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A 1 megaton nuclear bomb produces 0.45 kg of an isotope of 90Sr and the fallout...

A 1 megaton nuclear bomb produces 0.45 kg of an isotope of 90Sr and the fallout spreads uniformly over an area of 110 km2 . 90Sr decays with a half-life of 29 years. Determine the ground area that holds an amount of radioactivity equal to 9.2 x104 Bq. Define variables used.

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