【摘要】 对尿液中钚含量进行分析是对钚操作者内照射剂量估算的主要手段。本工作采用强碱性阴离子交换树脂柱分离纯化尿样,对尿中痕量水平钚分析中前处理化学条件进行了优化研究。优化后处理条件为:平衡后离子交换柱酸度为7~8 mol/mL;吸附流速为0.5~0.8 mL/min;解吸流速为0.2~0.3 mL/min;解吸液为10 mL;脉冲电镀电流为0.5 A;电流频率为2 000 Hz;占空比为1∶2;电镀时间为2 h。采用优化处理条件后,全流程加入的指示剂为4.23×10-3Bq标准238Pu溶液时,全程回收率为66.0%。结果表明,优化条件后,回收率提高10%~15%,且大大缩短了分析测量时间。更多还原

【Abstract】 Analysis of plutonium in urine is the primary method to calculate the irradiation dose of plutonium handlers.The chemical pre-treatment precedure for analysis of trace level plutonium in urine were inveitigated.The optimized conditions were follows as: acidity of 7-8 mol/mL,adsorption rate of 0.5-0.8 mL/min,desorption rate of 0.2-0.3 mL/min,desorption solution of 10 mL,pulse plating current of 0.5 A,current frequency of 2 000 Hz,duty ratio of 1∶2 and plating time of 2 h.The whole recovery of 66.0% for 238Pu of 4.23×10-3 Bq could be achieved with much less analysis time and 10%-15% higher recovery than the ordinary precedure.更多还原