加速器质谱法测定核电站排水口水样中的~(129)I

he target samples are prepared for measuring 129I in seawater, using isotope dilution, extraction-back extraction and precipitation etc.. The total content of iodine in seawater samples were measured by using spectrophotometer method. The 129I in the seawater samples near nuclear power plant is determined using the 3 MV Tandetron-tandem accelerator mass spectrometer at the Xi’an AMS Center. The 129I level and distribution of the liquid discharges from nuclear power plants has been analyzed. The 129I/127I ratio in seawater near nuclear power plant is 1.6×10-11～6.7×10-11, approximately one order of magnitude higher than that in seaweed collected in the pre-nuclear age, and as the same order as that from locations without direct exposure to the emission from nuclear installations, influenced only by global fallout.