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“When there's radiation damage caused to your body, you create reactive oxygen species and that causes downstream things to to impact your immune system and things like that while also suppressing your mitochondria,” Beheshti said.

The PVA made the drug more selective of tumor cells and prolonged drug retention, helping to spare healthy cells from unnecessary radiation damage.

In Mr Morris’s case, as the film reveals, he believes the death of his first child, Steven, in 1962, was the result of the radiation damage he suffered during Operation Grapple - the name given to a series of British nuclear weapons tests.

The researchers were surprised to find that, using several different analyses, they could not detect a signature of radiation damage on the genomes of the worms from Chornobyl.

The study is part of a larger campaign at the Wyss Institute aiming to investigate acute radiation damage across several organs and tissues.