Source: Pictures of World War II, U.S. National Archives
& Records Administration, Japan #164, Atomic Bomb Survivor CIRCA 1945, 77-MDH-6.55b.
Skin burn pattern corresponding to the dark portions of a kimono worn at the time of the atomic explosion, 1945.
Thermal / Burn injury
Direct absorption of thermal energy through exposed the skin or heating or ignition of clothing (flash burns)
Indirect action of fires caused in the environment (flame burns)
Burn casualties, and it is expected there would be many, may result from the absorption of thermal radiation energy.