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Radioactive chlorine gas leaking out of Antarctica's ice sheets

Radioactive chlorine is still oozing out of Antarctica's ice sheets following the nuclear bomb tests in the 1950s and 60s. A particular type of radioactive chlorine, chlorine-36, has been traced in the Vostok area of the icy continent. It reached there after becoming airborne when the US military tested nuclear weapons in Pacific Oceans 60 years ago. It’s trapped there ever since and is still releasing into the environment.