4 results about "Neutron activation analysis" patented technology

The utility model relates to the technical field of radiation detection, in particular to a shielding structure and a neutron activation analyser, the shielding structure comprises an outer shell and a partition plate, a hollow cavity is formed in the outer shell, the partition plate is arranged in the hollow cavity to divide the hollow cavity into two shielding cavities arranged along the length direction of the outer shell, and the shielding cavities are arranged in the outer shell. Each shielding cavity is filled with the shielding filler, the hollow cavity is divided into the two independent small shielding cavities through the partition plate, and by means of the arrangement, when the shielding structure is subjected to external physical interference, offset of the shielding filler is limited in each independent shielding cavity through the physical blocking effect of the partition plate; and the filler void ratio of the shielding filler of each shielding cavity only slightly fluctuates without obvious difference, so that the shielding effectiveness of the shielding structure is improved.

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.

This invention relates to the field of transient gamma neutron activation analysis and non-destructive testing technology for industrial materials, and particularly to a multi-element gamma spectral quantitative inversion algorithm based on polynomial forward modeling and Newton's iteration. The technical solution includes the following steps: acquiring the gamma spectrum obtained from neutron activation measurement, extracting gamma detection feature values ​​corresponding one-to-one with each element; establishing a primary polynomial forward model based on the primary gamma detection feature values ​​and the true mass fraction of the corresponding element; and establishing a primary direct polynomial inverse model based on the gamma detection feature values ​​and the true mass fraction of the element. This invention effectively improves the accuracy of multi-element gamma spectral quantitative inversion, enhances the robustness and convergence stability of the algorithm under complex materials, improves the model's generalization ability to different matrix environments, and possesses good engineering practicality.

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.