1945 Jan 18

1945 Jan 18

The Dragon experiment conducted by Otto Frisch, in which a U-235 hydride slug is dropped through a barely subcritical U-235 hydride assembly, creates the world's first assembly critical through prompt neutrons alone (prompt critical). The largest energy production for a drop is 20 megawatts for 3 milliseconds (the temperature rises 6 degrees C in that time).

Date Range: 
1945CE Jan 18th