SOLID-STATE NEUTRON AND ALPHA PARTICLES DETECTOR AND METHODS FOR MANUFACTURING AND USE THEREOF

• US 20090302226A1
• Filed: 02/08/2006
• Published: 12/10/2009
• Est. Priority Date: 02/08/2005
• Status: Abandoned Application

• Current Assignee: Yissum Research Development Company of the Hebrew University of Jerusalem Ltd. (Hebrew University of Jerusalem)
• Original Assignee: Yissum Research Development Company of the Hebrew University of Jerusalem Ltd. (Hebrew University of Jerusalem)
• Inventors: Schieber, Michael M., Zuck, Assaf, Marom, Gad
• Application Number:
  US11/883,842
• Publication Number:
  US 20090302226A1
• Time in Patent Office: Days
• US Class Current: 250/370.20
• CPC Class Codes: G01T 3/08 with semiconductor detectors

Abstract

A solid-state detector for detection of neutron and alpha particles detector and methods for manufacturing and use thereof are described. The detector has an active region formed of a polycrystalline semiconductor compound comprising a particulate semiconductor material sensitive to neutron and alpha particles radiation imbedded in a binder. The particulate semiconductor material contains at least one element sensitive to neutron and alpha particles radiation, selected from a group including 10Boron, 6Lithium, 113Cadmium, 157Gadolinium and 199Mercury. The semiconductor compound is sandwiched between an electrode assembly configured to detect the neutron and alpha particles interacting with the bulk of the active region. The binder can be either an organic polymer binder or inorganic binder. The organic polymer binder comprises at least one polymer that can be selected from the group comprising polystyrene, polypropylene, Humiseal™ and Nylon-6. The inorganic binder can be selected from B2O3, PbO/B2O3/, Bi2O3/PbO, Borax glass, Bismuth Borate glass and Boron Oxide based glass.

Claims

1-49. -49. (canceled)

50. A polycrystalline semiconductor compound for use in a solid-state neutron detector, comprising a particulate semiconductor material sensitive to neutron and alpha particles radiation imbedded in a binder, said particulate semiconductor material containing at least one element sensitive to neutron and alpha particles radiation, selected from ¹⁰Boron, ⁶Lithium, ¹¹³Cadmium, ¹⁵⁷Gadolinium and ¹⁹⁹Mercury,

said binder possessing one of the following features:

(i) said binder is an organic polymer binder comprising at least one polymer selected from polystyrene, polypropylene, Humiseal™ and

Nylon-6;

(ii) said binder is an inorganic binder selected from B₂O₃, PbO/B₂O₃/, Bi₂O₃/PbO, Borax glass, Bismuth Borate glass and Boron Oxide based glass.

51. The polycrystalline semiconductor compound of claim 50 wherein a mean grain size of said particulate semiconductor material is in the range of 10 nm to 100 microns.

52. The polycrystalline semiconductor compound of claim 50 wherein said particulate semiconductor material is selected from the group comprising:

BC, BP, BN, BaB₂O₄, LiF, LiNbO₃, Li₂B₂O₄, Li₂B₄O₇, Li₃PO₄, CdS, CdSe, CdTe, Gd₂S₃, Gd₂O₃, Gd₂F₃, CdZnTe, HgBrI and HgI₂.

53. The polycrystalline semiconductor compound of claim 50 wherein a ratio of said particulate semiconductor material to said binder is in the range of 5:

95 in weight % to 95;

5 in weight %.

54. A solid-state neutron and alpha particles detector having an active region formed of a polycrystalline semiconductor compound comprising a particulate semiconductor material sensitive to neutron and alpha particles radiation imbedded in a binder, said particulate semiconductor material containing at least one element sensitive to neutron and alpha particles radiation, selected from a group including ¹⁰Boron, ⁶Lithium, ¹¹³Cadmium, ¹⁵⁷Gadolinium and ¹⁹⁹Mercury, said semiconductor compound being sandwiched between an electrode assembly configured to detect the neutron and alpha particles interacting with the bulk of said active region,

said binder possessing one of the following features:

(i) said binder is an organic polymer binder comprising at least one polymer selected from polystyrene, polypropylene, Humiseal™ and

Nylon-6;

(ii) said binder is an inorganic binder selected from B₂O₃, PbO/B₂O₃/, Bi₂O₃/PbO, Borax glass, Bismuth Borate glass and Boron Oxide based glass.

55. The solid-state neutron and alpha particles detector of claim 54 wherein a mean grain size of said particulate semiconductor material is in the range of 10 nm to 100 microns.

56. The solid-state neutron and alpha particles detector of claim 54 wherein said particulate semiconductor material is selected from the group comprising:

BC, BP, BN, BaB₂O₄, LiF, LiNbO₃, Li₂B₂O₄, Li₂B₄O₇, Li₃PO₄, CdS, CdSe, CdTe, Gd₂S₃, Gd₂O₃, Gd₂F₃, CdZnTe, HgBrI and HgI₂.

