Damage from the Heat Ray
The temperature at the center of the fireball generated by the atomic
bomb at the moment of detonation was more than 1 million degrees Celcius.
One second later, the fireball had grown to its maximum diameter of
280 meters. The fierce heat ray emitted from that fireball raised surface
temperatures at the hypocenter to 3,000°C to 4000°C. (The surface temperature
of the sun is 5,700°C; iron melts at 1500°C.)
●A Schoolgirl with Burns
August 10, 1945
Those exposed to the ferocious heat ray sustained serious burns. Skin
exposed directly to the heat ray (with nothing to shield it) within
roughly 1.2 kilometers of the hypocenter was burned to black char.
Even internal organs were affected. Virtually everyone burned in this
way died immediately or within a few days.
Courtesy: Asahi Shimbun
All rights reserved by the Asahi Shimbun.
●A man burned by the heat ray except
where his waistband covered him
August 7, 1945
This man exposed within a kilometer of the hypocenter was critically
burned over his whole body except where his waistband covered him.
●This woman's kimono pattern was
burned into her skin.
Around August 15, 1945
Because dark colors absorb heat more readily than light colors, the
heat ray burned the dark parts of this woman's kimono pattern into
●Road imprinted with the shadow of the bridge
Around November 1945
The heat ray scorched and blackened the asphalt, but it remained white
where the bridge railing blocked the rays.