Blast effect falls off approximately as distance cubed, because the overpressure wave deposits energy in the volume and disperses gradually. Thermal radiation, on the other hand, falls of as distance squared, more or less. This is why the main damage mechanism goes from radiation to blast to thermal as the bomb gets larger.
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Blast effect falls off approximately as distance cubed, because the overpressure wave deposits energy in the volume and disperses gradually. Thermal radiation, on the other hand, falls of as distance squared, more or less. This is why the main damage mechanism goes from radiation to blast to thermal as the bomb gets larger.