Уран в установке умножения нейтронов использовали. Вот статья на CNN. Но что характерно, там был высокообогащенный уран 93,4%, а Иран собираются бомбить лишь за то, что он уран до 20% обогащает. http://edition.cnn.com/2012/05/15/us/new-york-kodak-uranium/index.html
According to a spokesman for the Nuclear Regulatory Commission, Kodak's uranium was highly enriched -- to a level approaching 93.4%. That is the type of weapons-grade material that U.S. government agencies are trying to prevent terrorists from getting their hands on. (For the sake of comparison, Iran claims to have enriched uranium to 20%, leading Western nations to impose sanctions on the country in an effort to prevent Iran from pursuing further enrichment.)