Russia's state weather agency said on Monday it had found the radioactive i...
FILE PHOTO: Russian President Vladimir Putin attends a meeting in Moscow, August 22, 2019. Alexander Zemlianichenko/Pool via REUTERS/File Photo
The deadly accident on Aug. 8 caused a brief rise in radiation levels in the nearby city of Severodvinsk. President Vladimir Putin later said the mishap occurred during testing of what he called promising new weapons systems. The isotopes were Strontium-91, Barium-139, Barium-140 and Lanthanum-140, which have half-lives of 9.3 hours, 83 minutes, 12.8 days and 40 hours respectively, it said.
U.S.-based nuclear experts suspect the incident occurred during tests of a nuclear-powered cruise missile.
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