<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.wataalam wanasema pounds 550 250 kilo ya uranium hiyo ya 20 iliyoingizwa inahitajika ili kuzalisha warhead moja.  <response>: experts say 550 pounds 250 kilograms of 20 percent-enriched uranium are needed to produce a single warhead 