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Abstract  

A rapid separation system based on SISAK technique was established to isolate 142La successfully from fission products. SISAK technique is often applied in the separation of nuclides with the half-life of seconds or minutes. Here it was used to separate the parent nuclide of 142La, which the half-life is in the magnitude of several seconds. According to the separation procedure designed in the paper, the activity of 142La acquired is more than 104 Bq and the decontamination factors for most γ-emitters are higher than 103.

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Journal of Radioanalytical and Nuclear Chemistry
Authors:
Ye Yu-xing
,
Hu Jin-xin
,
Huang Zi-lin
,
Shi Wei-qun
,
Wu Guang-min
,
Tang Hong-bin
,
Zhu Wen-bin
,
Wang Xiao-rong
,
Zhao Hu-gen
,
Dong Yu
,
Sheng Dong
,
Luo Fang-xiang
, and
Zhao Yan-ju

Abstract  

The partitioning of actinides from simulated high level liquid waste (HLLW) originated from the Purex process has been studied using a mixture of dihexyl N,N-diethylcarbamoylmethyl-phosphonate (DHDECMP) and tributylphosphonate (TBP) in kerosene (OK). The distribution ratios of actinides were investigated as a function of a number of parameters such as the concentration of nitric acid, salting-out reagent, Gd(III) in the aqueous phase, extractant in the organic phase, and temperature. The extraction complexes, extraction reaction constant k, and thermodynamic parameters H, G and S were determined. The extraction of actinides from simulated HLLW by DHDECMP-TBP/OK has been carried out using a miniature countercurrent centrifugal contactor. The results show that the removal efficiency of actinides is greater than 99.9%. A conceptual flowsheet for the removal of actinides from HLLW is proposed.

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