9 results about "Radioactive decay" patented technology

The invention relates to a method for separating heavy metal cations and radionuclides from aqueous solutions. The method according to the invention can be used to separate dissolved and / or suspended naturally occurring ions or radioactive ions produced by radioactive decay, nuclear transformation reactions such as nuclear fission, or, for example, by activation with neutron radiation, from aqueous solutions.

The invention relates to the technical field of science popularization demonstration, in particular to a half-life period demonstration device and a half-life period demonstration method. The device comprises a base body, a plurality of vertically-arranged demonstration cavities are formed in the table top of the base body, magnetic jumping blocks are arranged in the demonstration cavities, the visual states of the top faces and the bottom faces of the magnetic jumping blocks are different, and the magnetic pole directions of the top faces and the bottom faces of the magnetic jumping blocks are opposite; an electromagnet is arranged under each magnetic jumping block, all the electromagnets can be controlled by a controller to switch the magnetic pole direction, and when the controller controls part of the electromagnets to switch the magnetic pole direction, the part of the electromagnets and the bottom faces of the magnetic jumping blocks are magnetically repelled to drive the magnetic jumping blocks to jump and turn over. Therefore, radioactive decay of part of atomic nucleuses in the elements is demonstrated. According to the invention, by combining the action of a mechanical structure, the nuclear decay process and rule can be dynamically and visually displayed, so that the double problems of non-visual teaching and weak science popularization display can be solved.

The application belongs to the technical field of radiation protection, and particularly relates to a method and device for obtaining radioactive aerosol data in a closed space. The method comprises the following steps: obtaining a pre-established aerosol diffusion model and an aerosol deposition model; the aerosol diffusion model and the aerosol deposition model are obtained according to the properties of radioactive aerosol and the environmental parameters and ventilation system parameters of the closed space, and the radioactive decay, physical deposition and chemical deposition factors of the radioactive aerosol are considered; and the space radioactive aerosol concentration and the ground radioactive aerosol concentration in the closed space are obtained according to the aerosol diffusion model, the aerosol deposition model, the parameters of the closed space and the properties of the radioactive aerosol. The method solves the problem of dependence of radioactive aerosol on sampling measurement, and provides data for on-site radiation protection.

A method for ranking the hazard of radionuclides, which ranks the hazard of radionuclides by calculating the total effective dose produced by different radionuclides within a certain geographical range in the spread of radioactive contamination, and then screens and controls the types and quantities of radionuclides; wherein the calculation of the effective dose comprehensively considers the influence of radioactive decay, radionuclide deposition, air immersion external exposure, ground deposition external exposure, inhalation internal exposure and other factors. The method can realize the rapid ranking of radionuclides, and achieves a good balance between calculation efficiency and accuracy.

The application provides a pollution diffusion simulation method and device fusing dry and wet deposition and radioactive decay, and relates to the technical field of pollution diffusion simulation. The application provides a pollution diffusion simulation method and device fusing dry and wet deposition and radioactive decay, and relates to the technical field of pollution diffusion simulation. The application provides a pollution diffusion simulation method and device fusing dry and wet deposition and radioactive decay, and relates to the technical field of pollution diffusion simulation. The application provides a pollution diffusion simulation method and device fusing dry and wet deposition and radioactive decay, and relates to the technical field of pollution diffusion simulation. The application provides a pollution diffusion simulation method and device fusing dry and wet deposition and radioactive decay, and relates to the technical field of pollution diffusion simulation. The application provides a pollution diffusion simulation method and device fusing dry and wet deposition and radioactive decay, and relates to the technical field of pollution diffusion simulation.

The invention relates to radiation detection and analysis devices, in particular, to portable alpha particle sensors adapted for the identification and quantification of radioactive decay products - alpha particles. The proposed low-intensity alpha particle detection device ionization chamber with an electric current pulse amplifier contains an electrode placed in the ionization chamber with zero potential and a protective ring placed around the electrode. The electric current pulse amplifier is placed inside the ionization chamber with the possibility of being electrically connected to a power source, as well as with the possibility of being electrically connected to a processor for supplying an amplified electric current pulse to the processor. This design allows avoiding interference caused by an external electric field without additional shielding of the amplifier.

The application discloses an ecological environment pollution risk assessment method and system, comprising the following steps: collecting radioactive monitoring data of a target area and performing pretreatment; constructing a radioactive pollution space-time distribution observation field of the target area and generating a pollution observation field matrix; coupling a nuclide decay process with a diffusion migration process to form a radioactive decay-diffusion coupling evolution model; constructing a pollution digital twin evolution field, simulating and calculating the pollution diffusion state of the target area under a continuous time sequence; constructing a pollution source assumption set and forming a pollution source parameter vector set; iteratively updating and optimizing the pollution source parameter vector set; calculating the radioactive risk value of each spatial unit of the target area, dividing the risk level, and generating an ecological environment pollution risk assessment result. The application realizes radioactive pollution risk assessment by using the decay diffusion coupling and digital twin inversion method, and has the advantages of high accuracy and strong space-time characterization.

This invention relates to a device and method for providing a radiotherapy source that, in addition to supplying alpha rays, also supplies beta rays at a significant level through diffuse alpha radiation therapy (DaRT) in radiotherapy using an implantable radioactive source. [Solution] An interstitial radiation source (21) comprising a base (22) suitable for implantation in a tumor and alpha-emitting atoms (26) attached to the base (22) having a concentration of at least 6 μCi per centimeter length. The alpha-emitting atoms (26) attach to the base with a radioactive decay desorption probability of 30% or less.