Method for determining contents of uranium, neptunium and plutonium in PUREX posttreatment flow 1AW by liquid chromatography-mass spectrometry

Abstract

The invention belongs to the technical field of radioactive substance analysis, and relates to a method for determining the contents of uranium, neptunium and plutonium in PUREX posttreatment flow 1AWby liquid chromatography-mass spectrometry. The method comprises the following steps: (1) dilution and valence adjustment: diluting a 1AW solution with a diluent, and adding an oxidant to adjust thevalence of the plutonium; (2) determination of the uranium and the neptunium: performing chromatography separation and mass spectrometry detection on a diluted valence-adjusted solution of the 1AW, and drawing a working curve by an external standard method for quantification of the uranium and the neptunium; (3) determination of the plutonium: preparing two parts of 1AW diluted valence-adjusted solution, adding a 242Pu diluent into one part, performing chromatography separation and mass spectrometry detection in sequence, and calculating the content of the plutonium according to determinationresults of the abundance of two parts of solution 239Pu and 242Pu. Through adoption of the method disclosed by the invention, the contents of the uranium, the neptunium and the plutonium in a nuclearfuel PUREX posttreatment flow 1AW can be analyzed more accurately and precisely, and the influence of radioactivity on the analysis operation is eliminated.

Description

Technical field [0001] The invention belongs to the technical field of radioactive material analysis, and relates to a method for determining the content of uranium, neptunium, and plutonium in the PUREX post-processing flow 1AW by liquid-mass spectrometry. Background technique [0002] The 1AW solution is the aqueous waste liquid of the first separation unit (co-decontamination unit) in the first cycle of the nuclear fuel PUREX post-treatment process. In the process control analysis of the nuclear fuel reprocessing plant, in order to understand the trend of neptunium in the reprocessing process, the recovery rate of uranium and plutonium and the decontamination situation, it is necessary to accurately determine the content of uranium, neptunium, and plutonium in the 1AW solution, and the uranium in the 1AW solution The determination of neptunium, plutonium is an important indicator of radioactive material balance. [0003] The composition of 1AW solution is extremely complex, con...

AI Technical Summary

Problems solved by technology

[0007] Inductively coupled plasma mass spectrometry has high sensitivity and precision, and can simultaneously measure multiple elements. Therefore, ICP-MS cannot realize the simultaneous analysis of uranium, neptunium and plutonium, and they need to be separated in advance before they can be determined separately

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