Abstract: 57Co SOURCE EXCITED KXRF ANALYSIS OF U AND Pu CONCENTRATIONS IN PWR SPENT FUEL REPROCESSING SOLUTIONJin Liyun Huang Qingliang Yuan Hui Li Yun Zhu LiangWang Liyu Ding Xixiang Liu Chong(China Institute of Atomic Energy,P.O.Box275(88), Beijing 102413)ABSTRACTAn analysis system composed of 57Co source excited KXRF apparatus and HPGe detectormultichannel computer is developed.According to requirements of control analysis of PWR spent fuel reprocessing process,a nondestructive,rapid analysis method for U and Pu concentrations has been investigated.The range of determination is 0.5-200 g/L with precision (sr) of 5.0%-1.5%.The effect of solution medium composition on determination of concentrations of U and Pu can be ignored.The method is well suited to control or inline analyze concentrations of U and Pu in PWR spent fuel reprocessing process.If　57Co transmission source is applied simultaneously,the method can also be suited to material accounting of U and Pu for nuclear safeguards.Keywords PWR spent fuel U Pu Kseries Xray fluorescence(KXRF) Control analysis of nuclear process