Since uranium and plutonium are nuclear weapons materials, there have been proliferation concerns.

The department last successfully ran a reactor to make weapons material in 1988.

Thus, the moment may well be ripe for a negotiated halt in production of nuclear weapons materials.

Why would governments require a source for weapons material when they have more than enough of it as it stands?

Biological weapons materials are another matter, because they can be smaller, harder to detect and easier to move.

Iraq is required under Council resolutions to allow inspectors to go anywhere to search for weapons material or documents.

He added that the department might not need all three reactors to meet the nation's needs for weapons material.

UN inspectors believe there to be large quantities of weapons materials still unaccounted for.

All weapons, artillery material and gold was left to plunder.

"The isotope that Abramanov discovered will make an excellent weapons material."