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

The most commonly used fissile materials for nuclear weapons applications have been uranium-235 and plutonium-239.

It is a different matter to say that their production facilities for fissile materials should, at this stage, be abandoned.

There is a pressing case for the nuclear nations to deny fissile materials to would be customers.

The military bomb boys can churn out their own fissile materials without difficulty.

It is absolutely essential to monitor all flows of fissile materials and other nuclear wastes.

That would still leave the problem of fissile materials produced under the cover of civilian nuclear power programs.

Three empty bombs plus fissile materials make three nuclear weapons in a few minutes.

The plant's fissile materials manufacturing capability has been neutralized according to plan."

By definition, fissile materials can sustain a chain reaction with neutrons of any energy.

There is also traffic in fissile materials.

World inventories of weapons-grade fissile materials are substantial, much greater than now needed for military purposes.

"Our strong position is that Iran is preparing, instead, to produce fissile materials for nuclear weapons.

It is also vital to extend the reach of the nonproliferation treaty with a proposed new fissile materials agreement.

Once Iran starts enriching uranium, the general said, it will need just six months to a year to achieve the ability to produce fissile materials.

Water was also a risk, since it could serve as a moderator between the fissile materials and cause a violent dispersal of the nuclear material.

The second is the non-proliferation of nuclear weapons and, of course, of fissile materials.

The top priority in the fight against nuclear terrorism must be to safeguard all fissile materials that would make such terrorism possible.

Criticality testing involved bringing masses of fissile materials to near-critical levels to establish their critical mass values.

We should provide substantially more money to help Russia dismantle nuclear weapons and safely dispose of bomb-grade fissile materials.

Sophisticated terrorists would be able to make an atomic bomb if they could get the necessary fissile materials - highly enriched uranium or plutonium.

As a result, fissile materials (such as uranium-235) are a subset of fissionable materials.

This radioactive super-heavy hydrogen isotope is used to boost the efficiency of fissile materials in nuclear weapons.

A drawback of this process is that it requires targets containing uranium-235, which are subject to the security precautions of fissile materials.

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

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

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

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

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

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.

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

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.

Iraq could produce a nuclear weapon if it managed to buy fissile material on the black market.

It contained a critical mass of fissile material, together with control rods.

Imports of fissile material from outside would considerably speed up the programme.

The project was unsuccessful as there were problems finding and paying for the necessary fissile material.

The most commonly used fissile materials for nuclear weapons applications have been uranium-235 and plutonium-239.

"Russia has no reliable inventory of its fissile material," the report said.

Should Iraq acquire fissile material, it would be able to build a nuclear weapon within a year.

The regime is seeking a nuclear bomb and with fissile material could build one within a year.

To make the fissile material, he needs to develop an ability to enrich uranium.

An effective embargo was in place to prevent Iraq from acquiring fissile material.

The obstacle, he knew, was no longer sufficient quantities of fissile material.

We quickly need a global inventory on fissile material.

Then they will use its suns to burn another system into fissile material to sell.

India is estimated to have enough fissile material for more than 150 warheads.

It is a different matter to say that their production facilities for fissile materials should, at this stage, be abandoned.