PUREX流程还原性介质中99Tc的测量

提出了一种从PUREX流程还原性介质(以1BP料液为例)中分析测量99Tc的方法,分析过程包括钚的萃取分离、锝的氧化、定量萃取及液闪法测量。首先将样品中钚调为+4价,用1-苯基-3-甲基-4-苯甲酰基吡唑酮-5(PMBP)将钚快速萃取分离;然后用重铬酸钾在50℃条件下将锝氧化为+7价,并将样品调为碱性后,用2,4,6-三甲基吡啶在碱性介质中定量萃取,用液闪法进行有机相中Tc浓度的测量。采用该方法,可在20min内完成PUREX流程还原介质中锝的分析,相对标准偏差为0.6%(n=3)。

Measurment for99Tc in Reducing Medium of PUREX Process

This paper presents a method for measuring⁹⁹Tc from reductive medium in PUREX process. Taking 1BP as an example, the measurement process includes removal of plutonium, oxidation of technetium, extraction of technetium, and liquid scintillation measurement. The plutonium in the sample is first adjusted to valence of +4, and extracted with 1-phenyl-3-methyl-4-benzoylpyrazolone-5(PMBP). Then, the technetium is oxidized to +7 valence with potassium dichromate at 50 ℃. After that, the sample is added to potassium carbonate solution, and then technetium is quantitatively extracted with 2,4,6-trimethylpyridine in the alkaline medium, and measured by liquid scintillation method. With this method, technetium from reductive medium of PUREX process can be analyzed within 20 minutes, and the relative standard deviation is 0.6%(n=3).