Real-Time Photon Source Mapping via Computational Discrimination
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Solution Overview
Problem
Current methods for locating radiation sources using ionizing radiation detectors are inefficient and imprecise, requiring extensive measurements over entire sites and lacking real-time data processing, with existing collimation techniques leading to information loss and reduced precision due to the detection of photons from non-relevant angles.
Innovation Solution
A method and system for real-time mapping of photon source distribution using a mobile detection system with a non-collimated gamma ray detector, incorporating a calculation unit to determine the probability of photon origin based on energy and geometric detection efficiency, and correlating data across multiple measurement points to create a cartographic representation of source likelihood.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If systematic measurements are carried out over the entire site, then complete coverage of the measurement area is achieved, but the measurement time becomes excessively long and efficiency is reduced
Solution Approach 1:
The measurement process is segmented into two distinct phases: a rapid initial survey phase that covers the entire site to identify zones of interest, followed by a focused detailed measurement phase only in those identified zones. This segmentation allows complete area coverage without requiring exhaustive systematic measurements everywhere, thereby reducing total measurement time while maintaining measurement completeness.
Solution Approach 2:
A preliminary rapid survey is performed before detailed measurements to pre-identify zones containing photon sources. This preliminary action allows the measurement strategy to be adapted in real-time, directing detailed measurements only to relevant areas and avoiding wasteful measurements in source-free zones, thus significantly reducing overall measurement time.
2Productivity
If measurements are concentrated only on zones of interest, then measurement efficiency is improved, but the precision of source localization is reduced due to insufficient data points
Solution Approach 1:
The system implements real-time feedback by continuously analyzing measurement data as it is collected and dynamically updating the identification of zones of interest. This feedback mechanism allows the measurement strategy to adapt during the survey, ensuring that sufficient data points are collected in source zones to maintain localization precision while avoiding unnecessary measurements elsewhere, thus balancing efficiency and precision.
Solution Approach 2:
The measurement strategy is made dynamic rather than static. The identification of zones of interest is not fixed beforehand but evolves in real-time based on accumulated measurement data. This dynamic approach allows the system to concentrate measurements on source zones as they are identified, ensuring sufficient data collection for precision while maintaining high overall efficiency by adapting to actual site conditions.
3Measurement precision
If a shielded cage is used to collimate the detector, then measurement precision is improved by preventing detection of photons from irrelevant zones, but information loss occurs due to exclusion of valid photons from the source
Solution Approach 1:
The detector system segments the photon detection field into relevant and irrelevant directional components without physical collimation. By using computational methods to analyze photon energy spectra and angular distributions, the system can identify and analyze only photons originating from the zone of interest while excluding photons from irrelevant directions, achieving precision without the information loss associated with physical collimation cages.
Solution Approach 2:
The patent replaces the mechanical collimation system (shielded cage) with a computational analysis system. Instead of physically blocking photons with a cage, the system uses software algorithms to analyze detected photon characteristics (energy, angular distribution) and identify their origin zones. This substitution eliminates the information loss caused by physical collimation while maintaining or improving precision through more sophisticated data analysis.
4Measurement precision
If a shielded cage is used for collimation, then photons from adjacent zones are excluded, but the detection of photons from the target zone is also reduced
Solution Approach 1:
The patent replaces mechanical collimation with computational discrimination methods. The detector collects photons from all directions without physical restrictions, then uses software analysis of photon energy spectra and angular distribution patterns to identify and analyze only those photons originating from the target zone. This approach maintains high spatial resolution by accurately distinguishing photon origins while preserving the maximum possible photon quantity for analysis.
Solution Approach 2:
The system changes the approach from spatial filtering (physical collimation) to parameter-based filtering (analysis of photon energy and angular distribution parameters). By analyzing these parameters, the system can identify photons from the target zone versus adjacent zones without physically restricting the detection field, thereby maintaining both spatial resolution and photon quantity.
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 enables more efficient and accurate real-time localization of radiation sources by providing a cartographic representation of source probability, reducing unnecessary measurements and improving precision by accounting for photon origins from adjacent zones.
Implementation Method 1
The use of ionizing radiation detectors, such as electromagnetic radiation detectors (gamma or X photons), for locating a radiation source
Data Source
Figure 1a~1b
Figure 2a
Figure 2b
AI summary
The invention concerns a method of real-time mapping of a presence distribution of a source of photons in a site, the method comprising the steps consisting of measuring (100), at a plurality of measurement points, a photon flux in an energy bandwidth determined with a spectrometric detector, and noting the geographical co-ordinates of said point, and, at each measurement point, - from a response function of the detector, and information on the site, establishing a distribution of origins (200) of the photons around the measurement point, - from the distributions, representing (300), on a map of the site, a distribution of origin of photons, the method further comprising, for each measurement point starting from the second, a step (250) prior to the representing step (300), during which the distributions of origins of the photons around the current measurement point are correlated with those of previous measurement points.