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Damage from Radiation
The atomic bomb differed from previous bombs that used chemical explosives. It emitted energy at an entirely different level of magnitude, and it also emitted radiation. In Hiroshima, a vast amount of initial radiation was emitted within a minute after the bomb detonated. It caused terrible injuries to people's bodies. Almost all those who directly absorbed the radiation within one kilometer of the hypocenter died.
Residual radiation remained in the city. Because of this, even people who were not directly exposed but who came near the hypocenter for rescue and relief operations or to search for their families absorbed radiation. Many fell ill and some died.

œSoldier with Purpura, "Spots of Death"
September 3, 1945
This man was exposed in a house within one kilometer of the hypocenter. Ten days after the bombing, his hair began falling out and he bled from the gums. Blood collecting under his skin formed purple spots. His gums bled continuously. He died about one month after the bombing.
Photo: Gon-ichi Kimura
ŸBlack Rain
After the explosion, a huge mushroom-shaped cloud towered over Hiroshima. Twenty or thirty minutes later, it was picked up by a westward wind and drifted northeast, its shape gradually crumbling. The cloud rained black rain on the areas it passed over. The rain contained mud and dust stirred up by the explosion, soot from the fires, and radioactive materials. This black rain exposed even persons far from the hypocenter to radiation injury.
The difference between radiation and radioactivity