Double-radiant-source framework for container detecting system

• US 7,215,737 B2
• Filed: 10/15/2004
• Issued: 05/08/2007
• Est. Priority Date: 10/16/2003
• Status: Active Grant

• Current Assignee: Nuctech Company Limited (Tsinghua Tongfang Co., Ltd.), Tsinghua University
• Original Assignee: Nuctech Company Limited (Tsinghua Tongfang Co., Ltd.), Tsinghua University
• Inventors: Li, Jianmin, Sun, Shangmin, Wang, Jianxin, Liang, Zhizhong, Su, Jianjun, Zhang, Qing, Wan, Jing
• Primary Examiner(s): Ho; Allen C.
• Application Number:
  US10/967,698
• Publication Number:
  US 20060018428A1
• Time in Patent Office: 935 Days
• Field of Search: 378/9, 378/57, 378/87, 378/90, 250/492.1, 250/493.1, 315/500, 315/505, 315/507
• US Class Current: 378/57
• CPC Class Codes: G01V 5/22 Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays

Abstract

A double-radiant-source framework used for a radiation detecting system for containers, having a horizontal accelerator, a vertical accelerator and a gantry tower composed of a left vertical girder, a right vertical girder, an upper cross girder, and a lower cross girder. A horizontal collimator and accelerator, and a vertical collimator and accelerator, are fixed on the left vertical girder and the upper cross girder of the gantry tower, respectively, and emit radiation beams as two planes oriented parallel to each other. Detector modules are disposed inside the double-detector arm of the right vertical girder, and inside the upper cross girder and the lower cross girder, respectively, to receive the two emitted planes of radiation beams. The container detecting system can reduce the area covered by the scanning channel of the system, and make the transportation, installation and use convenient, and improve the quality of the detected images.

Claims

1. A container detecting system, comprising:

a horizontal accelerator for emitting radiation,

a vertical accelerator for emitting radiation,

a gantry tower composed of a first vertical girder, a second vertical girder, an upper cross girder, and a lower cross girder, and defining a scanning channel,

a horizontal collimator disposed in front of the horizontal accelerator, and having a slit from which radiation is emitted to define a first plane of radiation,

a vertical collimator disposed in front of the vertical accelerator, and having a slit from which radiation is emitted to define a second plane of radiation that is parallel with the first plane of radiation,

a vertical collimation column for providing therein the horizontal collimator, and being fixed to the first vertical girder,

a horizontal collimation girder for providing therein the vertical collimator, and being fixed to the upper cross girder,

a double-detector arm mounted in the second vertical girder of the gantry tower, comprising a plurality of detector modules for receiving the first and second planes of radiation, the plurality of detector modules comprising a first horizontal beam detector module for receiving the first plane of radiation, and a first vertical beam detector module for receiving the second plane of radiation,

a second horizontal beam detector module for receiving the first plane of radiation,

a second vertical beam detector module for receiving the second plane of radiation, and

a supporting seat on a bottom surface, wherein a lower surface of the lower cross girder of the gantry tower is fixed with the supporting seat, a first end and a second -end of the lower cross girder is connected to the first vertical girder and to the second vertical girder, and a bearing plate is disposed on an upper surface of the lower cross girder for allowing a container truck to pass through the scanning channel.

2. The container detecting system according to claim 1, wherein said horizontal accelerator is mounted on a groundsill such that the radiation beam emitting from the horizontal accelerator and defined by the horizontal collimator is coplanar with the second horizontal beam detector module in the upper cross girder of the gantry tower and the first horizontal beam detector module of the double-detector arm, wherein the vertical accelerator is connected by a supporting frame with the upper cross girder of the gantry tower, such that the radiation beam emitting from the vertical accelerator and defined by the vertical collimator is coplanar with the second vertical beam detector module in the lower cross girder of the gantry tower and the first vertical beam detector module of the double-detector arm.

3. The container detecting system according to claim 2, wherein the second vertical girder, the upper cross girder, and the lower cross girder each comprise a box frame having a cavity surrounded by a bracket, whereby the cavity provides a channel for the flow of a cooling gas;

and a lead plate placed behind each of the detector modules for shielding radiation.

4. The container detecting system according to claim 3, further comprising tracks on the bearing plates for matching the wheels of the pulled container truck.

5. The container detecting system according to claim 1, wherein the second vertical girder, the upper cross girder, and the lower cross girder each comprise:

a box frame having a cavity surrounded by a bracket, whereby the cavity provides a channel for the flow of a cooling gas; and

a lead plate placed behind each of the detector modules for shielding radiation.

6. The container detecting system according to claim 5, further comprising tracks on the bearing plates for matching the wheels of the pulled container truck.

