Abstract: STUDY ON RADIOACTIVITY MEASUREMENT OF 188Re BY CERENKOV COUNTING(Department of Isotope, China Institute of Atomic Energy, Beijing 102413)Kouhei NK(Department of Radioisotopes, Tokai Research Establishment, Japan Atomic Energy Researh Institute)ABSTRACTThe method for the radioactivity measurement of 188Re in aqueous solution by Cerenkov counting using a conventional liquid scintillation counter is studied. The calibration curve is successfully obtained in the range from background to 1×106 Bq, with good precision to determine the radioactivity of 188Re. Effects of sample volume, type of the counting vial, solvent and turbidity quenching on the Cerenkov counting efficiency are observed. The results show that the Cerenkov counting efficiency of 188Re is more than 58% in water without addition of wavelength shifter.Key words Cerenkov counting 188Re radioactivity