NUCLEAR FUEL is a material which can be

used or consumed by nuclear fusion or fission to

derive NUCLEAR ENERGY

The only Fissionable nuclear fuel occurring in

nature is URANIUM , of which is 99.3% U-238

and 0.7% is U-235 and U-234 is only a trace.

The other fissionable materials are Pu-239

and U-233 which can be produced artificially

from U-238 and Th-232.

NUCLEAR FUEL IS SAID TO BE

EFFICIENT IF IT PRODUCES A

LOT OF ENERGY AND A VERY

SMALL BIT OF POLLUTANT.