摘要
采用252Cf中子活化方法研制燃料棒235U富集度均匀性检测设备,用慢化后的252Cf中子照射燃料棒,使燃料棒UO2芯块中的235U发生裂变,通过测量其裂变产物的γ射线总强度对燃料棒235U富集度及其均匀性进行在线检测。采用1 2mg的252Cf中子源,能检测出燃料棒中235U富集度相对偏差±10%的单个混料芯块,单根燃料棒的检测速度可达7m/min,检测结果的置信概率为97 74%。
The developed scanner for scanning fuel rod 235U enrichment uniformity is based on the 252Cf neutron activation method, in which the delay gamma rays emitted by fission products from 235U fission induced by moderated 252Cf neutrons are counted along the fuel rod moved successively through the irradiator containing 252Cf neutron sources and the BGO crystal detectors at a constant speed by a mechanical conveyor. The present equipment has two channels for inspecting two fuel at the same time. When a 252Cf source of 1.2 mg is used, the single offspec pellet which deviates from normal enrichment by ±10% can be detected at the scanning speed of 7 m/min with 97.74% confidence.
出处
《原子能科学技术》
EI
CAS
CSCD
2003年第6期538-542,共5页
Atomic Energy Science and Technology