57. The solid-state neutron and alpha particles detector of claim 54 wherein a ratio of said particulate semiconductor material to said binder is in the range of 5:

95 in weight % to 95;

5 in weight %.

58. The solid-state neutron and alpha particles detector of claim 54 wherein said electrode assembly comprises a continuous upper electrode, a bottom electrode associated with a detection pixilated substrate, and an electronic readout system coupled to the upper electrode and the bottom electrode.

59. The solid-state neutron and alpha particles detector of claim 58 wherein said detection pixilated substrate is a focal pixel array constituted by an assembly of pixel elements comprising a set of stripe electrodes mounted on a top surface of a substrate containing readout electronic circuits used for analyzing detected signals.

60. The solid-state neutron and alpha particles detector of claim 59 wherein each pixel element is based on a readout electronic element selected from a Complementary Metal Oxide Semiconductor (C-MOS) chip, a charge coupled device (CCD) and Thin Film Transistor (TFT) electronics, all configured for obtaining an electron/hole current generated in the active region.

61. The solid-state neutron and alpha particles detector of claim 58 wherein said continuous upper electrode is made of at least one material selected from Aquadag, copper and aluminum.

62. An imaging system for imaging an object, the system comprising:

(a) a solid-state neutron and alpha particles detector placed in a location to be exposed to a stream of neutrons passing through said object, said solid-state neutron and alpha particles detector having an active region made of a polycrystalline semiconductor compound comprising a particulate semiconductor material sensitive to neutron and alpha particles radiation imbedded in a binder, said particulate semiconductor material containing at least one element sensitive to neutron and alpha particles radiation, selected from a group including ¹⁰Boron, ⁶Lithium, ¹¹³Cadmium, ¹⁵⁷Gadolinium and ¹⁹⁹Mercury, said semiconductor compound being sandwiched between a continuous upper electrode and a bottom electrode associated with a detection pixilated substrate constituted by an array of pixel elements,

said binder possessing one of the following features;

(i) said binder is an organic polymer binder comprising at least one polymer selected from polystyrene, polypropylene, Humiseal™ and

Nylon-6;

(ii) said binder is an inorganic binder selected from B₂O₃, PbO/B₂O₃/, Bi₂O₃/PbO, Borax glass, Bismuth Borate glass and Boron Oxide based glass;

(b) a processing system coupled to said detection pixilated substrate and adapted for reading the current, performing image processing and generating a signal indicative of said object; and

(c) an image display coupled to said processing system and configured for obtaining said signal, thereby displaying the object.

63. The imaging system of claim 62 wherein a mean grain size of said particulate semiconductor material is in the range of 10 nm to 100 microns.

64. The imaging system of claim 62 wherein said particulate semiconductor material is selected from the group comprising:

BC, BP, BN, BaB₂O₄, LiF, LiNbO₃, Li₂B₂O₄, Li₂B₄O₇, Li₃PO₄, CdS, CdSe, CdTe, Gd₂S₃, Gd₂O₃, Gd₂F₃, CdZnTe, HgBrI and HgI₂.

65. The imaging system of claim 62 wherein a ratio of said particulate semiconductor material to said binder is in the range of 5:

95 in weight % to 95;

5 in weight %.

66. The imaging system of claim 62 wherein said pixel elements comprise a set of stripe electrodes mounted on an upper surface of a substrate containing readout electronic circuits used for analyzing detected signals.

67. The imaging system of claim 62 wherein each pixel element is based on a readout electronic element selected from a Complementary Metal Oxide Semiconductor (C-MOS) chip, a charge coupled device (CCD) and Thin Film Transistor (TFT) electronics, all configured for obtaining an electron/hole current generated in said active region.

68. A method of fabrication of a solid state neutron and alpha particles detector, comprising:

(a) providing a polycrystalline semiconductor compound comprising a particulate semiconductor material sensitive to neutron and alpha particles radiation imbedded in a binder, said particulate semiconductor material containing at least one element sensitive to neutron and alpha particles radiation, selected from a group including ¹⁰Boron, ⁶Lithium, ¹¹³Cadmium, ¹⁵⁷Gadolinium and ¹⁹⁹Mercury;

said binder possessing one of the following features;

(i) said binder is an organic polymer binder comprising at least one polymer selected from polystyrene, polypropylene, Humiseal™ and

Nylon-6;

(ii) said binder is an inorganic binder selected from B₂O₃, PbO/B₂O₃/, Bi₂O₃/PbO, Borax glass, Bismuth Borate glass and Boron Oxide based glass;

(b) attaching the polycrystalline semiconductor compound to a detection pixilated substrate constituted by an array of pixel elements; and

(c) depositing a continuous layer of conductive material on said bulk plate, thereby to form a continuous electrode of the detector.

