Konstantin Petrzhak

Konstantin Antonovich Petrzhak (alternatively Pietrzak; Russian: Константи́н Анто́нович Пе́тржак, IPA: [kənstɐnʲˈtʲin ɐnˈtonəvʲɪtɕ ˈpʲedʐək], Polish: [ˈpjɛt.ʂak]; 4 September 1907– 10 October 1998) was a Russian nuclear physicist of Polish origin, and a professor of physics at the Saint Petersburg State University. Receiving credit with Georgy Flyorov, a physicist, for the discovery of spontaneous fission of uranium in 1940, he also greatly aided in Russia's atomic bomb project.

Konstantin Petrzhak

Konstantin Antonovich Petrzhak (alternatively Pietrzak; Russian: Константи́н Анто́нович Пе́тржак, IPA: [kənstɐnʲˈtʲin ɐnˈtonəvʲɪtɕ ˈpʲedʐək], Polish: [ˈpjɛt.ʂak]; 4 September 1907– 10 October 1998) was a Russian nuclear physicist of Polish origin, and a professor of physics at the Saint Petersburg State University. Receiving credit with Georgy Flyorov, a physicist, for the discovery of spontaneous fission of uranium in 1940, he also greatly aided in Russia's atomic bomb project.