Plutonium and caesium isotopes in upper atmosphere, from bomb testing
Nuclear weapon test debris ‘persists’ in atmosphere By Rebecca Morelle Science reporter, BBC World Service, 7 Jan 14, Radioactive particles from nuclear tests that took place decades ago persist in the upper atmosphere, a study suggests.
Previously, scientists believed that nuclear debris found high above the Earth would now be negligible.
However this research shows that plutonium and caesium isotopes are still present at surprisingly high concentrations…The work is published in the journal Nature Communications……..http://www.bbc.co.uk/news/science-environment-25641310
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