Uranium enrichment determination by high-energy photon interrogation

Uranium enrichment determination by non-destructive assay is an important method in authenticating the nuclear warhead or uranium component in deep nuclear reduction verifications.In this paper,the feasibility of applying the high-energy photon interrogation to determine the uranium enrichment is studied.Simplified models are presented which were simulated by particle Monte Carlo transport code.The results indicate that the relation curves of the released neutrons and the enrichment of uranium objects are almost linear.For a uranium object of a given shape,the uranium enrichment can be obtained with the relation curves,which could be got in advance by calibration experiments or simulations.