建立了一种测量核电厂液态流出物中14 C的分析方法———使用1030 W总碳分析仪将样品中的碳酸化、氧化成CO2，然后用NaOH溶液吸收，最后用3180液闪计数器对NaOH吸收液进行测量。该方法能够有效消除其他放射性核素的干扰，且能准确测定样品中14 C的活度。实验结果表明，方法的加标回收率平均为96．91％，探测限为2．07 Bq/L ，测定结果的精密度（相对标准偏差）小于±5％，准确度（相对误差）小于±5％。%By combining a 1030W total carbon analyzer and a 3180 liquid scintillation counter ,a method for measuring 14 C in NPP liquid effluents was established .It was achieved by using the total carbon analyzer to have the carbon in sample acidized and oxidized to carbon dioxide ,which was then absorbed with a sodium hydroxide solution ,and succeeded by liquid scintillation measurement .The method can effectively eliminate interference from other radionuclides ,and can accurately determine 14 C activity in the sample .The results show that its overall average recovery was 96 .91% ,detection limit was 2 .07 Bq/L ,and ,the precision (rela-tive standard deviation ) and accuracy (relative error ) of measurement results was less than ± 5% respectively .
展开▼
