Systems and methods for high-Z threat alarm resolution
First Claim
1. A screening system to resolve an alarm detected in a cargo positioned within a scanning volume, wherein said screening system comprises a first muon detector, a second muon detector, a detector configured to detect muons, and, a processing unit, wherein said processing unit is configured to:
- receive a plurality of threat sensitivity vectors;
record coordinates and directions of muons entering and leaving the scanning volume;
record measurements of momentum of said muons;
receive a two dimensional or three dimensional mass density map;
use the two dimensional or three dimensional mass density map and the measurements of momentum of said muons to determine an expected energy loss of said muons as said muons traverse the scanned volume;
use said an expected energy loss to determine an expected muon momentum at each point along its path; and
use said expected muon momentum at each point along its path to reconstruct a 3D scattering density map.
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Accused Products
Abstract
A second stage screening system configured to resolve a threat alarm detected in a cargo by a first stage screening system. The second stage screening system includes layers of first muon detectors placed above the cargo to detect a first coordinate and an angle of incidence of incoming muons and layers of second muon detectors placed below the cargo to detect an actual coordinate and an actual angle of exit of the incoming muons. The first and second detectors measure a momentum of the incoming muons. A processing unit receives threat sensitivity vectors determined from the first stage, operates a cargo positioning system that centers a high-Z threat within the cargo, relative to the first and second muon detectors, and analyzes the momentum and a distribution of deflection angles between the angles of incidence and exit to resolve the threat alarm.
488 Citations
20 Claims
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1. A screening system to resolve an alarm detected in a cargo positioned within a scanning volume, wherein said screening system comprises a first muon detector, a second muon detector, a detector configured to detect muons, and, a processing unit, wherein said processing unit is configured to:
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receive a plurality of threat sensitivity vectors; record coordinates and directions of muons entering and leaving the scanning volume; record measurements of momentum of said muons; receive a two dimensional or three dimensional mass density map; use the two dimensional or three dimensional mass density map and the measurements of momentum of said muons to determine an expected energy loss of said muons as said muons traverse the scanned volume; use said an expected energy loss to determine an expected muon momentum at each point along its path; and use said expected muon momentum at each point along its path to reconstruct a 3D scattering density map. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification