Technique of analysis enrichment of Uranium samples

The different mass spherical uranium samples have been measured by high pure germanium gamma detector.Enrichment of uranium was analyzed by PCFRAM software.The relationship between the enrichment and measurement time,and different thick of shielding,and mass of the sample,and the different kind of models of sample have been analysed.The results show that reliability of the enrichment is determined by the measurement time at the certainty condition.Not shielding but statistics is important for the results.The accurate results will be obtained with high quality spectrum.The accurate enrichment of sample is not differentiated when high enriched uranium and depleted uranium exist.