Radiation Backscatter Detector Using Multi-Energy Source Arrays
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Solution Overview
Problem
Current radiation detection methods, such as X-ray backscatter detectors, face challenges in quickly and accurately identifying concealed explosive and narcotic materials due to complex image interpretation and the need for a more portable and efficient deployment, especially in security screening scenarios like aircraft boarding and landing.
Innovation Solution
A radiation backscatter detector system comprising a source array generating radiation in different energy bands, a detector array with silicon photomultiplier tiles for low-level photon detection, and an energy meter to measure pulse outputs, allowing for pulse count ratio analysis to distinguish material groups, including explosives and narcotics, with a tiled array configuration for comprehensive scanning without gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If X-ray backscatter detection is used to detect concealed materials, then material detection capability is improved, but image complexity increases making interpretation difficult within short time windows
Solution Approach 1:
The patent segments the detection process by dividing the energy spectrum into multiple discrete energy bands and using separate detector elements for different spatial portions. This segmentation allows the system to process and analyze specific energy ranges independently, simplifying the interpretation task by presenting organized spectral data rather than complex continuous images.
Solution Approach 2:
The patent applies spectral fingerprinting where different materials are identified by their characteristic energy distribution patterns across multiple bands. By assigning different energy bands to different detector elements and analyzing the relative counts in each band, the system creates a spectral signature similar to color coding, enabling rapid material identification without complex image interpretation.
2Reliability
If traditional X-ray detection systems are used, then material detection is achieved, but portability is reduced requiring fixed installation
Solution Approach 1:
The detector array is divided into multiple independent detector elements that can be configured in different geometries. This modular segmentation allows the system to be adapted for portable applications while maintaining detection capability, as the segmented architecture enables flexible deployment configurations including handheld or vehicle-mounted arrangements.
Solution Approach 2:
The patent employs multiple energy bands with different photon energy ranges to detect materials. By optimizing the energy band parameters and using appropriate radiation sources for each band, the system achieves effective material detection with reduced overall system mass compared to single-energy high-power systems, enabling portable deployment.
3Area of stationary object
If multiple detector elements are used to cover shared sample location, then measurement coverage is improved, but distinguishing outputs from different detector elements becomes challenging
Solution Approach 1:
Each detector element is assigned to detect radiation from specific spatial portions of the sample location, creating a mapping between detector element position and sample region. This local quality assignment ensures that signals from different spatial locations are inherently distinguished by their originating detector element, simplifying the differentiation task while maintaining comprehensive coverage.
Solution Approach 2:
The patent introduces an energy dimension by measuring radiation in multiple discrete energy bands. By combining spatial information from different detector elements with spectral information from different energy bands, the system creates a multi-dimensional data structure that uniquely identifies radiation events, making it straightforward to distinguish outputs from different detector elements and sample portions.
4Productivity
If pulse count ratio analysis is used to distinguish material groups, then material identification speed is improved, but precision in identifying individual materials is reduced
Solution Approach 1:
The patent uses spectral fingerprinting where materials are identified by their characteristic patterns of pulse counts across multiple energy bands. This approach provides rapid identification by comparing spectral signatures, achieving fast material group classification. The system accepts that individual material precision is reduced in favor of speed, but maintains sufficient precision for security applications where material group identification (e.g., explosives vs. narcotics vs. benign materials) is the primary goal.
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
The system enables rapid and accurate material identification by distinguishing material groups through pulse count ratios, even at low backscatter levels, enhancing security screening efficiency and portability for ad-hoc deployments.
Implementation Method 1
a source array comprising source components for irradiating a shared sample location, at least two source components of the array generating radiation in different respective source energy bands
Implementation Method 2
a radiation backscatter detector comprising... detector elements for detecting backscattered radiation detection events from different respective spatial portions of the shared sample location
Implementation Method 3
the detector elements each generating a pulse output in response to each radiation detection event it detects; and an energy meter for measuring the energies of the pulse outputs
Implementation Method 4
In order to measure a characteristic response in different energy bands, even at extremely low backscatter levels, it is possible to use a scintillator together with a photo-multiplying detector. In order to achieve the scale necessary to map material distribution across the kind of devices that might have been used for concealment in the modern day, embodiments of the invention may comprise a silicon photomultiplier. Known silicon photomultipliers are based on an array of avalanche photodiodes (APDs), each of which has its own output
Data Source
AI summary
A radiation backscatter detector assembly comprising:a source array comprising source components for irradiating a shared sample location, at least two source components of the array generating radiation in different respective source energy bands;a detector array comprising detector elements for detecting backscattered radiation detection events from different respective spatial portions of the shared sample location, the detector elements each generating a pulse output in response to each radiation detection event it detects; andan energy meter for measuring the energies of the pulse outputs by different respective detector elements.