Method for establishing dynamic desorption model of plutonium on mineral surface

Abstract

The invention discloses a method for establishing a dynamic desorption model of plutonium on a mineral surface, which comprises the following steps: carrying out dynamic desorption experiments of plutonium at different flow velocities, obtaining key parameters of the plutonium desorption experiments, deducing a kinetic reaction equation of the desorption of plutonium on the mineral surface, and establishing the dynamic desorption model of plutonium. The method can be suitable for the desorption behavior research of the nuclide plutonium on the surface of each rock mine in various scenes, the desorption amount of the nuclide at different flow velocities along with time change is obtained according to the desorption model, and a support is provided for the prediction of the desorption behavior of the plutonium in a large-scale time range.

Description

technical field [0001] The invention belongs to the field of nuclear environmental science, and relates to a method for establishing a desorption model of plutonium on a mineral surface, which can be applied to research and prediction in the fields of nuclide adsorption / desorption behaviors, such as groundwater environment systems and radioactive repositories. Background technique [0002] Radioactive waste is the main waste produced by people in the process of using nuclear energy. It has high radioactivity (accounting for more than 98% of the radioactivity in spent fuel reprocessing waste) and high specific activity (≥10 10 Bq / kg), long half-life ( 239 Pu-T 1 / 2 : 2.44×10 4 Years; 237Np-T 1 / 2 : 2.14×10 6 Years), high toxicity and other characteristics; if improperly disposed of, it will seriously endanger the living environment of human beings. This problem has attracted extensive attention especially in countries using nuclear energy, and a lot of human, material and f...

AI Technical Summary

Problems solved by technology

[0004] ①Lack of desorption model for reference

There are many domestic studies on the adsorption behavior of nuclides on mineral surfaces, but there are few studies on desorption behavior and almost no desorption mechanism and dynamic model derivation, which is very unfavorable for predicting the desorption amount and migration behavior of nuclides in groundwater environments

[0005] ② Lack of research data on plutonium desorption behavior

There are very few domestic studies on the desorption behavior of plutonium, and most of the adsorption/desorption studies use other nuclides to indirectly replace plutonium, such as Np, Eu, etc., but as we all know, the chemical behavior of plutonium is very complicated. The practice of nuclide

Images