I Can Use U-235 that’s Only 40% enriched in My Atomic Rocket Nozzle.

The Haqqani Network in Pakistan want gold ingots for this sub-weapons grade material.

I infuse it onto Graphene Tape.

I expose sections of said tape to neutrons from Beryllium/Polonium collision events.

I don’t want an explosion, I want big heat. I want to expel the U-238 and also Lead out of the nozzle as plasma moving at big v squared.

Since the m is big, the thrust produced is good enough to yield 1 G of acceleration for 1/2 the trip. Then the spaceship must flip and give 1 G going the opposite way. I can get to my destination at a speed that is low. For the Belt or the moons of Jupiter this does matter.

My nozzle contains Rhenium/Osmium/Iron alloy so it can take high heat.

It is never used inside the atmosphere of Earth.

The atomic fuel and reaction mass are raised to orbit or L-5 points using regular rockets.

The graphene tape is on reels or spools that turn fast and supply huge thrust.