论文部分内容阅读
本文研究了以四苯硼钠-乙酸戊酯萃取无载体铯-137时,水相pH值、钠离子等浓度和有机相四苯硼钠浓度对萃取率的影响;在此基础上提出了一种自裂变产物中快速分离和测定铯-137的改进程序;萃取时有机相与水相的体积比选为3:1,分出的有机相直接进行测量。两份平行试样的放化分离可在三分钟内完成。对主要长寿命γ放射性裂片的去污因数≥10~5。本法的准确度和单次测定的相对标准偏差均在1%以内。所需萃取剂和分离时间仅为芬斯汤(Finston)建议的程序的十分之一。
In this paper, the effects of pH value, sodium ion concentration and sodium tetraphenylborate concentration on the extraction rate were investigated when the carrierless cesium-137 was extracted with sodium tetraphenylborate-amyl acetate. On the basis of this, An improved procedure for the rapid separation and determination of cesium-137 from self-fission products; the volume ratio of organic to aqueous phase at the time of extraction is selected to be 3: 1, and the organic phase separated is directly measured. Radiochemical separation of two parallel samples can be completed in three minutes. The decontamination factor of the main long-lived γ-radiated splinters is ≥10 ~ 5. The accuracy of this Law and the relative standard deviation of single determination are within 1%. The required extractant and isolation time is only one-tenth that recommended by Finston.