49 results about "Radionuclide contamination" patented technology

The embodiment of the invention discloses a method and device for treating radioactive wastes. The method comprises the following steps of: putting nonradioactive inorganic wastes into a furnace body of a radioactive waste treatment device to form a thermal plasma area above the inorganic wastes by electrode arcing, and heating the putted inorganic wastes to form a molten pool; starting a coolingdevice to cool down the furnace body to a temperature of 25-150 DEG C so as to make the inorganic wastes attached to the inner wall of the furnace body be solidified to form a shell; putting radioactive wastes into the furnace body to pyrolyze organic elements of the radioactive wastes, and then exhausting the generated gas from the furnace body; and charging inorganic elements of the radioactivewastes into the molten pool to be molten, and discharging the molten inorganic elements out of the furnace body. During the implementation of the method and device disclosed by the invention, the furnace body does not need refractory materials, and the molten body is solidified in an area near the inner wall of the furnace to form the shell, thus the inner wall of the furnace does not directly contact with the molten body, radioactive nuclides are prevented from polluting the inner wall of the furnace, the device can be used for treating various wastes, the service life of the device is long and the amount of residual wastes is small.

The present invention provides an orofacial radiation detection device for detection of radionuclide contamination from inhalation. The device includes a face mask including a support frame and an adjustable head strap connected to the support frame. Mounted on the frame are radiation detectors in selected locations so that when being worn by a person, the detectors are located in close proximity to the orofacial region of the person including their nose and mouth. The device includes an electronic controller connected to the detectors for controlling operation of the radiation detectors. The device includes a microcomputer mounted on the support frame and electrically connected to the electronic controller for processing signals from the detectors for allowing input from an operator, performing data analysis and detection algorithms, and outputting results. The detectors include beta and gamma detectors that, utilizing appropriate hardware processing and software algorithms, are able to determine if radionuclides are present in the orofacial area of a person suspected to have been exposed to airborne contamination.

A method for remediating aquifers and groundwater contaminated, for example by toxic halogenated organic compounds, certain inorganic compounds, and oxidized heavy metals and radionuclides, using the introduction of an innocuous oil, preferably an edible, food grade oil such as soybean oil, formulated into a microemulsion preferably by mixing with a natural food-grade emulsifier (such as lecithin) and water.

It is an object of the present invention to efficiently suppress radionuclide deposition on a reactor component of nuclear power plant. Radionuclide deposition on the surface of a metallic reactor component of nuclear power plant is suppressed by forming a ferrite film on the component, wherein the film is formed, after decontamination for removing radionuclides contaminants from the component surface is completed and before the plant is started up, by contacting a treatment solution which mixes a first agent containing the iron (II) ions, a second agent for oxidizing the iron (II) ions into the iron (III) ions and a third agent for adjusting pH level of a solution to 5.5 to 9.0 in this order with the reactor component surface.

The invention relates to the technical field of nuclear power decontamination, in particular to a textile surface adhesive staining nuclide detergent and a preparation method thereof. The textile surface adhesive staining nuclide detergent is prepared from, by weight, 12-18% of a composite surfactant, 15-20% of a complexing agent, 8-14% of an enzyme preparation, 5-8% of an enzyme stabilizer, a pHregulator and the balance water. The textile surface adhesive staining nuclide detergent can meet the requirement for decontamination of nuclear power textiles, especially has an excellent decontamination effect on radionuclide contamination, does contain harmful ingredients, and has environment friendliness, and after decontamination is completed, the textile surface adhesive staining nuclide detergent is non-destructive to fabrics, easy to rinse, and free of residues.

The invention relates to a preparation technology of radioactive excretion promotion medicines and particularly relates to a traditional Chinese medicine extract for irradiated body radionuclide excretion promotion and an extraction method of the traditional Chinese medicine extract. The method comprises the following steps: with platycladus orientalis and rosewood core materials of cupressaceae as extracting raw materials, extracting with weak alkali water or alcohol, and recovering an extraction solvent, wherein the extraction components comprise tropolone, resins and volatile essential oil. The traditional Chinese medicine extract can be used for complexing excretion promotion medicines and wound-cleaning medicines of personnel suffering from radionuclide contamination and also can be applied to a clean recovery complexing agent in a radioactive experiment site.

The invention relates to a radionuclide pollution decontamination agent and a preparation method and an application thereof. The decontaminant comprises the following components by mass percentage: 1.0%-20% of EDTA.Na2, 0.1%-0.4% of carboxymethyl chitosan, 0.05%-0.3% of sodium alginate, 0.5%-2.0% of lidocaine hydrochloride, and balance of pure water or phosphate buffer, wherein a pH value is 6.9-7.0. The preparation method comprises the following steps: EDTA-Na2, carboxymethyl chitosan, sodium alginate and lidocaine hydrochloride are accurately weighed according to the proportion, the EDTA-Na2is heated and dissolved under alkaline conditions, and then the carboxymethyl chitosan and sodium alginate are dissolved, and then the two are mixed and stirred uniformly, a lidocaine hydrochloride solution is added, the pH is adjusted to 6.7-6.9 with HCl, the material is dissolved while stirring, and metering a volume. The decontamination agent has a chelate adsorption function on a plurality ofradionuclides, has no toxic and side effects, and can be used as the low-toxic and high-efficiency radionuclide pollution decontamination agent.

