The Atomic Bombings of Hiroshima and Nagasaki

The Atomic Bombings of
Hiroshima and Nagasaki


This report describes the effects of the atomic bombs which
were dropped on the Japanese cities of Hiroshima and
Nagasaki on August 6 and 9, 1945, respectively. It summarizes
all the authentic information that is available on
damage to structures, injuries to personnel, morale effect,
etc., which can be released at this time without prejudicing
the security of the United States.
This report has been compiled by the Manhattan Engineer
District of the United States Army under the direction
of Major General Leslie R. Groves. Special
acknowledgement to those whose work contributed largely
to this report is made to:
The Special Manhattan Engineer District Investigating
Group, The United States Strategic Bombing Survey, The
British Mission to Japan, and The Joint Atomic Bomb Investigating
Group (Medical). and particularly to the following
individuals:
Col. Stafford L. Warren, Medical Corps, United States
Army, for his evaluation of medical data, Capt. Henry L.
Barnett, Medical Corps, United States Army, for his evaluation
of medical data, Dr. R. Serber, for his comments on
flash burn, Dr. Hans Bethe, Cornell University, for his information
of the nature of atomic explosions, Majors
Noland Varley and Walter C. Youngs, Corps of Engineers,
United States Army, for their evaluation of physical damage
to structures, J. 0. Hirschfelder, J. L. Magee, M. Hull,
and S. T. Cohen, of the Los Alamos Laboratory, for their
data on nuclear explosions, Lieut. Col. David B. Parker,
Corps of Engineers, United States Army, for editing this
report.