.
Strontium 90 decays by beta particle emission with a half life of 28 years. How long (in years) would it take for 99.0% of a sample of strontium-90 released in an atmospheric test of an atomic bomb to decay? (log 2 = 0.30)

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