France would then convert the material into metal rods to be used by the Tehran reactor.

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Neutrons do not, so they escape and go thudding into the shielding material around the reactor.

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In addition to driving the turbines to create electricity, the steam generators are "one of the barriers between the radioactive material in the reactor core and ultimately the external environment, " Jaczko noted.

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The United States and other leading nations have been negotiating with Iran to send low-enriched uranium abroad to be turned into material for use in medical research and treatment at a reactor in Tehran.

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