Damage Caused by the Flash of Heat

In the area near the hypocenter, everything combustible burst into flames as a result of the tremendous flash of heat. Glass melted, ceramic roof tiles bubbled and rocks turned black, leaving permanent evidence of the ferocity of the flash. Although the temperature decreased with distance, clothing, telephone poles and trees as far as 2 kilometers from the hypocenter were burned or scorched.


Roof tiles exposed to the explosion within 200 meters of the hypocenter


The surface of ceramic roof tiles boiled when exposed directly to the heat flash, leaving a distinctive bubbling pattern. The bubbles, which were larger the shorter the distance to the hypocenter, remain as evidence of the tremendous heat generated by the atomic bomb. Roof tiles have shown a similar phenomenon when exposed to temperatures of 1,800 C for four seconds in experiments.


Scorched stones from a shrine garden


Spread out on the floor of a garden at Gokoku Shinto Shrine, about 800 meters northwest of the hypocenter, these stones were exposed to the ferocious flash of heat generated by the atomic bomb explosion. The exposed surfaces turned black and cracked in some places. (Donated by Masato Araki)


Bamboo with scars from the heat rays


This bamboo was cut down in a grove about three kilometers from the hypocenter.

(Donated by Taro Tasaki and Jinemon Tanaka)


Melted coins


These coins were piled in a stack when exposed to the heat rays. As a result of the difference in melting point, some of the coins fused together, evidence of the fierce, instantaneous heat released by the atomic bomb explosion.

(Donated by Kiyoshi Tsuruta)


Work clothing and cap


A worker was wearing this outfit when exposed to the atomic bombing at Mitsubishi Nagasaki Steel Works, about 1.2 kilometers from the hypo-center. The parts exposed directly to the heat rays are scorched black.

(Donated by Mitsubishi Steel Works)


Helmet with the remains of a skull


Part of the victim's skull remains on the inner surface of this helmet found near the hypocenter.

(Donated by Atsuo Harada)


Model of keloid scars


Models of the keloid scars suffered by an atomic bomb survivor.