Abstract: PREPARATION AND STUDY OF 68Ge 68Ga GENERATOR——STUDY OF THE STABILITY OF 68Ge 68Ga GENERATORTang Qiming Zhao Guizhi Long Weizhong Li Dakang(Department of Isotope,China Institute of Atomic Energy,P.O.Box 275(43),Beijing 102413)ABSTRACTThe stability of the isotope generator of 68Ge 68Ga，including the elution curve of 68Ga,elution efficiency of 68Ga,breakthrough of 68Ge and the concentration of Sn in the elute are studied.The generator is eluted by 1 mol/L HCl at varying intervals from one day to fourteen days.The adsorbent of the generator is SnO2.Based on the elutions in a half year,these data are obtained:breakthrough of 68Ge is in the order of 10－7,the concentration of Sn in the elute is less than 4×10－7，the shape of the elution curve of 68Ga is unchanged,but the elution efficiency of 68Ga is varied from 55% to 75%. It is found that the varying elution interval does not change the elution efficiency of 68Ga and varying elution efficiency is caused by varying temperature.Key words 68Ge 68Ga Generator Stability Elution efficiency Breakthrough