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Which uranium enrichment method presents the highest proliferation risk due to its potentially smaller physical footprint and relative ease of concealment?



Laser enrichment, specifically Atomic Vapor Laser Isotope Separation (AVLIS), presents the highest proliferation risk among uranium enrichment methods due to its potentially smaller physical footprint and relative ease of concealment compared to methods like gaseous diffusion or gas centrifuge enrichment. AVLIS works by using precisely tuned lasers to selectively ionize uranium-235 atoms in a vaporized stream of uranium. These ionized U-235 atoms are then separated from the non-ionized U-238 atoms using electromagnetic fields. Because AVLIS technology can potentially achieve high enrichment levels in fewer separation stages than other methods, a facility using AVLIS could be significantly smaller and require less power. This smaller size and potentially lower power consumption make it easier to conceal from international monitoring efforts. Furthermore, the key components of an AVLIS system, while technologically advanced, may be more readily available on the open market or easier to manufacture covertly than the specialized equipment needed for gaseous diffusion or large-scale centrifuge plants. The relative compactness and concealability of AVLIS increase the risk of a state secretly developing a uranium enrichment capability for nuclear weapons purposes without detection by international safeguards.