Los Alamos in WW2 History | World War II Database

6 Nov 1942

United States

Groves and Oppenheimer visited Los Alamos, New Mexico, United States and agreed that it was suitable as the location for Site Y for the Manhattan Project. ww2dbase [Operation Trinity and Manhattan Project | Los Alamos, New Mexico | CPC]

5 Apr 1944

United States

At Los Alamos, New Mexico, United States, Emilio Segrè received the first sample of reactor-refined plutonium from Oak Ridge, Tennessee, United States. He would soon discover that the spontaneous fission rate of this plutonium was too high for use in a gun-type fission weapon. ww2dbase [Operation Trinity and Manhattan Project | Los Alamos, New Mexico | CPC]

4 Jul 1944

United States

J. Robert Oppenheimer revealed Emilio Segrè's final measurements to the Manhattan Project scientists at Los Alamos, New Mexico, which concluded that the "Thin Man" design for a gun-type plutonium weapon was not feasible. ww2dbase [Operation Trinity and Manhattan Project | Los Alamos, New Mexico | CPC]

20 Jul 1944

United States

The staff at the Los Alamos site of the Manhattan Project shifted focus to work on the implosion mechanism for the atomic bomb. ww2dbase [Operation Trinity and Manhattan Project | Los Alamos, New Mexico | CPC]

10 May 1945

United States

Manhattan Project Target Committee met at Los Alamos, New Mexico, United States to compile a list of potential atomic weapon targets in Japan. ww2dbase [Atomic Bombing of Hiroshima and Nagasaki | Los Alamos, New Mexico | CPC]

21 Aug 1945

United States

At Los Alamos, New Mexico, United States, American physicist Harry Daghlian, Jr. of the Manhattan Project accidentally dropped a tungsten carbide brick onto a plutonium bomb core and received a fatal dose of 510 rems of radiation. ww2dbase [Harry Daghlian | Los Alamos, New Mexico | CPC]

29 Aug 1945

Photo(s) dated 29 Aug 1945

15 Sep 1945

United States

American Manhattan Project physicist Harry Daghlian, Jr., after receiving a fatal dose of radiation during an accident on 21 Aug, died from radiation poisoning in Los Alamos, New Mexico, United States. ww2dbase [Harry Daghlian | Los Alamos, New Mexico | CPC]

16 Oct 1945

United States

Robert Oppenheimer resigned as the director of the Los Alamos, New Mexico, United States facility of the Manhattan Project. ww2dbase [Operation Trinity and Manhattan Project | Robert Oppenheimer | Los Alamos, New Mexico | CPC]

17 Oct 1945

United States

Norris Bradbury succeeded Robert Oppenheimer as the director of the Los Alamos, New Mexico, United States facility of the Manhattan Project. ww2dbase [Operation Trinity and Manhattan Project | Los Alamos, New Mexico | CPC]

Timeline Section Founder: Thomas Houlihan
Contributors: Alan Chanter, C. Peter Chen, Thomas Houlihan, Hugh Martyr, David Stubblebine
Special Thanks: Rory Curtis

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