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An atomic bomb is a bomb that obtains its destructive energy from chain reactions of fissionable materials. The first atomic bomb used against human targets was dropped at 8:15am, 6 August 1945 on Hiroshima, Japan. 3 days later, a second bomb was dropped at 11:02am over Nagasaki. Survivors of these atomic bombings are known in Japanese as hibakusha. The method of making an atomic bomb was discovered by European scientists in 1938. A year later, Albert Einstein (1879-1955) sent …

…The majority of burns were flash burns. The temperature of the hypocenter, corresponding to the visible and infrared regions of the spectrum. Burn injuries occurred within 0.3 seconds of the explosion, with the greatest intensity of the radiant heat lasting 0.5 seconds. In Hiroshima, flash burns were observed among people within a radius of approximately 4.5km, although few serious burns were reported beyond 3km; flash burns occurring within 2km were for the most part third degree burns.