MULTINUCLIDE METHOD FOR DETERMINATION OF FISSION QUANTITY OF MIXED FISSILE MATERIAL

A new methd──multinuclide method is proposed for the determination of fission quanti-ties of mixed fissile material.Both total fission quantity and partial fission quantities of individualfissile materials can be obtained simultaneously by determining the number of nucleus of some fis-sion products with linear least-square method,in which the virtual fission quantity is y axis andthe ratio of fission yields for fissile materials is x axis,i.e.n_i is virtual fission quantity;y￣A_i is yield of fission product i for fissile material A;Y￣B_i is yield of fis-sion product i for fissile material B;n￣A_f is fission quantity of A;n￣B_f is fission quantity of B;A and Bare fissile materials,The intercept at yaxis is fission quantity of A and the n_i vaule at Y￣B_i/Y￣A_i=1 istotal fission quantity.The key of using this method is how to select fission products and theiryields,The rule of selection of fission preducts is discussed.