The invention provides a curing process method for radioactive nuclide polluted sandy soil, which comprises the steps of thermite preparation and curing process. Aluminum powder, ferric oxide powder and auxiliaries 1 are weighed by mass ratio of 0.33-0.66:1.00-2.00:0.01-0.30 and sequentially placed in a blender mixer to be stirred for 30-60 minutes at the speed of 60-120 r/min under the normal temperature and the constant pressure till the mixing is even. The curing process comprises the steps of mixing, dumping and embedding, ignition and post-processing. The mixing step is that the sandy soil with grain size smaller than 1cm and with SiO2 as a main component, thermite, auxiliaries 2 and simulate radioactive nuclide are mixed by mass ratio of 1.0:1.6-3.0-0.01-0.35:0.01-0.20 and stirred for 90-120 minutes at the speed of 45-60 r/min under the normal temperature and the constant pressure till the mixing is even. The dumping and embedding step is that a mixture obtained in the mixing step are dumped and embedded in a steel container or a cement pool with a cover plate and a gas filtering device at the top, dry sand with the depth of 15-50cm is dumped and embedded around the mixture, and dry sand with the depth of 50-100cm is covered on the mixture and then covered by the cover. The ignition step is that an ignition device is installed at the upper portion or the lower portion of the mixture, is powered on to perform ignition and is powered off to measure resistance and confirm the igniting effect. The post-processing step is that a cured body is taken out or embedded on the spot when cools to the environmental temperature.

The invention discloses a preparation method of dictyophora-loaded vulcanized nano zero-valent iron. The method includes the following steps: (1) soaking dictyophora in ultrapure water, heating the obtained solution in a reaction kettle, washing until the solution is neutral, and grinding the dried solid into powder for later use; (2) mixing and dissolving FeSO4*7H2O, Na2S2O4 and the dictyophora material obtained in step (1) in water, and adding NaBH4 for reaction; and (3) performing solid-liquid separation, washing and drying on the product obtained in the step (2) by using a magnet to obtaina dictyophora-loaded vulcanized nano zero-valent iron material. The dictyophora-loaded vulcanized nano zero-valent iron prepared by the method can be used for efficiently removing radionuclide uranium in wastewater, and has the advantages of simple and convenient operation, good removal effect, high chemical stability, cleanness, no pollution, no toxic effect on the environment, and wide application prospect in the field of radionuclide pollution control.

The present invention relates to a method for removing cesium in a clay mineral using hydrogen peroxide. According to the present invention, cesium in a clay mineral is removed using hydrogen peroxide, which serves to induce interlayer expansion of the clay mineral to allow a cation to easily enter an interlayer of the clay mineral, and thus cesium desorption efficiency can be further improved. Also, the method according to the present invention can be efficiently used to restore soil in residential areas widely contaminated with a radionuclide when a major accident such as Fukushima nuclear accident occurs as well as various sites of atomic energy facilities contaminated with a radionuclide. Also, since radiation-contaminated soil is treated with only hydrogen peroxide and cations, secondary environmental pollution caused by wastes can be significantly reduce and the waste disposing cost can also be saved.

Providing a roaster that operates at temperatures in the range of 800° Celsius to 2000° Celsius with inert, optional oxidizing and reducing gases to treat graphite contaminated with radionuclides including tritium, carbon-14, and chlorine-36. The combination of temperatures and gases allow for the removal of most to substantially all the carbon-14 within the graphite while substantially limiting gasifying the bulk graphite.

The invention belongs to the field of radioactive waste treatment, and relates to a method for reducing the glass solidification melting temperature of sandy soil polluted by radionuclides. Accordingto the method, raw materials are composed of 40-80 parts of sandy soil, 10-20 parts of boron oxide, 0-10 parts of sodium phosphate and 0-50 parts of waste glass powder. The method comprises the stepsof first putting 50-80 parts of sandy soil into a high-temperature-resistant crucible, and then laying 10-20 parts of boron oxide (or converted into boric acid containing a same mass ratio of boron oxide), 0-10 parts of sodium phosphate And 0-50 parts of waste glass powder sequentially on the surface layer of the sandy soil from bottom to top; putting the crucible into a high-temperature smeltingfurnace or other heating devices, conducting heating to 1400 DEG C, and keeping the temperature for 3-6 hours, and conducting cooling to obtain a uniform glass solidified body. According to the method, the melting temperature of sandy soil radioactive waste glass solidification is reduced, the melting time is shortened, the step of easily generating secondary pollution is avoided, the cost is reduced by utilizing waste glass powder, the capacity of waste is improved, and the glass solidified body with uniform physical and chemical properties is obtained.

