Method for determining age of plutonium-containing particle

Abstract

The invention provides a method for determining the age of a plutonium-containing particle. The method comprising the following steps: 1) dissolving a plutonium-containing particle sample to obtain aplutonium-containing solution; 2) adding a diluent to the plutonium-containing solution, separating and purifying to obtain a plutonium component and an americium component; 3) measuring a parameter,and calculating the quality of 241Pu; 4) measuring a parameter, and calculating the quality of 241Am; 5) measuring an activity ratio; 6) calculating the age of the plutonium-containing particle by a formula. According to the invention, the method for determining the age of a plutonium-containing particle is established, the problems that the high-temperature-generated plutonium oxide particles aredifficult to be effectively dissolved, the measuring method relies on the same matrix standard sample, and the existing mass spectrometry cannot accurately determine the plutonium-containing particlesample with low 240Pu abundance, are solved, the adaptability of the method is improved, and the method can be applied to the age determination of various plutonium-containing particles.

Description

technical field [0001] The invention belongs to the field of nuclear safeguards, in particular to a method for measuring the age of plutonium-containing particles. Background technique [0002] The age of plutonium is an important parameter to infer the history and source information of plutonium materials. By verifying the age of plutonium-containing particles in swab samples, it can be effectively judged whether there are nuclear activities in violation of the contract. At present, there are mainly two methods for determining the age of plutonium-containing particles established by various research institutions in the world. Among them, the methods established by the International Atomic Energy Agency (IAEA) and the Japan Atomic Energy Agency (JAEA) use nitric acid or nitric acid / hydrofluoric acid to dissolve plutonium-containing particles. , for plutonium dioxide particles generated at high temperature, this method is difficult to effectively dissolve, and the identificat...

AI Technical Summary

Problems solved by technology

At present, there are mainly two methods for determining the age of plutonium-containing particles established by various research institutions in the world. Among them, the methods established by the International Atomic Energy Agency (IAEA) and the Japan Atomic Energy Agency (JAEA) use nitric acid or nitric acid / hydrofluoric acid to dissolve plutonium-containing particles. , for plutonium dioxide particles generated at high temperature, this method is difficult to effectively dissolve, and the recognition and transfer of plutonium-containing particles need to be completed in SEM, so the applicability of this method is greatly limited; German Institute of Transuranic Elements (ITU) The established method needs to use SIMS analysis, which can directly analyze the actual plutonium-containing particle samples, but it needs to rely on the standard sample of the same matrix to correct the relative sensitivity factor (RSF) of mass spectrometry, which also limits the applicability of the method; in addition, for 240 Plutonium-containing particulate samples with low Pu abundance, due to their 241 The abundance of Pu is very low, so the existing mass spectrometry cannot be accurately determined, which also limits the applicability of the method

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