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2 results about "Natural abundance" patented technology
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In physics, natural abundance (NA) refers to the abundance of isotopes of a chemical element as naturally found on a planet. The relative atomic mass (a weighted average, weighted by mole-fraction abundance figures) of these isotopes is the atomic weight listed for the element in the periodic table. The abundance of an isotope varies from planet to planet, and even from place to place on the Earth, but remains relatively constant in time (on a short-term scale).
Leakage detection method, device and equipment for environment-friendly gas insulated switchgear
The invention relates to a leakage detection method, device and equipment for environment-friendly gas insulated switchgear. The environment-friendly gas insulated switchgear GIS is filled with air containing isotopic tracer gas, the concentration of the isotopic tracer gas in the filled air is different from that of the isotopic tracer gas in the natural environment, and the method comprises the following steps: receiving an ultrasonic signal collected by an ultrasonic sensor installed in the environment where the environment-friendly GIS is located; acquiring a first abundance of an isotopic tracer gas in an environment where the environmental protection GIS is located under the condition that leakage of the environmental protection GIS is determined according to the ultrasonic signal; comparing the first abundance with the natural abundance to obtain a first comparison result; wherein the natural abundance is the abundance of the isotopic tracer gas in the natural environment; and determining a leakage detection result of the environmental protection GIS according to the first comparison result. By adopting the method, the leakage of the environment-friendly GIS can be detected in time, the operation reliability of the environment-friendly GIS is improved, and the space safety of the environment where the environment-friendly GIS is located is improved.
Owner:YUNNAN POWER GRID CO LTD +1
Mo-99 Irradiation Production and Energy Spectrum Optimization Method Based on Reactor Activation
A method for Mo-99 irradiation production and energy spectrum optimization based on reactor activation is proposed. This method establishes a three-dimensional high-fidelity neutronics and burnup coupling model of the reactor and irradiation channels. The full neutron energy range is divided into 238 energy regions, and perturbations are applied to the flux of each individual energy region. This yields the importance indicators and curves of Mo-99 production on flux changes in each energy region, thereby identifying positively and negatively important performance regions. For negatively important performance regions, filter nuclides are screened from the absorption cross-section characteristics of natural isotopes, and burnup calculations are performed at different doping levels to obtain production gains. The isotope scheme is then converted into a natural abundance material scheme to determine the optimal filter material and loading method. This invention, through integrated energy spectrum optimization—refined energy spectrum analysis, filter nuclide screening, determination of the optimal energy spectrum control scheme, and impurity assessment—can increase Mo-99 production without adding extra post-processing steps and reduce the risk of radioactive impurity introduction. It is applicable to the industrial and regional supply of Mo-99 for various reactor platforms, including commercial and research reactors.
Owner:SHANGHAI JIAOTONG UNIV