The invention relates to the field of ocean radionuclide contamination management and enrichment and detection and in particular relates to a preparation method of serial protonated titanate nanotubeswith different H<+>/Na<+> ratios and application of the protonated titanate nanotubes to rapid and efficient adsorption to remove low-concentration nuclide uranium and cesium ions in seawater. The titanate nanotubes are prepared by adopting a hydrothermal method and the content of H<+> in the titanate nanotubes is increased through protonated modification; the porosity and specific surface area of a material are increased; and the adsorption and removal capability of the titanate nanotubes on the low-concentration nuclide ions in the seawater is greatly improved. By adopting the preparation method provided by the invention, the application range of a titanate nanotube series material is expanded and technical supports are provided for adsorption and removal and rapid enrichment and detection of uranium and cesium nuclides in the seawater with a low radioactive level.

The invention discloses an on-line measurement method for radionuclides in drinking water. The method comprises three parts of water sample collection, radioactivity measurement and data processing. The water sample collecting part can be used for continuously collecting drinking water into the measuring chamber; the radioactive measurement part can rapidly and accurately measure alpha, beta and gamma radionuclide pollutants in drinking water; and the data processing part is used for processing the obtained nuclear signals in real time, selecting interested signal amplitude spectrums for analysis, and automatically giving an alarm when the counting rate of the signals exceeds a threshold value or the counting rate exceeds a certain degree along with time change. The online measurement method solves the problems that a conventional monitoring method of a water system cannot detect short-term pollution, cannot continuously monitor radioactive pollution of the water system and cannot directly judge whether drinking water is polluted or not. The invention further provides a device for measuring the radioactivity in the drinking water on line.

The invention relates to a novel method for evaluating the potential of soil contaminated by phytoremediation radionuclide. The phytoremediation coefficient is defined as the product of the above-ground biomass of plants and the concentration of the radionuclide divided by the concentration of the radionuclide in soil; the potential of soil contaminated by the phytoremediation radionuclide is evaluated by the phytoremediation coefficient. The method comprehensively considers the three factors including the above-ground biomass of plants, the concentration of above-ground radionuclide of plants and the concentration of radionuclide in the contaminated soil, and is reasonable in evaluating the potential of the soil contaminated by phytoremediation radionuclide. Compared with the existing evaluation method, the novel method has the advantages of simplicity, intuition and reasonable result.

The present invention relates to a process for treating an earth contaminated by at least one radionuclide such as cesium ¹³⁷Cs comprising at least one step of separating said radionuclide by dispersed air flotation foam produced by blowing air bubbles in a suspension comprising said earth and at least one collector. The present invention also relates to the flotation foam obtained by implementing such a process.

The invention discloses a starch-base material capable of achieving fertilizer slow release and enriching radionuclide and a preparation method of the material. The method comprises the steps of weighing, by weight 1-99 parts of starch, 1-99 parts of a fertilizer, 0-50 parts of plasticizer and 0-50 parts of fortifier and mixing and stirring for 5-20 min to obtain a mixed material; and adding the mixed material into a twin screw extruder, conducting melt blending for 5-10min under the condition that the temperature is 80-180 DEG C and the pressure is 0.1-1 MPa, extruding, molding, and pelleting after cooling to obtain the starch-base material capable of achieving fertilizer slow release and enriching radionuclide. According to the starch-base material, good mechanical performances are achieved, the slow release speed can be controlled, when the fertilizer is subjected to slow release, the radionuclide can be enriched, and the material can be widely applied to fertilizer slow release and purification of heavy metal in water and organisms which are polluted by the radionuclide.

The present invention relates to a new technical proposal for testing, diagnosing, and studying the biology and the medicine. The present invention is characterized in that the cell protein extract combines into compound earlier than the corresponding antibody molecule, and combines with the null probe into a triple compound of the antibody-albumen-null probe, which can be moved into the non-metamorphic polyacrylamide gel for electrophoresis, and finally an ECL method is used for the irradiance test in darkroom. Compared with the traditional method, the technology has simple and reliable operation without radionuclide element pollution.

The invention discloses a radionuclide decontaminant, and a preparation method and application thereof. The decontaminant comprises, by mass, 8-12% of a surfactant, 2-5% of compound enzyme, 16-20% of a nuclide removing agent, 8-14% of a chelating agent and water. The preparation method comprises the following steps: preparing the required components according to the weight percentage; adding water into the container; sequentially adding the chelating agent, the nuclide removing agent, the surfactant and the compound enzyme into the container under stirring; and adding a proper amount of the pH regulator into the container, and fully and uniformly mixing to obtain the decontaminant. The application means that the decontaminant is used for removing radionuclides on the surface of a lifting belt or a safety belt for a nuclear power plant. The decontaminant has an excellent cleaning effect on dust and greasy dirt on the surfaces of the lifting belt and the safety belt, especially has an excellent removal effect on radionuclide contamination, and meanwhile, the detergent does not contain corrosive components, is environment-friendly and does not cause damage to fiber materials.