People saying they wouldn't have used them due to radiation seem to have forgotten this was the 1940s. Airbursts also produce negligible fallout and the allies could likely defeat most bunkers of the era (I'd be shocked if bunkers of the era could survive 50PSI overpressure let alone a few hundred) with low airbursts.
You're also overstating the risk of harm to the delivery aircraft. There are other delivery methods than freefall such as parachute retardation. My rough calculations give a Lancaster being about 5km from detonation if it dropped the weapon at 20kft. At 5km the overpressure is only 1PSI, but by the time the shockwave reaches the aircraft the aircraft will be another 2.5km away and the overpressure will be even less. It's not a suicide mission and is very survivable.
You're also overstating the risk of harm to the delivery aircraft. There are other delivery methods than freefall such as parachute retardation. My rough calculations give a Lancaster being about 5km from detonation if it dropped the weapon at 20kft. At 5km the overpressure is only 1PSI, but by the time the shockwave reaches the aircraft the aircraft will be another 2.5km away and the overpressure will be even less. It's not a suicide mission and is very survivable.
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