69. The method of claim 68 wherein said providing of the polycrystalline semiconductor compound comprises preparing polycrystalline semiconductor material sensitive to neutron and alpha particles radiation, providing the binder, and mixing the polycrystalline semiconductor particles with the binder.

70. The method of claim 68 wherein said polycrystalline semiconductor compound is prepared as slurry, and said attaching of the slurry is carried out by a coating method.

71. The method of claim 70 wherein said coating method is either Dr. Blade coating method.

72. The method of claim 68 wherein said polycrystalline semiconductor compound is prepared as bulk plate, and said attaching of the plate is carried out by gluing.

73. The method of claim 72 wherein said gluing is carried out by a “

flip-chip”

technology.

74. The method of claim 68 wherein a mean grain size of said particulate semiconductor material is in the range of 10 nm to 100 microns.

75. The method of claim 68 wherein said particulate semiconductor material is selected from the group comprising:

BC, BP, BN, BaB₂O₄, LiF, LiNbO₃, Li₂B₂O₄, Li₂B₄O₇, Li₃PO₄, CdS, CdSe, CdTe, Gd₂S₃, Gd₂O₃, Gd₂F₃, CdZnTe, HgBrI and HgI₂.

76. The method of claim 68 wherein a ratio of said particulate semiconductor material to said binder is in the range of 5:

95 in weight % to 95;

5 in weight %.

77. A method of detecting neutrons and alpha particles, the method comprising:

(a) positioning a solid state neutron and alpha particles detector in a location to allow the detector to intercept a stream of neutrons and/or alpha particles, said solid-state neutron and alpha particles detector having an active region made of a polycrystalline semiconductor compound comprising a particulate semiconductor material sensitive to neutron and alpha particles radiation imbedded in a binder, said particulate semiconductor material containing at least one element sensitive to neutron and alpha particles radiation, selected from a group including ¹⁰Boron, ⁶Lithium, ¹¹³Cadmium, ¹⁵⁷Gadolinium and ¹⁹⁹Mercury, said semiconductor compound being sandwiched between a continuous upper electrode and a bottom electrode associated with a detection pixilated substrate constituted by an array of pixel elements,

said binder possessing one of the following features;

(i) said binder is an organic polymer binder comprising at least one polymer selected from polystyrene, polypropylene, Humiseal™ and

Nylon-6;

(ii) said binder is an inorganic binder selected from B₂O₃, PbO/B₂O₃/, Bi₂O₃/PbO, Borax glass, Bismuth Borate glass and Boron Oxide based glass;

(b) applying electric field is applied between the upper and bottom electrodes by applying high voltage thereacross, and

(c) reading the current from the detection pixilated substrate.

78. The method of detecting neutrons and alpha particles of claim 77 wherein said particulate semiconductor material is selected from the group comprising:

BC, BP, BN, BaB₂O₄, LiF, LiNbO₃, Li₂B₂O₄, Li₂B₄O₇, Li₃PO₄, CdS, CdSe, CdTe, Gd₂S₃, Gd₂O₃, Gd₂F₃, CdZnTe, HgBrI and HgI₂.

79. A method for imaging an object containing elements sensitive to neutron radiation, comprising:

(a) providing a solid-state neutron and alpha particles detector having an active region made of a polycrystalline semiconductor compound comprising a particulate semiconductor material sensitive to neutron radiation imbedded in a binder, said particulate semiconductor material containing at least one element sensitive to neutron and alpha particles radiation, selected from a group including ¹⁰Boron, ⁶Lithium, ¹¹³Cadmium, ¹⁵⁷Gadolinium and Mercury, said semiconductor compound being sandwiched between a continuous upper electrode and a bottom electrode associated with a detection pixilated substrate constituted by an array of pixel elements,

said binder possessing one of the following features;

(i) said binder is an organic polymer binder comprising at least one polymer selected from polystyrene, polypropylene, Humiseal™ and

Nylon-6;

(ii) said binder is an inorganic binder selected from B₂O₃, PbO/B₂O₃/, Bi₂O₃/PbO, Borax glass, Bismuth Borate glass and Boron Oxide based glass;

(b) placing said solid-state neutron and alpha particles detector in a location to allow the detector to intercept a stream of neutrons, said solid-state neutron passing through said object

(c) applying electric field between the upper and bottom electrodes by applying high voltage thereacross,

(d) reading the current from the detection pixilated substrate;

(e) performing image processing and generating a signal indicative of said object; and

(f) displaying at least a part of the object containing elements sensitive to neutron radiation.

80. The method for imaging of claim 79 wherein said particulate semiconductor material is selected from the group comprising:

BC, BP, BN, BaB₂O₄, LiF, LiNbO₃, Li₂B₂O₄, Li₂B₄O₇, Li₃PO₄, CdS, CdSe, CdTe, Gd₂S₃, Gd₂O₃, Gd₂F₃, CdZnTe, HgBrI and HgI₂.