At a meeting on December 18 the S-1 project was dedicated to development of a uranium bomb.

They came to within an inch of not having enough material for a uranium bomb.

The gun program switched completely over to developing a uranium bomb.

I envision rather a uranium bomb, most likely a gun-type.

Note that it is entirely possible to make uranium bombs with the products of a thorium reactor.

It was assumed that the uranium gun-type bomb could then be adapted from it.

In contrast, the uranium bomb was straightforward if not trivial to design.

But the idea of a uranium bomb chilled him.

A compromise hypothesis, experts said, was that Pakistan had exploded a uranium bomb with a plutonium experiment on the side.

And it is much more efficient than your uranium bombs, Burt.