Hiroshima

Hiroshima is a city in western Japan, devastated by the first wartime use of an atomic bomb on August 6, 1945.

Atomic bombing of Hiroshima: The United States’ use of an atomic bomb against Hiroshima on August 6, 1945. The attack that made the city a defining event in nuclear history.
Little Boy: The uranium gun-type atomic bomb detonated over Hiroshima on August 6, 1945. It was the weapon used against the city.
Manhattan Project: The United States-led wartime program that developed the first nuclear weapons. It produced the bomb later used against Hiroshima.
Hibakusha: The Japanese term for survivors of the atomic bombings of Hiroshima and Nagasaki. Hiroshima’s survivors became central witnesses to nuclear harm.
Hiroshima Peace Memorial: The preserved ruins of the former Hiroshima Prefectural Industrial Promotion Hall, near the atomic bomb’s hypocenter. Its damaged structure became a physical record of the bombing.
Nuclear fission: The splitting of an atomic nucleus into lighter nuclei, releasing energy and usually neutrons. Fission in the bomb’s uranium released the energy that devastated Hiroshima.
Harry S. Truman: The 33rd president of the United States, who authorized the use of atomic bombs against Japan. His administration made the decision to use the weapon against Hiroshima.
Acute radiation syndrome: A pattern of illness caused by high doses of ionizing radiation received over a short period. It explains many severe illnesses and deaths after the bombing.
Hiroshima Peace Memorial Museum: A museum documenting the atomic bombing of Hiroshima and its consequences. Its artifacts and testimony preserve the attack’s human history.
Hypocenter: The point on Earth’s surface directly beneath an explosion’s burst point. Hiroshima’s damage and memorial geography are organized around this location.

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