Keywords: CP-1 first operation record.svg Chicago pile-1 when the self-sustaining nuclear chain reaction was observed own <br/>Data extracted from http //ajp aapt org/resource/1/ajpias/v20/i9/p536_s1 Am J Phys 20 536 1952 Fig 3 Mikhail Ryazanov 2011-04-15 Cc-zero Nuclear technology Enrico Fermi Chicago Pile-1 |