Development Context
Little Boy (Mk-1) is best understood as a historical U.S. uranium atomic bomb. Little Boy was the atomic bomb used against Hiroshima on August 6, 1945, and was the first nuclear weapon used in warfare.
Overview
Little Boy (Mk-1) was the United States gun-type uranium fission bomb used against Hiroshima on 6 August 1945. The record is retained as a historical nuclear weapon entry rather than an in-service munition.
Specifications
General
NotesFirst nuclear weapon used in combat. Dropped on Hiroshima, Japan on August 6, 1945.
Yield Kt15 kt
Warhead TypeGun-type fission
Delivery SystemB-29 Superfortress (Enola Gay)
Research Notes
Design and Tradeoffs
The historically relevant contrast is that it used a different, simpler uranium gun-type concept from the plutonium implosion weapons, but its page should focus on effects and context rather than construction.
Service and Legacy
Its use and consequences remain central to World War II history, nuclear ethics, arms-control debates, and public memory of Hiroshima.
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