Some articles on tsarapkin:

Laboratory B In Sungul’ - Scientific Divisions - Radiobiophysics
... the Russians sent Timofeev-Resovskij, and his colleague Sergei Romanovich Tsarapkin, to Germany ... basis of false denunciations, Timofeev-Resovskij and Tsarapkin were arrested by the NKVD in September 1945, returned to Russia, and both sentenced to 10 years in the Gulag ... Timofeev-Resovskij’s talents in the Soviet atomic bomb project, had Timofeev-Resovskij and Tsarapkin sent to Laboratory B in 1947 ...