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2 results about "Neutron activation analysis" patented technology
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Neutron activation analysis (NAA) is the nuclear process used for determining the concentrations of elements in a vast amount of materials. NAA allows discrete sampling of elements as it disregards the chemical form of a sample, and focuses solely on its nucleus. The method is based on neutron activation and therefore requires a source of neutrons. The sample is bombarded with neutrons, causing the elements to form radioactive isotopes. The radioactive emissions and radioactive decay paths for each element are well known. Using this information, it is possible to study spectra of the emissions of the radioactive sample, and determine the concentrations of the elements within it. A particular advantage of this technique is that it does not destroy the sample, and thus has been used for analysis of works of art and historical artifacts. NAA can also be used to determine the activity of a radioactive sample.
A control system for a neutron activation analyzer
This invention relates to the field of automatic control design technology, and in particular to a control system for a neutron activation analyzer. The technical solution includes a control core module, an electrical isolation module, a power supply module, a communication module, an auxiliary protection module, a host computer module, and a database module. The electrical isolation module includes digital isolation units and analog isolation units. The digital isolation units are used to achieve electrical isolation and conversion between control signals and load signals based on a physical disconnect structure. This invention avoids the impact of voltage spikes and surge currents, protects the PLC module, and improves system stability. It integrates the PLC core control architecture, host computer, and database to achieve integrated management and control of peripheral devices and full-process acquisition, storage, and traceability of operational data. It is equipped with auxiliary protection and maintenance units to ensure safe equipment operation, while simplifying operation and deployment and adapting to on-site testing needs.
Owner:INST OF ENERGY HEFEI COMPREHENSIVE NAT SCI CENT (ANHUI ENERGY LAB)
A multi-element gamma-ray spectrum quantitative inversion algorithm based on polynomial forward and Newton iteration
The present application relates to the technical field of prompt gamma neutron activation analysis and non-destructive testing of industrial materials, and particularly relates to a multi-element gamma spectrum quantitative inversion algorithm based on polynomial forward and Newton iteration. The technical scheme comprises the following steps: obtaining a gamma spectrum obtained by neutron activation measurement, and extracting a plurality of gamma detection characteristic values corresponding to a plurality of elements; based on the plurality of gamma detection characteristic values and the true mass fraction of the corresponding sample elements, a polynomial forward model is established, and based on the gamma detection characteristic values and the true mass fraction of the elements, a direct polynomial inverse model is established. The present application effectively improves the accuracy of multi-element gamma spectrum quantitative inversion, enhances the robustness and convergence stability of the algorithm under complex materials, improves the generalization ability of the model to different matrix environments, and has good engineering practicability.
Owner:INST OF ENERGY HEFEI COMPREHENSIVE NAT SCI CENT (ANHUI ENERGY LAB) +1