Cosmic Ray Muon Electron Material Discrimination
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Solution Overview
Problem
Current cosmic-ray tomography systems are limited in their ability to detect and characterize lighter metals such as silver, gold, and platinum, as well as differentiate between various materials, particularly those with similar densities, which hampers effective non-destructive inspection and nuclear threat detection.
Innovation Solution
The technique involves determining a scattering metric and a stopping metric for cosmic ray charged particles interacting with a material, computing a scattering-to-stopping ratio, and establishing a relationship between these metrics to identify and characterize materials, utilizing cosmic ray-produced muons and electrons to differentiate between materials based on their scattering and stopping properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cosmic ray tomography uses only muon scattering detection, then heavy materials like lead and uranium can be detected, but lighter metals such as silver, gold, and platinum cannot be effectively distinguished
Solution Approach 1:
The patent combines muon scattering detection with electron scattering detection into a single integrated system. By merging these two detection methods, the system can detect both heavy materials (via muons) and lighter metals (via electrons), thereby expanding the detection range while maintaining high precision across different material densities.
Solution Approach 2:
The patent utilizes different physical parameters for detection: muon scattering angle for heavy materials and electron scattering properties for lighter metals. By changing the detection parameter based on material density, the system achieves versatile detection across the full range of materials including silver, gold, platinum, and uranium.
2Adaptability or versatility
If multiple radiation-based detectors are used to detect different materials, then detection coverage is improved, but system complexity and cost increase
Solution Approach 1:
The patent creates a universal detection system that uses both muons and electrons from cosmic rays to detect all types of materials through a single integrated apparatus. This multi-functional approach eliminates the need for separate radiation-based detectors for different material types, reducing system complexity while maintaining comprehensive detection coverage.
Solution Approach 2:
The system utilizes naturally occurring cosmic rays (muons and electrons) as the radiation source, eliminating the need for artificial radiation sources and multiple specialized detectors. The cosmic rays themselves provide the detection capability for both heavy and light materials, simplifying the overall system architecture.
3Measurement precision
If Gamma and X-ray detectors are used for material detection, then detection capability is achieved, but shielding materials reduce count rates and detection performance
Solution Approach 1:
The patent replaces electromagnetic radiation-based detection (Gamma and X-ray) with cosmic ray particle detection (muons and electrons). This substitution allows direct particle scattering measurement that is not attenuated by shielding materials, thereby maintaining detection capability even in the presence of dense shielding that would block electromagnetic radiation.
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 the detection and characterization of a wide range of materials, including special nuclear materials and commercially important metals like silver, gold, and platinum, with enhanced sensitivity and accuracy, facilitating robust nuclear material detection and reducing the need for multiple radiation-based detectors.
Implementation Method 1
Coulomb scattering from atomic nuclei in matter results in a very large number of small angle deflections of charged particles as they transit the matter
Implementation Method 2
Such cosmic ray-produced charged particles slowly lose energy through electromagnetic interactions
Data Source
AI summary
In one aspect, a process for characterizing a range of materials based on the scattering and stopping of incident cosmic ray charged particles passing through each material includes: determining a scattering metric and a stopping metric for each material within the range of materials exposed to cosmic ray charged particles; computing a ratio of the scattering metric to the stopping metric to obtain a scattering-to-stopping ratio for each material within the range of materials for the material; and establishing a scattering-stopping relationship for the range of materials based on the determined pairs of the scattering-to-stopping ratio and the associated scattering metric for the range of materials.