It's carrying four and a half tons of highly unstable plutonium.

He even shows why Japan needs a ton of plutonium when cheaper uranium could be used instead.

America will need to dispose of more than 50 tons of excess plutonium.

World figures quote something like three thousand tons of plutonium in existence.

Under the new plan, 34 tons of plutonium will be converted into fuel for nuclear reactors.

A ton of plutonium can go even further.

That reactor is still producing half a ton of plutonium a year, enough to make a hundred bombs.

As of 2006 Japan owned approximately 45 tons of separated plutonium.

Q.: I saw a headline about plans to destroy tons of weapons-grade plutonium.

And in Vietnam, they hadn't been worried about two tons of plutonium stored below decks either.