SYSTEM AND METHOD FOR HIGH Z MATERIAL DETECTION
First Claim
1. A system for a high Z material detection, comprising:
- at least a first muon detector and a second muon detector, the first muon detector is indicative of an incidence angle, and the second muon detector is indicative of an actual leaving angle for each muon passing the system;
a muon velocity measurement unit, measuring a velocity for each incoming muon,a digital signal processing unit forstoring a data on the incidence, the actual leaving angle and the velocity for muons passing the system during an exposure time T;
calculating an actual statistics of the actual leaving angles being dependent on the muon velocity and an expected statistics of expected leaving angles, wherein the expected statistics of the expected leaving angle is estimated assuming absence of the high Z material in between the first and the second muon detector;
finding a difference between the actual and the expected statistics; and
determining a presence of the high Z material inside the system when the difference is above a predetermined difference value.
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Abstract
A method and system for high Z material revealing using muon detection technique is presented. The system measures muons'"'"' coordinates, velocities, incidence angles and leaving angles. Two series of detectors: one above and one below the interrogated volume are used. A muon trajectory deviation from an expected trajectory is used for the decision making on the presence of high Z material inside the volume. The muon velocity is measured using either a ring Cerenkov counter, a transition radiation detector or/and a threshold Cerenkov counter. The expected trajectory is calculated basing on known particle velocity.
16 Citations
20 Claims
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1. A system for a high Z material detection, comprising:
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at least a first muon detector and a second muon detector, the first muon detector is indicative of an incidence angle, and the second muon detector is indicative of an actual leaving angle for each muon passing the system; a muon velocity measurement unit, measuring a velocity for each incoming muon, a digital signal processing unit for storing a data on the incidence, the actual leaving angle and the velocity for muons passing the system during an exposure time T; calculating an actual statistics of the actual leaving angles being dependent on the muon velocity and an expected statistics of expected leaving angles, wherein the expected statistics of the expected leaving angle is estimated assuming absence of the high Z material in between the first and the second muon detector; finding a difference between the actual and the expected statistics; and determining a presence of the high Z material inside the system when the difference is above a predetermined difference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for high Z material revealing, comprising:
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continuously measuring an incident angle and velocity for each incoming muon; continuously measuring an actual leaving angle for each incoming muon by the second detector; estimating an expected statistics of an expected leaving angle and an actual leaving angle statistics of the actual leaving angle being dependent on the muon velocity for each incoming muon; storing a data on the incident, the actual and the expected leaving angles; calculating an actual statistics of the actual leaving angle; finding a difference between the expected and the actual statistics; and
determining a presence of high Z material in between the first and the second muon detector when the difference exceeds a predetermined difference value. - View Dependent Claims (17, 18, 19, 20)
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Specification