Double-radiant-source framework for container detecting system

• US 20060018428A1
• Filed: 10/15/2004
• Published: 01/26/2006
• 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, Zhang, Qing, Sun, Shangmin, Wan, Jing, Wang, Jianxin, Liang, Zhizhong, Su, Jianjun
• Granted Patent: US 7,215,737 B2
• Time in Patent Office: Days
• 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 container detecting system, which belongs to the technical field of radiation detection, 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 a vertical collimator are disposed in front of the frontal face each of the horizontal accelerator and the vertical accelerator. The horizontal collimator and the vertical collimator are fixed on the left vertical girder and the upper cross girder of the gantry tower, respectively. The radiation beams defined by the horizontal collimator and the vertical collimator are two planes oriented parallel to each other. A double-detector arm is disposed inside the right vertical girder of the gantry tower, and detector modules are disposed inside the double-detector arm for receiving the two different planes of radiation beams defined by and emitted from the horizontal collimator and the vertical collimator. Detector modules are disposed inside the upper cross girder and the lower cross girder respectively for receiving separately radiation beams defined by and emitted from the horizontal collimator and the vertical collimator. 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 corrector and a vertical corrector disposed in front of the frontal faces of said horizontal accelerator and said vertical accelerator, respectively,

a horizontal collimator aligned with the horizontal corrector, and having a slit from which radiation is emitted to define a first plane of radiation,

a vertical collimator aligned with the vertical corrector, 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 left 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 right 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 detector module for receiving the first plane of radiation, and a first vertical detector module for receiving the second plane of radiation,

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

a second vertical 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, an end of the lower cross girder is connected to the left vertical girder and to the right vertical girder, and a bearing plate is disposed on the 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 and the horizontal corrector are mounted on the groundsill such that the radiation beam emitting from the horizontal accelerator and defined by the horizontal collimator is coplanar with the second horizontal detector module in the upper cross girder of the gantry tower and the first horizontal detector modules of the double-detector arm, wherein said the vertical accelerator and the vertical corrector are connected integrally by a supporting frame, which is fixed 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 detector module in the lower cross girder of the gantry tower and the first vertical detector module of the double-detector arm.

3. 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.

4. 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.

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

6. The container detecting system according to claim 4, 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 corrector and a vertical corrector disposed in front of the frontal faces of said horizontal accelerator and said vertical accelerator, respectively,

a horizontal collimator and a vertical collimator aligned with said horizontal corrector and said vertical corrector, 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,

a vertical collimation slit provided in the vertical collimator, 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 first horizontal detector modules and first vertical detector modules,

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

a second vertical detector module for receiving radiation beams defined by and emitted from the vertical collimator, disposed in the lower cross girdle 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, both ends of an upper surface of the lower cross girder are connected to the left vertical girder and the right vertical girder, 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.