7. A container detecting system, comprising:

a horizontal accelerator,

a vertical accelerator,

a gantry tower composed of a left vertical girder, a right vertical girder, an upper cross girder, and a lower cross girder,

a horizontal collimator and a vertical collimator disposed in front of said horizontal accelerator and vertical accelerator, respectively;

a vertical collimation column for providing therein the horizontal collimator,

a horizontal collimation girder for providing therein the vertical collimator, wherein the vertical collimation column and the horizontal collimation girder are fixed on the left vertical girder and the upper cross girder of the gantry tower, respectively,

a horizontal collimation slit provided in the horizontal collimator from which radiation from the horizontal accelerator is emitted,

a vertical collimation slit provided in the vertical collimator from which radiation from the vertical accelerator is emitted, wherein the horizontal and the vertical collimation slits define radiation beams in two different planes parallel to each other,

a double-detector arm mounted in the right vertical girder of the gantry tower,

a plurality of detector modules for receiving, respectively, the radiation beams defined by and emitted from the horizontal collimator and the vertical collimator, provided in said double-detector arm, the plurality of detector modules comprising a first horizontal beam detector module and a first vertical beam detector module,

a second horizontal beam detector module for receiving radiation beams defined by and emitted from the horizontal collimator, disposed in the horizontal collimation girder of the upper cross girder in the gantry tower,

a second vertical beam detector module for receiving radiation beams defined by and emitted from the vertical collimator disposed in the lower cross girder in the gantry tower, and

a supporting seat on a bottom surface, wherein a lower surface of the lower cross girder of the gantry tower is fixed with the supporting seat, a first end and a second end of an upper surface of the lower cross girder are connected to the left vertical girder and the right vertical girder, respectively, and a bearing plate is paved between said lower surface and the upper surface of the lower cross girder for allowing a pulling truck to pass through a scanning channel.

8. A container detecting system, comprising:

a gantry tower comprising a first vertical girder, a second vertical girder, an upper cross girder, and a lower cross girder, and defining a scanning channel, and wherein a first end and a second end of the lower cross girder is connected to the first vertical girder and to the second vertical girder, respectively,

a horizontal accelerator for emitting radiation,

a vertically-disposed horizontal collimator disposed in front of the horizontal accelerator and having a slit from which emitted radiation from the horizontal accelerator defines a first plane of radiation emitting through the scanning channel,

a vertical accelerator for emitting radiation,

a horizontally-disposed vertical collimator disposed in front of the vertical accelerator and having a slit from which emitted radiation from the vertical accelerator defines a second plane of radiation emitting through the scanning channel, the second plane of radiation being parallel with the first plane of radiation,

a first vertically-disposed beam detector module for receiving a portion of the first plane of radiation,

a second vertically-disposed beam detector module for receiving a portion of the second plane of radiation, the first vertically-disposed beam detector module and second vertically-disposed beam detector module being mounted to the second vertical girder,

a first horizontally-disposed beam detector module for receiving a portion of the first plane of radiation, and being mounted to the upper cross girder,

a second horizontally-disposed beam detector module for receiving a portion of the second plane of radiation, and mounted to the lower cross girder, and

a bearing plate disposed on an upper surface of the lower cross girder for allowing a container truck to pass through the scanning channel.

9. The container detecting system according to claim 8, wherein the horizontal accelerator is mounted on a groundsill such that the radiation beam emitting from the horizontal accelerator and defined by the horizontal collimator is coplanar with the first horizontally-disposed beam detector module and the first vertically-disposed beam detector module, and wherein the vertical accelerator is connected by a supporting frame with the upper cross girder of the gantry tower, such that the radiation beam emitting from the vertical accelerator and defined by the vertical collimator is coplanar with the second horizontally-disposed beam detector module and the second vertically-disposed detector module.

10. The container detecting system according to claim 9, wherein the second vertical girder, the upper cross girder, and the lower cross girder each comprise a box frame having a cavity surrounded by a bracket, whereby the cavity provides a channel for the flow of a cooling gas;

and a lead plate placed behind each of the detector modules for shielding radiation.

11. The container detecting system according to claim 10, further comprising tracks on the bearing plates for matching the wheels of the container truck.

12. The container detecting system according to claim 8, wherein the second vertical girder, the upper cross girder, and the lower cross girder each comprise:

a box frame having a cavity surrounded by a bracket, whereby the cavity provides a channel for the flow of a cooling gas; and

a lead plate placed behind each of the detector modules for shielding radiation.

13. The container detecting system according to claim 12, further comprising tracks on the bearing plates for matching the wheels of the container truck.

14. The container detecting system according to claim 8 wherein the first vertically-disposed beam detector module and second vertically-disposed beam detector module are disposed in a double-arm detector mounted in the second vertical girder.

15. The container detecting system according to claim 8, further comprising a vertical collimation column, fixed to the first vertical girder, for providing therein the vertically-disposed horizontal collimator, and a horizontal collimation girder, fixed to the upper cross girder, for providing therein the horizontally-disposed vertical collimator.

16. The container detecting system according to claim 8, further a supporting seat on a bottom surface, wherein a lower surface of the lower cross girder of the gantry tower is fixed with the supporting seat.