Composite gamma-neutron detection system
First Claim
1. A gamma-neutron detector, comprising:
- a first layer of neutron sensitive composite scintillator; and
a second and a third layer of gamma sensitive scintillators, wherein the first layer is positioned between the second and third layers and wherein the second and third layers comprise plastic scintillators with a fast decay time and the first layer comprises scintillators with a slower decay time.
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Abstract
The present invention provides a gamma-neutron detector based on mixtures of thermal neutron absorbers that produce heavy-particle emission following thermal capture. In one configuration, B-10 based detector is used in a parallel electrode plate geometry that integrates neutron moderating sheets, such as polyethylene, on the back of the electrode plates to thermalize the neutrons and then detect them with high efficiency. The moderator can also be replaced with plastic scintillator sheets viewed with a large area photomultiplier tube to detect gamma-rays as well. The detector can be used in several scanning configurations including portal, drive-through, drive-by, handheld and backpack, etc.
197 Citations
18 Claims
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1. A gamma-neutron detector, comprising:
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a first layer of neutron sensitive composite scintillator; and a second and a third layer of gamma sensitive scintillators, wherein the first layer is positioned between the second and third layers and wherein the second and third layers comprise plastic scintillators with a fast decay time and the first layer comprises scintillators with a slower decay time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A gamma-neutron detector, comprising:
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a first layer of neutron sensitive composite scintillator; and a second and a third layer of gamma sensitive scintillators, wherein the first layer is positioned between the second and third layers and wherein the second and third layers respectively form front and back panels of different thicknesses.
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11. A gamma-neutron detector, comprising:
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a gamma detector of plastic scintillator; a neutron detector having at least one screen comprising a mixture of silver activated ZnS and one of Li-6 or B-10; at least one photodetector to collect and convert light produced by the neutron and gamma detectors, respectively, into neutron and gamma events; and a reflector foil positioned between the at least one screen and the plastic scintillator, wherein the at least one screen is embedded in a transparent hydrogenous light guide. - View Dependent Claims (12)
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13. A detector comprising at least one neutron cell, the said at least one neutron cell comprising:
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a first and a second layer comprising B-10 for capturing neutrons; and a cell layer, comprising gas, positioned between the first and second layers, wherein, when a neutron is captured, the first and second layers emit charged particles that ionize the gas in the cell layer creating free electron and ion pairs. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification