Segmented Gamma Scanning Source Characterization via Precomputed Lookup Tables
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing non-destructive quantitative detection technologies for radioactive nuclear waste face high computational costs and systematic deviations in measurement accuracy, particularly for medium to high density objects, due to inefficiencies in transmission reconstruction distortion correction and limited applicability of segmented γ scanning measurement systems.
Innovation Solution
A method is developed to characterize the property characteristics of a transmission source in a segmented γ scanning measurement system by manufacturing standard transmission objects, simulating and calculating a transmission measurement process, fitting corresponding relationships, and using these to determine the original reconstruction density and space angle cosine, thereby improving transmission reconstruction distortion correction and measurement efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If iterative algorithms are used to correct transmission reconstruction distortion, then measurement accuracy is improved, but computational cost increases and measurement efficiency decreases
Solution Approach 1:
The patent pre-calculates and stores correction factors for different transmission thicknesses, densities, and energy levels in a lookup table before actual measurements. During measurement, the system directly queries the pre-computed table rather than performing iterative calculations, thus achieving high correction accuracy while maintaining fast measurement speed.
Solution Approach 2:
The patent creates a simplified mathematical model that copies the essential characteristics of the complex iterative reconstruction process into pre-computed correction curves. These curves represent the relationship between transmission parameters and reconstruction distortion, allowing rapid correction without repeating the full iterative algorithm.
2Measurement precision
If segmented γ scanning measurement is used for medium and low density objects, then measurement accuracy is maintained, but the system cannot accurately measure high density objects due to expanding systematic deviation
Solution Approach 1:
The patent introduces energy as a key parameter in the correction model, establishing correction relationships for different γ ray energies. By measuring transmission at multiple energy levels and applying energy-dependent correction factors, the system compensates for the increased systematic deviation in high density objects, extending its accurate measurement capability to higher density materials.
Solution Approach 2:
The patent adds the energy dimension to the traditional transmission-thickness-density correction model. Instead of using single-energy transmission measurements, the system performs multi-energy measurements and uses the energy spectrum information to correct reconstruction distortion, thereby expanding the applicable density range.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy and efficiency of transmission reconstruction distortion correction, expands the system's applicability to medium and high density samples, and reduces systematic deviations, improving the overall performance of the segmented γ scanning measurement system.
Implementation Method 1
γ rays with different energies that pass through a sample to be measured may be attenuated to different degrees before reaching a detector
Data Source
AI summary
A method including: manufacturing a standard transmission object; simulating a transmission measurement process using simulation calculation method, to establish a database with respect to a transmission thickness, an equivalent water density, an original reconstruction density of the standard transmission object, a space angle cosine of the transmission source and an energy of a γ ray, fitting a corresponding relationship of the space angle cosine of the transmission source with respect to parameters of the standard transmission object and the energy of the γ ray based on the database; selecting a corresponding standard transmission object for transmission measurement for a transmission source to be characterized, to obtain an original reconstruction density of the standard transmission object; reading the space angle cosine of the transmission source to be characterized from the database according to fitted corresponding relationship of known parameters of the standard transmission object and the energy of the γ ray.