9 results about "Radionuclide contamination" patented technology

Methods for processing metal components from the nuclear industry are described. In some embodiments, a method includes processing a component having a surface contaminated with radionuclides by dissolving at least a portion of the surface with an acid solution to produce a waste solution including the radionuclides, and separating the radionuclides from the waste solution. In some embodiments, a method includes processing a component including a target radionuclide by immersing at least a portion of the component in an electrolyte bath, applying an electric current to cause electrodissolution, and electroplating the target radionuclide from the solution onto a cathode. In some embodiments, a method includes processing a metal composite component by dissolving it to produce a solution including dissolved metal and particulate material, and separating the particulate material.

The present application relates to the technical field of product quality and safety, in particular to a high-throughput rapid screening method for radioactive substances in waste textile raw materials, comprising the following steps: step one, raw material preselection; step two, raw material pretreatment; step three, radioactive substance detection; step four, radioactive substance measurement and analysis; step five, detection of Sr-90 content in raw materials; and step six, reagent addition. The present application proposes a research on common gamma nuclides and Sr-90 content analysis in textile raw materials, ensures the radioactivity safety of textile raw materials, establishes a method for detecting radioactive substance Sr-90 in waste textile raw material solid waste by using a low-background alpha beta measuring instrument, the average recovery rate of the method is 80%, the average detection limit, and the radioactive detection of waste textile raw materials is studied. The research results show that the content of gamma radioactive nuclides in the selected waste textile raw material samples meets the national limit standard requirements, and reduces the pollution of common radioactive nuclides.

The invention discloses an organic diphosphate ligand and a preparation method and application thereof, the structural formula of the ligand is shown in the specification, and the preparation method comprises the following steps: dissolving tetraethyl methylene diphosphate in an organic solvent, adding a catalyst and ethyl bromoacetate, and reacting to obtain an ethyl diphosphate intermediate; and reacting the diphosphate ethyl ester intermediate with acid to obtain the organic diphosphate ligand. The organic diphosphate ligand can efficiently chelate nuclide ions, can be used for removing nuclides contaminated on the body surface and can also promote discharge of nuclides in the body.

A method for recovering metal from a nuclear industry component is described. In some embodiments, the method includes removing a metal contaminated with a radionuclide from a metal component, obtaining a contaminated solution containing the radionuclide, and separating the radionuclide from the contaminated solution. The metal removal may be performed mechanically, chemically, and / or electrochemically. The radionuclides may be separated using techniques such as ion exchange, solvent extraction, precipitation, co-precipitation, and / or electrochemical deposition. The waste material generated during the recovery process can be reused in a subsequent recovery step. The method allows for the recovery of valuable metals from nuclear industry components while minimizing radioactive waste and allowing for beneficial reuse of recovered radionuclides.

The present invention discloses a water-based chloroprene rubber-based two-component strippable detergent, a preparation method, and its application. The agent utilizes an anionic chloroprene rubber composite emulsion as component A and a cationic chloroprene rubber composite emulsion as component B, and promotes the formation of a water-based, rapidly curing, strippable decontamination film by inducing demulsification. Due to the wide operating temperature range and excellent mechanical properties of chloroprene rubber, and the fast curing speed and low film-forming temperature of polyurethane, the two polymer materials are combined to overcome some of the inherent performance shortcomings of the materials. The two-component strippable detergent can achieve film formation within 60 seconds and complete curing within 2 hours, and is less affected by ambient temperature and humidity. This improves the long film-forming and curing time of single-component detergents. Furthermore, the formed film exhibits excellent mechanical properties and strong adhesion to contaminated surfaces, and can complex radioactive nuclide contamination, achieving the purpose of removing radioactive nuclides, with a decontamination rate exceeding 90%.

The present invention discloses the preparation and application of a tannin-coupled cottonseed protein composite material for uranium removal, comprising: adding cottonseed protein to distilled water under a nitrogen atmosphere, stirring, then adding a hydrogen peroxide solution and ascorbic acid, stirring, to obtain a cottonseed protein mixed solution; adding plant tannin to the cottonseed protein mixed solution to adjust the concentration of the plant tannin in the mixed solution to 0.3 to 1.1 mmol / L, stirring for reaction, dialyzing to remove unreacted plant tannin, and freeze-drying to obtain a tannin-coupled cottonseed protein composite material. The present invention prepares the tannin-coupled cottonseed protein composite material through a free radical-mediated covalent interaction between tannin and cottonseed protein. The tannin-coupled cottonseed protein composite material has the characteristics of a simple preparation method, easy biodegradation, and environmental friendliness. It can achieve rapid and effective separation of uranyl in water environments and on different solid surfaces, and has good application prospects in the safe and efficient treatment of radionuclide contamination in water environments and on solid surfaces.

This invention relates to a method for assessing the risk of external exposure pathways to radionuclide-contaminated sites, comprising the steps of: establishing a dose evaluation model; statistically analyzing relevant parameters of the environmental transfer coefficient of the external exposure pathway; establishing a probability distribution function for the relevant parameters of the environmental transfer coefficient of the external exposure pathway; and forming a dose risk assessment model for the external exposure pathway. This invention also provides a system for assessing the risk of external exposure pathways to radionuclide-contaminated sites. By employing the method and system for assessing the risk of external exposure pathways to radionuclide-contaminated sites, the probability distribution of the environmental transfer coefficient of the external exposure pathway can be obtained by studying the probability distribution of the model input parameters, ultimately establishing a probability-based risk assessment model for radionuclide-contaminated sites.

The present invention relates to a method for decontaminating soil contaminated with radionuclides, and more specifically, to a high-efficiency method for decontaminating soil contaminated with radionuclides that can significantly improve the removal efficiency of cesium by preventing the re-adsorption of cesium within clay minerals of soil contaminated with radionuclides leaked from nuclear-related facilities, while simultaneously simplifying the decontamination process to improve process time and economic efficiency.

The present application relates to a kind of radionuclide contaminated site inhalation pathway probability risk assessment method.The radionuclide contaminated site inhalation pathway probability risk assessment method provided by the present application, by investigating the method model of foreign radioactive contaminated site risk assessment, after comparative analysis, select to use the wide range, maturity high deterministic mode, then select the inhalation pathway of greater influence, study air / soil concentration ratio, area correction coefficient, covering and depth correction coefficient, residence coefficient and air annual intake amount etc.The probability density distribution function of the related parameters of the environmental transfer coefficient of inhalation pathway is obtained, and the probability distribution function of the environmental transfer coefficient of inhalation pathway is obtained, and the dose value based on probability distribution of inhalation pathway is obtained, and by comparing with the dose specified in the relevant standard, the risk assessment conclusion of the inhalation pathway of radioactive contaminated site is obtained, and the foundation for public dose assessment is laid.