What are the nuclear contamination risks from Israel's attacks on Iran?

Darya Dolzikova, a senior research fellow at London think tank RUSI, said attacks on facilities at the front end of the nuclear fuel cycle - the stages where uranium is prepared for use in a reactor - pose primarily chemical, not radiological risks. At enrichment facilities, UF6, or uranium hexafluoride, is the concern. "When UF6 interacts with water vapour in the air, it produces harmful chemicals," she said.