October 17, 1940
Claim for an Invention from V. Maslov and V. Shpinel, 'About Using of Uranium as an Explosive and Toxic Agent'
In this letter two nuclear scientists from UIPhT described the construction of the nuclear bomb and proposed to start activities in producing of the nuclear arsenal and make these activities secret. Two Ukrainian physicists were first Soviet scientists who revealed the method of producing a nuclear weapon (of course they did not know about the similar inventions of western scientists which were made at the same time under great secrecy).
Technical Proposal of F. Lange, V. Maslov, and V. Shpinel, 'Fission of Uranium Isotopes by Using Method of Coriolis Acceleration'
Kharkov Institute scientists proposed in this document the concrete steps to build a nuclear weapon. The document demonstrates that Ukrainian physicists understood how to receive weapons grade uranium and elaborated concrete technical proposals to achieve this goal through uranium enrichment in centrifuge.