June 1942

June 1942

J. Robert Oppenheimer joins the Chicago Met Lab to lead an effort on fast neutron physics, and prepares an outline for the entire neutron physics program. Production of plutonium through marathon irradiation by cyclotron begins. Chicago Met Lab engineering council begins developing plans for large scale plutonium production reactors. President Roosevelt approves a plan for spending $85 million for a weapon development program.

Date Range: 
1942CE Jun