# MEASUREMENT OF $^{235}U$ ENRICHMENT USING THE SEMI-PEAK-RATIO TECHNIQUE WITH CdZnTe GAMMA-RAY DETECTOR

• Ha, J.H. (Korea Atomic Energy Research Institute) ;
• Ko, W.I. (Korea Atomic Energy Research Institute) ;
• Lee, S.Y. (Korea Atomic Energy Research Institute) ;
• Song, D.Y. (Korea Atomic Energy Research Institute) ;
• Kim, H.D. (Korea Atomic Energy Research Institute) ;
• Yang, M.S. (Korea Atomic Energy Research Institute)
• Published : 2001.09.30

#### Abstract

In uranium enrichment plants and nuclear fuel fabrication facilities, exact measurement of fissile isotope enrichment of uranium is required for material accounting in international safeguards inspection as well as process quality control. The purpose of this study was to develop a simple measurement system which can portably be used at nuclear fuel fabrication plants especially dealing with low enriched uranium. For this purpose, a small size CZT (CdZnTe) detector was used, and the detector performance in low uranium gamma/X -rays energy range was investigated by use of various enriched uranium oxide samples. New enrichment measurement technique and analysis method for low enriched uranium oxide, so-called, 'semi-peak ratio technique' was developed. The newly developed method was considered as an alternative technique for the low enrichment and would be useful to account nuclear material in safeguarding activity at nuclear fuel fabrication facility.