The main risk inside the storage facility is the chemical toxicity of uranium hexafluoride gas and fluoride compounds generated in contact with water. The radiological risk from enriched uranium at Natanz is likely to be much smaller than the chemical toxicity from the fluorine.

By Andrew MacAskill, Federico Maccioni and Pesha Magid LONDON/DUBAI (Reuters) -Israel's strikes on Iran's nuclear installations so far pose only limited risks of contamination, experts say. But they warn that any attack on the country's nuclear power station at Bushehr could cause a nuclear disaster.

Israel has struck a series of nuclear facilities across Iran, including its largest enrichment site, Natanz, key buildings at its Esfahan complex, factories that make centrifuges to enrich uranium, and its still-under-construction heavy-water reactor at Khondab.