The Soviet Union conducted a much more vigorous program of 122 nuclear tests, some with multiple devices, between 1965 and 1989 under the auspices of Program No. 7-Nuclear Explosions for the National Economy.
After the war, he then directed the DESTO Laboratories which was established to produced the high-atomic explosive materials and weapons.
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He organised a protest on 1 November 1961 in which he delivered a milk bottle labelled "Danger — Radioactive" to the Soviet Union embassy in London in protest at the detonation of Tsar Bomba, at 50 megatons the largest nuclear explosive to ever be tested.