Energy Spectrum Dose Calibration for Stable Multi-Region Radiation Monitoring
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Solution Overview
Problem
Existing energy spectrum-dose measuring methods in radiation monitoring face issues such as poor energy response, complex calculation processes, and lack of universality in diverse environments, particularly due to the use of methods like G(E) function, BECK, stripping, and total counting rate methods, which suffer from unstable solutions and non-convergence.
Innovation Solution
An energy spectrum-dose measuring method involving energy calibration with a standard radiation source, dividing the energy spectrum into regions based on ray peaks, and using a convolution-free full-spectrum conversion to calculate energy spectrum-dose conversion coefficients, improving energy response and reducing calculation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the G(E) function method with least square and conjugate gradient methods is used to solve conversion coefficient, then the energy spectrum-dose conversion can be achieved, but the solution process becomes complex and the results are unstable with non-convergence
Solution Approach 1:
The patent segments the energy spectrum into multiple discrete energy channels, and for each channel, independently calculates the conversion coefficient from counting rate to dose rate. This avoids the complex global optimization of the G(E) function while achieving accurate energy-dependent dose conversion through channel-by-channel calculation.
Solution Approach 2:
Instead of solving for the conversion coefficient G(E) through complex deconvolution and optimization methods, the patent inverts the approach by directly measuring the counting rate in each energy channel and calculating the corresponding dose rate using pre-determined conversion factors, thereby simplifying the solution process while maintaining accuracy.
2Measurement precision
If the stripping method is used to convert energy spectrum into fluence spectrum by convolution, then the dose rate can be solved, but the calculation process becomes time-consuming and inefficient
Solution Approach 1:
The patent divides the continuous energy spectrum into discrete energy channels, and for each channel, directly calculates the dose rate without performing time-consuming convolution operations. This segmentation approach transforms the complex integral convolution problem into simple summation of discrete channel contributions, dramatically improving calculation efficiency.
Solution Approach 2:
The patent replaces the mechanical convolution operation with a simpler direct calculation method. Instead of performing iterative convolution to transform energy spectrum to fluence spectrum, the method directly computes dose rate from counting rate using pre-calibrated conversion factors for each energy channel, eliminating the computationally intensive convolution step.
3Ease of operation
If the total counting rate method is used to convert dose rate through absorbed dose rate of air, then the calculation is simple, but it is not suitable for complex environments
Solution Approach 1:
The patent segments the total counting rate into energy-channel-specific counting rates, allowing the simple calculation approach to be extended to complex environments. By maintaining the simplicity of direct multiplication while incorporating energy-channel resolution, the method achieves both ease of operation and adaptability to complex radiation fields with multiple energy components.
Solution Approach 2:
The patent adds the energy channel dimension to the simple total counting rate method. Instead of using a single total counting rate value, the method introduces energy-channel-resolved counting rates, transforming the one-dimensional total rate calculation into a multi-dimensional energy-resolved calculation that can handle complex environmental conditions while maintaining computational simplicity.
4Measurement precision
If the BECK method is used to perform calculation by characteristic γ spectral line, then the dose rate can be calculated, but high spectral resolution is required and it is difficult to use in complex environment
Solution Approach 1:
The patent creates a universal dose rate calculation method that works across different environments and radiation sources. By using energy-channel-resolved counting rates and corresponding conversion factors, the method achieves the accuracy of characteristic line methods while being applicable to any radiation field composition, including complex environments with multiple nuclides and energy distributions.
Solution Approach 2:
The patent segments the radiation field into energy channels, allowing dose rate calculation without requiring identification of specific characteristic gamma lines. This segmentation approach enables the method to handle complex environments with multiple radiation sources and energy components, unlike the BECK method that relies on identifying specific nuclide characteristic lines.
Data Source
AI summary
An energy spectrum-dose measuring method and device is provided. The method includes: performing energy calibration on a spectrometer using a standard radiation source to obtain a conversion relation between a channel and an energy, where the conversion relation is represented by a calibration factor; measuring ray peaks of n radiation sources with different energies, and dividing energy of an obtained energy spectrum into n regions; performing spectrum collection on the n radiation sources according to the n regions to obtain n net energy spectra subjected to the energy calibration through the calibration factor; performing dose measurement on the n radiation sources sequentially to obtain n dose rates corresponding to the n net energy spectra; calculating a relationship between counting rates of the radiation sources in the n regions and corresponding dose rates; and calculating a full-spectrum dose rate according to a current dose rate of each region.