This may be one part of a security plan for nuclear materials.

"He will not be able to get the nuclear material or the authority to do such a thing."

The use of nuclear materials to create weapons is always a concern.

The company is no longer involved in the transportation of nuclear material.

"We've told them we are not prepared to do that until they give up their nuclear materials", said Hill.

And will those countries be allowed to have the nuclear material to put on these missiles?

We've never confirmed they have access to any nuclear material.

"Because we need to know who al-Qaeda is about to get their nuclear material from."

"One of whom has been handling nuclear materials within the past few days."

I would like to include military and civil nuclear materials in the same framework.

The bomber would take off with no fissile material in the bomb.

For final determination, a test needs to be made with real fissile material.

The biggest challenge is making the fissile material to put inside it.

Individuals were trying to steal fissile material, the report said.

Even without a reactor, Iraq may already have the fissile material it needs.

Enough fissile material was not going to be available before mid-1945.

The plutonium-239 was very desirable because it is a fissile material.

India is said to have enough fissile material for perhaps 50 nuclear devices, maybe more.

Put the two together and you have the fissile materials for some literary fireworks.

There were many ways of arranging the fissile material into a critical mass.

"We have reason to believe that fissionable materials are involved."

Even if some nation desperate for fissionable material were to try and get it, they wouldn't have anything of military value.

The motivation behind the composite core was to make better use of the available fissionable material.

That much fissionable material was bound to attract some attention from a number of parties.

Which is how I wound up with thirty pounds of fissionable material.

"Do we know if the fissionable materials are in the hands of the North Korean military?"

"It is fortunate that I have a good supply of fissionable materials."

In some cases, she added, there were no computers available for keeping track of fissionable material.

The only question left to be solved now was which fissionable material the reactor used.

You don't have any idea what a high-energy burst would do to the fissionable material in your body.