Gate type radioactivity monitoring and identification system

An identification system and radioactive technology, applied in the field of monitoring and identification, can solve the problems of increased installation, transportation, maintenance, low detection sensitivity, and small volume, and achieve the effect of improving security inspection efficiency, high detection sensitivity, and high detection efficiency.

Pending Publication Date: 2018-12-21
THE FIRST RES INST OF MIN OF PUBLIC SECURITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, neutron detectors usually use 3 He or 10 BF 3 Gas detectors require a relatively large area to accommodate gaseous components, which adds a lot of problems and costs to the installation, transportation, and maintenance of the system, especially 3 He gas is a scarce resource, the price is very expensive, and the price has been increasing in recent years, and there are many restrictions on obtaining this gas
Later it was proposed to adopt 6 LiI(Eu) scintillation crystal detects neutrons, but the volume of the crystal is not large, the common maximum volume is Φ5cm×5cm, and the detection sensitivity is relatively low

Method used

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  • Gate type radioactivity monitoring and identification system
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  • Gate type radioactivity monitoring and identification system

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Experimental program
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Embodiment 1

[0034] This embodiment discloses a door-type radiation monitoring and identification system, such as Figure 1-3 As shown, it includes a portal frame 1, and the portal frame 1 is provided with a gamma detector 6, a neutron detector 7, a nuclide identification detector 8, an alarm device, a power supply 14 and a main control board 13; The nuclide identification detector 8 is detachably fixed to the door frame 1; the gamma detector 6, neutron detector 7, nuclide identification detector 8 and alarm device are all electrically connected to the main control board 13 ; The power supply 14 is electrically connected to the main control board 13 .

[0035] In the above-mentioned portal radioactivity monitoring and identification system, the combination of gamma detector and nuclide identification detector is adopted, on the one hand, it solves the problem of low gamma detection sensitivity when the nuclide identification detector is used alone, on the other hand, it solves the problem ...

Embodiment 2

[0067] The portal radiation monitoring and identification system of this embodiment is basically the same as that of Embodiment 1. In this embodiment, the portal frame of the portal radiation monitoring and identification system is 2000 mm high and 1000 mm wide inside. The first column and the second Two gamma detectors are respectively installed in the column, and the gamma detection crystal is a plastic scintillator, and the size of the plastic scintillator is: 700mm*200mm*50mm. A neutron detector is respectively installed in the first column and the second column, and the neutron detection crystal is 6 LiF / ZnS: Ag scintillation crystal, the crystal size is: 500mm*200mm*50mm; a nuclide identification detector is installed in the second column, the detection crystal is sodium iodide, and the size of sodium iodide is 75mm in diameter and 200mm in length.

Embodiment 3

[0069] The portal radiation monitoring and identification system of this embodiment is basically the same as that of Embodiment 1, the main difference being that in the portal radiation monitoring and identification system of this embodiment, a gamma detector is respectively installed in the first column and the second column.

[0070] The portal frame of the portal radiation monitoring and identification system in this embodiment has a height of 2000 mm and an inner width of 1000 mm. The gamma detection crystal is a plastic scintillator, and the size of the plastic scintillator is: 90mm*200mm*50mm. A neutron detector is respectively installed in the first column and the second column, and the neutron detection crystal is 6 LiF / ZnS: Ag scintillation crystal, the crystal size is: 450mm*250mm*50mm, a nuclide identification detector is installed in the second column, the detection crystal is sodium iodide, and the size of sodium iodide is 50mm in diameter and 200mm in length.

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Abstract

The invention discloses a gate type radioactivity monitoring and identification system, comprising a portal frame, wherein a gamma detector, a neutron detector, a nuclide identification detector, an alarm device, a power supply and a main control board are arranged on the portal frame; the nuclide identification detector is detachably fixed to the portal frame; the gamma detector, the neutron detector, the nuclide identification detector and the alarm device are electrically connected to the main control board; and the power supply is electrically connected to the main control board. The gatetype radioactivity monitoring and identification system disclosed by the invention can simultaneously monitor radioactive substances of radiation neutron rays and gamma rays and can perform nuclide identification, and the nuclide identification detector can be switched between fixed detection and hand-held detection for use according to onsite requirements.

Description

technical field [0001] The invention relates to the technical field of monitoring and identification, in particular to a portal type radiation monitoring and identification system. Background technique [0002] Radioactive substances can emit radiation with strong penetrating power. Improper use will cause radioactive pollution and endanger human health and safety. Preventing the illegal transfer of nuclear materials or other radioactive substances is of great significance to ensuring the safety of the country and the public. At present, judging whether the object under inspection carries radioactive substances is mainly judged by detecting the gamma rays and neutron rays emitted by the radioactive substances. [0003] Gamma detectors typically use plastic scintillators or sodium iodide. Plastic scintillators are cheap, have a wide energy spectrum, and can be made relatively large, so they have relatively high detection sensitivity for radioactive substances, but they canno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/02G01T1/167G01T1/203G01T1/38G01T3/06
CPCG01T1/023G01T1/167G01T1/203G01T1/38G01T3/06
Inventor 曹琴琴史运锋郭双茂于海辉张庆胜金川吴建义杜菲郑海东任艺
Owner THE FIRST RES INST OF MIN OF PUBLIC SECURITY
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