Radiation sources and compact radiation scanning systems
First Claim
1. An X-ray source comprising:
- a housing defining a chamber to accelerate electrons and an output of the chamber, the chamber having a first longitudinal axis, wherein the output is aligned with the first longitudinal axis to allow passage of accelerated electrons from the chamber;
a tube defining a passage having a second longitudinal axis, the tube having a proximal end coupled to the output of the housing such that the second longitudinal axis is aligned with the first longitudinal axis and accelerated electrons can enter the passage;
a target material within the tube, wherein impact of the target material by accelerated electrons causes generation of X-ray radiation; and
non-rotatable shielding material around at least a portion of the tube around the target, the shielding material defining a slot therethrough to allow passage of generated radiation during operation;
wherein the slot is centered about an axis transverse to the first and second longitudinal axes.
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Accused Products
Abstract
An X-ray source is disclosed comprising a source of high energy electrons that travel along a longitudinal path. Target material lies along the longitudinal path and X-ray radiation is generated due to impact of the high energy electrons with the target. Shielding material is provided around at least a portion of the target. The shielding material defines a slot extending from the target to an exterior surface of the shielding material, to allow passage of generated radiation. The slot has an axis transverse to the longitudinal path. The axis may be perpendicular longitudinal path. The shielding material may define a plurality of slots having transverse axes. The source of high energy electrons may be a linear accelerator, for example. Scanning systems incorporating such sources are also disclosed. The scanning system comprises a conveying system having a longitudinal axis and the radiation source may be positioned so that the longitudinal path forms an acute angle with respect to the longitudinal axis, to decrease the size of the scanning unit as compared to a unit where the longitudinal axis is perpendicular to the longitudinal path. The longitudinal axis may be parallel to the longitudinal path, to form a more compact scanning system. A plurality of slots may be defined in the shielding material and a corresponding number of conveying systems may be provided to examine a plurality of objects concurrently. Methods of generating radiation and methods of examining objects are also disclosed.
233 Citations
106 Claims
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1. An X-ray source comprising:
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a housing defining a chamber to accelerate electrons and an output of the chamber, the chamber having a first longitudinal axis, wherein the output is aligned with the first longitudinal axis to allow passage of accelerated electrons from the chamber; a tube defining a passage having a second longitudinal axis, the tube having a proximal end coupled to the output of the housing such that the second longitudinal axis is aligned with the first longitudinal axis and accelerated electrons can enter the passage; a target material within the tube, wherein impact of the target material by accelerated electrons causes generation of X-ray radiation; and non-rotatable shielding material around at least a portion of the tube around the target, the shielding material defining a slot therethrough to allow passage of generated radiation during operation; wherein the slot is centered about an axis transverse to the first and second longitudinal axes. - 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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21. An X-ray source comprising:
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a linear accelerator defining a chamber to accelerate electrons and an output of the chamber, the chamber having a first longitudinal axis, wherein the output is aligned with the first longitudinal axis to allow passage of accelerated electrons from the chamber; a source of electrons associated with the chamber to emit electrons along the first longitudinal axis; a tube defining a passage having a second longitudinal axis, the tube having a proximal end with an input coupled to the output of the housing such that the second longitudinal axis is aligned with the first longitudinal axis and accelerated electrons can enter the passage; a target material of refractory metal at the distal end of the tube, along the second longitudinal axis, wherein impact of the target material by electrons causes generation of X-ray radiation; and shielding material around at least a portion of the tube around the target, the shielding material defining a slot, therethrough to allow passage of generated radiation resulting from impact of the emitted electrons on the target, during operation;
whereinthe slot being centered about an axis forming an angle with the first and second longitudinal axes within a range of 90 degrees plus or minus 10 degrees; and the slot extending only partially around the second longitudinal axis. - View Dependent Claims (22, 23, 24)
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25. An X-ray source, comprising:
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a source of high energy electrons, wherein the high energy electrons travel along a longitudinal path; a target material lying along the longitudinal path of the high energy electrons, the target material generating X-ray radiation due to impact of the high energy electrons with the target; and non-rotatable shielding material around at least a portion of the target, the shielding material defining a slot therethrough to allow passage of radiation resulting from impact of the high energy electrons on the target, during operation; wherein; the slot is centered about an axis transverse to the longitudinal path; and the slot extends only partially around the longitudinal path. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A system for examining an object, comprising:
