Multiple technologies composite scintillation detector device

Patent metadata

Field	Value
Publication number	US-9322933-B2
Application number	US-201414576674-A
Country	US
Kind code	B2
Filing date	Dec 19, 2014
Priority date	Dec 30, 2013
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

The invention presents a backscattering scintillation detector. The scintillation detector includes a scintillation crystal detector; a X-ray sensitizing screen, which is disposed forward the scintillation crystal detector and where a backscattered X-ray from an object to be detected is processed and then at least part of the processed X-ray is incident to scintillation crystal detector; and photoelectric multiplier, which is disposed backward the scintillation crystal detector and is configured to collect a light signal from scintillation crystal detector and convert it to an electrical signal. Through the above preferable embodiment, a X-ray sensitizing screen, a scintillation crystal detector, and light guiding and wave-drifting technologies are combined together to obtain a novel scintillation detector, which can improve detection of X-ray, transmission of light signal and conversion of light signal to electrical signal.

First claim

The invention claimed is:

1. A scintillation detector device, comprising:
a scintillation crystal detector;
a X-ray sensitizing screen, which is disposed forward the scintillation crystal detector and where a backscattered X-ray from an object to be detected is processed and then at least part of the processed X-ray is incident to the scintillation crystal detector; and
a photoelectric multiplier, which is disposed backward the scintillation crystal detector and is configured to collect a light signal from the scintillation crystal detector and convert it to an electrical signal.

2. The scintillation detector device according to claim 1 , further comprising a reflective layer, which is disposed forward the X-ray sensitizing screen and is configured to reflect a light signal from the X-ray sensitizing screen.

3. The scintillation detector device according to claim 2 , further comprising a light shielding layer, which is disposed forward the reflective layer and is configured to shield against a visible light entering into the backscattering scintillation detector device from outside.

4. The scintillation detector device according to claim 3 , further comprising a photoelectric coupling medium, which is disposed between the scintillation crystal detector and the photoelectric multiplier and is configured to couple to the light signal transferred between the scintillation crystal detector and the photoelectric multiplier.

5. The scintillation detector device according to claim 4 , wherein,
the photoelectric coupling medium comprises an industrial transparent silicone.

6. The scintillation detector device according to claim 3 , wherein,
the X-ray sensitizing screen can be selected as a metal sensitizing screen, a fluorescent sensitizing screen or a metal-fluorescent composite sensitizing screen.

7. The scintillation detector device according to claim 6 , wherein,
a metal composition of the metal sensitizing screen can be selected as plumbum, tungsten, tantalum, molybdenum, copper or iron.

8. The scintillation detector device according to claim 6 , the fluorescent sensitizing screen can be made from calcium tungstate or barium fluochloride.

9. The scintillation detector device according to claim 6 , wherein,
the scintillation crystal detector is made of an organic scintillation crystal of polystyrene.

10. The scintillation detector device according to claim 9 , wherein,
the organic scintillation crystal of polystyrene is doped with a wave-drifting material for wave-drifting of a high-energy photon generated by the organic scintillation crystal or the sensitizing screen to a wave band where the photoelectric multiplier is sensitive.

11. The scintillation detector device according to claim 10 , wherein,
the reflective layer is made of an aluminum foil material.

12. The scintillation detector device according to claim 10 , wherein,
the light shielding layer is made of a black packaging material.

13. The scintillation detector device according to claim 12 , wherein,
the black packaging material comprises a black PET film.

14. The scintillation detector device according to claim 10 , wherein,
the wave-drifting material comprises Bis-MSB.

15. The scintillation detector device according to claim 10 , wherein,
the at least part of X-ray incident to the scintillation crystal detector is interacted with the scintillation crystal in the scintillation crystal detector to be converted into a light signal.

16. The scintillation detector device according to claim 10 , wherein,
a part of backscattered X-ray from the object to be detected is interacted with the X-ray sensitizing screen to be converted into a light signal and, after have been light-guided by the scintillation crystal in the scintillation crystal detector, is passed to and collected by the photoelectric multiplier.

17. The scintillation detector device according to claim 16 , wherein,
the photoelectric multiplier is coupled to a back face or a side face of the scintillation crystal detector.

18. The scintillation detector device according to claim 3 , wherein,
the X-ray sensitizing screen is a rare earth sensitizing screen.

19. The scintillation detector device according to claim 18 , wherein,
the rare earth sensitizing screen is made from a gadolinium sulfide-oxide material.

20. The scintillation detector device according to claim 1 , wherein,
a part of backscattered X-ray from the object to be detected is interacted with the X-ray sensitizing screen and a part of the interacted X-ray is escaped and is interacted with the scintillation crystal in the scintillation crystal detector to be converted into a light signal.

Assignees

• Nuctech Co Ltd
• Univ Tsinghua

Inventors

• Zhao Ziran
• Chen Zhiqiang
• Li Yuanjing
• Wu Wanlong
• Liu Yinong
• Ruan Ming
• Jin Yingkang
• Tang Le

Classifications

• G01T1/2008 Primary

  using a combination of different types of scintillation detectors, e.g. phoswich · CPC title

• G01T1/2002 Primary

  Optical details, e.g. reflecting or diffusing layers · CPC title