41.   But the benefit of controlling nuclear materials and weapons of mass destruction in order to keep them from terrorists or unfriendly countries is incalculable, Galbraith said.

42.   But the episode indicates trafficking in nuclear materials remains a major worry.

43.   But these officials cautioned that it is impossible to make a blanket assertion that al-Qaida possesses no nuclear material.

44.   But the United States will not relinquish its rights to traverse the region with ships powered by or armed with nuclear materials.

45.   But they add that the nation also has to promote tight controls on nuclear materials, some of which have common industrial and medicinal uses.

46.   Caches of nuclear material spread throughout the former Soviet Union remain a big headache, though headway has been made in assuring their security.

47.   Chilling stories continue to emerge from Russia about nuclear material for sale.

48.   Christopher also held out the prospect of an agreement to combat the smuggling of weapons-grade nuclear material.

49.   Cirincione at the Carnegie Endowment said one of the most dangerous possibilities is that bin Laden could acquire a nuclear explosive device or nuclear materials for contamination.

50.   Clinton expects to strike agreement with his counterparts on steps to thwart illicit shipments of nuclear materials to rogue nations such as Iraq, Iran and Libya.