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a conveyor system to move the object through the system along a longitudinal axis; and a source of radiation comprising; a source of high energy electrons, wherein the high energy electrons travel along a longitudinal path; a target material lying along the longitudinal path of the high energy electrons, the target material generating radiation due to impact of the high energy electrons with the target; and non-rotatable shielding material around at least a portion of the target, the shielding material defining a slot therethrough to allow passage of generated radiation, during operation; wherein; the slot is centered about an axis transverse to the longitudinal path; and the radiation source is positioned with respect to the conveying system such that radiation emitted through the slot will irradiate an object for inspection on the conveying system. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. A scanning system to examine objects, comprising:
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a conveyor system to move the object through the system along a longitudinal axis; a source of high energy electrons to emit electrons along a path; a bend magnet along the path; a first target material, the target material generating X-ray radiation due to impact of the high energy electrons with the target; and first shielding material around the first target material, the shielding material defining a first slot therethrough, the first slot being centered about an axis transverse to the path; a second target material, the target material generating X-ray radiation due to impact of the high energy electrons with the target; and second shielding material around the second target material, the second shielding material defining a second slot therethrough, the second slot being centered about an axis transverse to the path; wherein; the bend magnet is capable of selectively directing the high energy electrons to the first or the second target; and the first slot and the second slot are positioned with respect to the first conveying system to allow passage of generated radiation to irradiate different sides of the object on the conveying system, during operation. - View Dependent Claims (50)
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51. An X-ray scanning system to examine an object, comprising:
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a conveyor system to move the object through the system along a first longitudinal axis; and an elongated X-ray source configured to emit X-ray radiation with a peak energy of at least 1 MeV, during operation, the X-ray source having a second longitudinal axis and comprising a source of charged particles and a target, wherein the source of charged particles and the target lie along the second longitudinal axis and the charged particles travel from the source of charged particles to the target, along the second longitudinal axis; wherein the X-ray source is supported adjacent to the conveying system such that the first longitudinal axis is parallel to the second longitudinal axis. - View Dependent Claims (52, 53, 54, 55, 56)
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57. A method of generating X-ray radiation, comprising:
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colliding high energy electrons traveling along only a single axis with a target, the target being surrounded radially with respect to the axis by non-rotating shielding material, to generate radiation; and collimating the generated radiation into a radiation beam in a direction transverse to the axis and extending only partially around the axis by a slot through the shielding material. - View Dependent Claims (58, 59, 60, 61, 62, 63)
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64. A method of examining contents of an object with a radiation source, the method comprising:
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colliding high energy electrons traveling along a longitudinal path from a source to a point target along the path, the target being surrounded by non-rotating shielding material, to generate radiation; collimating the generated radiation into at least one radiation beam transverse to the longitudinal path by at least one respective slot through the shielding material, wherein the at least one respective slot extends only partially around the longitudinal path; irradiating the object with the radiation; and detecting radiation interacting with the object. - View Dependent Claims (65, 66, 67, 68, 69, 70, 71, 72)
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73. An X-ray source comprising:
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a housing defining a chamber to accelerate electrons and an output of the chamber, the chamber having a first longitudinal axis, wherein the output is aligned with the first longitudinal axis to allow passage of accelerated electrons from the chamber; a tube defining a passage having a second longitudinal axis, the tube having a proximal end coupled to the output of the housing such that the second longitudinal axis is aligned with the first longitudinal axis and accelerated electrons can enter the passage; a target material within the tube, wherein impact of the target material by accelerated electrons causes generation of X-ray radiation; and shielding material around at least a portion of the tube around the target, the shielding material defining a slot therethrough, the slot to allow passage of generated radiation, during operation; wherein the slot is centered about an axis transverse to the first and second longitudinal axes; the source further comprising; a bend magnet; a second tube coupling the bend magnet to the output of the housing, wherein the proximal end of the first tube is coupled to the output of the housing by the bend magnet and the second tube; a third tube having a first end coupled to the bend magnet; a second target material within the third tube; and second shielding material around at least a portion of the third tube surrounding the second target material, the second shielding material defining a second slot therethrough; whereby electrons exiting the housing are selectively directed through the first or third tube, to the first or second target, respectively, by the bend magnet. - View Dependent Claims (74, 75, 76, 77, 78)
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79. A radiation source comprising:
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a source of charged particles; a target material, wherein charged particles emitted by the source travel along a longitudinal path from the source to the target material, the target material generating radiation due to impact of the charged particles with the target, the radiation having a peak energy of at least 1 MeV, during operation, the longitudinal path lying along a longitudinal axis; and shielding material around at least a portion of the target, the shielding material defining a slot therethrough to allow passage of generated radiation, during operation; wherein the slot has a first dimension and a second dimension perpendicular to the first dimension, the first dimension lying in a plane including the longitudinal axis, the slot being centered about an axis in the first plane forming an angle with the longitudinal axis within a range of 90 degrees plus or minus 10 degrees, and the slot extends in the second dimension only partially around the longitudinal axis. - View Dependent Claims (80, 81, 82, 83, 84, 85)
