DETERMINATION OF ~(129)I IN LIQUID EFFLUENT OF NUCLEAR FACILITY

An analitical method for 129I in liquid effluent of nuclear facility is studied .Anion exchange resin is used to concentrated the iodine in water sample,it is extracted by CCl 4 and stripped by NaHSO 3 solution, 129I is measured by HPGe γ spectrometer in the form of AgI precipitation,it can also be determined by liquid scintillation analyzer directly after purification.For γ spectrometer measurement,the counting efficiency is deduced with the increasing of mass thickness.For liquid scintillation analyzer,it has counting efficiency of 85%.The lowest detective limits of the method is 0.016 Bq/L and 0.037 Bq/L for γ spectrometer and liquid scintillation analyzer,respectively,while the counting time is 1 000 min and 100 min respectively.The whole process recovery is range of 60%～85%.