31.   A threshold state would be best able to incorporate vagabond nuclear material or even to integrate complete nuclear warheads into an ongoing weapons-building program.

32.   British officials told their American counterparts that London considered the operation important enough to make an exception to its regulations against accepting foreign nuclear material.

33.   But August came and went, and instead of taking the nuclear material, the Russians voiced new concerns.

34.   Bush welcomed agreements on disposal of nuclear materials and establishment of a joint center to monitor missile launchings, he said.

35.   But because of the lower radioactivity of those nuclear materials, the trick to detecting them is to look for the subatomic particles with no electrical charge called neutrons.

36.   But Davis declined to comment on whether any high-level nuclear material, like spent fuel rods, was also in transit again.

37.   But he warned that a plane crash might cause an explosion of other stored nuclear material and disperse cancer-causing plutonium.

38.   But it also would mean that more nuclear material would be deployed all over Russia that could be diverted, increasing proliferation concerns.

39.   But officials at the Los Alamos National Laboratory said they were confident that the nuclear material and chemical explosives were protected, even if the laboratory itself started burning.

40.   But Russia was already swamped with its own nuclear material and had no interest in paying the Kazakhs for the supply, American officials said.