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The last live B53 munition began diasassembly in Texas today, 23 October 2011. This was the largest nuclear weapon in the US Arsenal at 9 megatons. The following is a quote from the Wikipedia article on the B53. The yield is projected- not all nuclear weapons were live tested in the open-

Effects

Assuming a detonation at optimum height, a 9 megaton blast would result in a fireball some 4 to 5 kilometers (2.5 to 3 miles) in diameter.[10] The radiated heat would be sufficient to cause lethal burns to any unprotected person within a 28.7 kilometers (17.8 mi) radius (995 square miles (2,580 km2)). Blast effects would be sufficient to collapse most residential and industrial structures within a 14.9-kilometer (9.3 mi) radius (300 square miles (780 km2)); within 5.7 kilometers (3.5 mi) virtually all above-ground structures would be destroyed and blast effects would inflict near 100% fatalities. Within 4.7 kilometers (2.9 mi) a 500 rem dose of ionizing radiation would be received by the average person, sufficient to cause a 50% to 90% casualty rate independent of thermal or blast effects at this distance.

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Q: What was the radius of the B53 bomb explosion?
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