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86. A source of X-ray radiation comprising:
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a housing defining a chamber to accelerate electrons and an output of the chamber, the chamber having a first longitudinal axis, wherein the output is aligned with the first longitudinal axis to allow passage of accelerated electrons from the chamber; a tube defining a passage having a second longitudinal axis, the tube having a proximal end coupled to the output of the housing such that the second longitudinal axis is aligned with the first longitudinal axis and accelerated electrons can enter the passage; a target material within the tube, wherein impact of the target material by accelerated electrons causes generation of radiation having a peak energy of at least 1 MeV; and immobile shielding material around at least a portion of the tube around the target, the shielding material defining a slot therethrough; wherein the slot has a first dimension and a second dimension perpendicular to the first dimension, the first dimension being in a plane transverse to the first and second longitudinal axes, to allow passage of generated radiation, during operation. - View Dependent Claims (87, 88)
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89. A radiation source comprising:
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a source of charged particles; a target material lying along a path traversed by the charged particles, wherein impact of the charged particles with the target causes generation of radiation; first shielding material around at least a portion of the target, the first shielding material defining a plurality of slots therethrough, at least some of the plurality of slots to allow passage of generated radiation, during operation; and multiple units of second shielding material movably coupled to the source to selectively place at least some of the plurality of respective slots in an opened state or a closed state to selectively allow passage of generated radiation through at least some of the plurality of respective slots. - View Dependent Claims (90, 91, 92, 93)
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94. A system for examining an object, comprising:
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at least first and second conveyor systems to position objects for examination; and a source of radiation comprising; a source of charged particles; a target material, wherein the charged particles travel from the source to the target material during operation, the target material generating radiation due to impact of the charged particles with the target material; shielding material around at least a portion of the target, the shielding material defining at least first and second slots therethrough to allow passage of generated radiation; wherein; the radiation source is positioned with respect to the first and second conveyor systems such that radiation passing through the first and second slots irradiate objects on the first and second conveyor systems, respectively, for examination; and the system further comprising; means for opening and closing the first slot to selectively allow passage of generated radiation; and means for opening and closing the second slot to selectively allow passage of generated radiation. - View Dependent Claims (95, 96, 97, 98, 99, 100)
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101. A method of generating radiation, comprising:
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colliding charged particles with a target along first axis to generate radiation having a peak energy of at least 1 MeV; and collimating the generated radiation into a radiation beam centered about a second axis forming an angle with the first axis within a range of 90 degrees plus or minus 10 degrees, the radiation beam extending only partially around the first axis.
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102. A radiation scanning system to examine an object, comprising:
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a conveyor system to move an object through the system along a first longitudinal axis; and an elongated radiation source comprising a source of charged particles and a point target along a second longitudinal axis, wherein the charged particles travel along the second longitudinal axis from the source of charged particles to the target during operation, the radiation source emitting radiation with a peak energy of at least 1 MeV, during operation; wherein the radiation source is supported adjacent to the conveying system such that the first longitudinal axis and the second longitudinal axis are parallel or form an angle of up to 45 degrees. - View Dependent Claims (103, 104)
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105. A radiation source comprising:
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a source of charged particles; a target material lying along a path traversed by the charged particles, wherein of the charged particles with the target causes generation of radiation; first shielding material around at least a portion of the target, the first shielding material defining a plurality of slots therethrough, at least some of the plurality of slots allow passage of generated radiation, during operation; and second shielding material coupled to the source to selectively open and close at least some of the plurality of slots.
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106. A method of examining contents of an object with a radiation source, the method comprising:
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colliding high energy electrons traveling along a longitudinal path from a source to a point target along the path, the target being surrounded by non-rotating shielding material, to generate radiation; collimating the generated radiation into at least one radiation beam transverse to the longitudinal path by at least one respective slot through the shielding material; irradiating the object with the radiation; and detecting radiation transmitted through the object.
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Specification