The fissile material commonly used in atomic bombs is uranium 235. The content of uranium 235 in nature is only 0.7%. It is necessary to separate uranium 235 from nature. This is a very difficult technology and requires tens of thousands of high-speed centrifuges to pass through thousands of times. The operation can only slightly improve the purity of uranium 235. Countries without certain industrial strength cannot complete this operation.
When the concentration of uranium 235 reaches 3%, it can be used as a raw material for nuclear power plants to generate electricity, and 90% can be used as weapon-grade enriched uranium. In addition to centrifugal separation of uranium 235, there is a gas diffusion method, but no matter which The methods are very difficult.