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.