(VOVworld)-Iran says it has significantly reduced its stock of 20 percent-enriched uranium by converting it to reactor fuel. Iranian nuclear chief Ali Akbar Salehi said the country's stocks of 20 percent-enriched uranium has fallen from 240 kilograms to around 140 kilograms as it is converted into fuel for a medical research reactor. Salehi said the remainder is also being converted. The announcement aims to ease international concerns over its nuclear program. The West remains concerned over Iran's continuing production of 20 percent uranium, which is enriched to a higher level than that used to fuel most energy reactors and is closer to the 90 percent needed for a warhead.