One of the dangers of radioactive fallout from a nuclear
Chapter , Problem 79(choose chapter or problem)
One of the dangers of radioactive fallout from a nuclear bomb is its 90Sr, which decays with a 29-year half-life. Because it has chemical properties much like those of calcium, the strontium, if ingested by a cow, becomes concentrated in the cows milk. Some of the 90Sr ends up in the bones of whoever drinks the milk. The energetic electrons emitted in the beta decay of 90Sr damage the bone marrow and thus impair the production of red blood cells. A 1 megaton bomb produces approximately 400 g of 90Sr. If the fallout spreads uniformly over a 2000 km2 area, what ground area would hold an amount of radioactivity equal to the allowed limit for one person, which is 74 000 counts/s?
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