Determination of ⁹⁹Tc in the Reprocessing Plant by Liquid Scintillation Counting Method Through Extraction of 2, 6-Dimethly Pyridine

An analysis method by extraction and separation of 2, 6-dimethly pyridine by liquid scintillation counting method is researched for the determination of ⁹⁹Tc in the process feed in the reprocessing plant. Examination of disturbance and dispelling to determine ⁹⁹Tc is done by using uranium, neptunium, plutonium and fission product, and separation condition and liquid scintillation counting condition are optimized. Simulated samples are analyzed under determined conditions. The results show that s_r is better than 5%（n=6）, and recovery rate of ⁹⁹Tc is between 95% and 105%.