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Channel type radioactive detector with low detection limit

A channel-type, radioactive technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve problems such as inability to effectively detect low-energy nuclides, fail to meet measurement requirements well, poor energy response of low-energy rays, etc., and reduce the lower limit of energy detection , Improve detection efficiency and sensitivity, reduce background effect

Active Publication Date: 2013-08-28
上海新漫传感科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a channel-type radioactive detector with a low detection limit for a channel-type radioactivity monitoring system, which is used to solve the uneven light collection in the plastic scintillator detector of the existing channel-type radioactive monitoring system, The detection efficiency is reduced, the energy response to low-energy rays is poor, the low-energy nuclides cannot be effectively detected, and the measurement requirements cannot be well met

Method used

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Embodiment 1

[0035]In this embodiment, the shell 1 is made of 3mm aluminum, the shield 2 is made of 10mm lead, the plastic scintillator 3 is EJ200 plastic scintillator, the size is 1000mm×500mm×50mm, the two ends of the plastic scintillator 3 They are respectively coupled with the first photomultiplier tube 4 and the second photomultiplier tube 6 through light guides. Both the first photomultiplier tube 4 and the second photomultiplier tube 6 are Beijing Hamamatsu CR135 photomultiplier tubes, the photocathode quantum efficiency of the double multiplier tubes is matched, and the gain is basically the same.

[0036] According to the above-mentioned design scheme, a corresponding low-detection-limit channel-type radioactive detector is formed, and through corresponding experimental measurements, in 137 Under the Cs source, the sensitivity is 60% higher than that of single-channel signal acquisition, and it can detect radiation 3nSv / h higher than the background, and the energy range is 25keV-3...

Embodiment 2

[0038] In this embodiment, the housing 1 is made of 2mm aluminum, the shielding body 2 is made of 20mm lead, the plastic scintillator 3 is a BC408 plastic scintillator with a size of 1200mm×600mm×50mm, and the two ends of the plastic scintillator 3 are respectively Coupled with the first photomultiplier tube 4 and the second photomultiplier tube 6 through the light guide. Both the first photomultiplier tube 4 and the second photomultiplier tube 6 are PHOTONIS XP5500 photomultiplier tubes, the photocathode quantum efficiency of the double multiplier tubes is matched, and the gain is basically the same.

[0039] According to the above-mentioned design scheme, a corresponding low-detection-limit channel-type radioactive detector is formed, and through corresponding experimental measurements, in 137 Under the Cs source, the sensitivity is 70% higher than that of single-channel signal acquisition, and it can detect radiation 2nSv / h higher than the background, and the energy range i...

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Abstract

The invention discloses a channel type radioactive detector with a low detection limit, which is used for a channel type radioactive monitoring system. The channel type radioactive detector comprises a shell, a shielding body arranged in the shell, a plastic scintillator, a first photomultiplier, a first preamplifier, a second photomultiplier, a second preamplifier, a signal processing and controlling unit. Two ends of the plastic scintillator are coupled with two photomultipliers through light guides to output two paths of pulse signals. The signal processing and controlling unit is internally provided with an adder circuit and an accordance circuit, which are used for adding two paths of the pulse signals to detect whether the pulse signals accord with requirements. In the invention, through a signal adding and accordance method and the shielding by using a lead shielding body, the cost can be effectively reduced, the noise is reduced, the signal to noise ratio is improved, the detection efficiency and the sensitivity are improved, and the energy detection lower limit is reduced, so that low-energy nuclides can be more effectively detected and measurement requirements are better met.

Description

technical field [0001] The invention relates to a radiation measuring device, in particular to a channel-type radioactive detector with a low detection lower limit. Background technique [0002] Due to special safety requirements for radioactive substances, possible radioactive substances in vehicles, pedestrians, and luggage must be detected. Channel-type radioactivity monitoring system is used to detect radioactive substances in vehicles, pedestrians, luggage, etc., and it has been more and more widely used at present. The existing channel-type radiation monitoring system consists of at least two oppositely placed detectors, an electronic system, various sensors and ancillary devices. When radioactive substances pass through, the emitted rays cause abnormal changes in the count rate of the system, thereby judging whether the object to be inspected contains radioactive substances. [0003] Two scintillator detectors are commonly used in radioactivity detection, one is pla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/203G01T7/00
Inventor 赵文渊宋建安李兆龙徐强尹旺明陈永林
Owner 上海新漫传感科技有限公司
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