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Optical fiber coupled radiation detector used for fast neutron measurement

A radiation detector and fiber coupling technology, which is applied in the field of radiation measurement, can solve the problems of large size of the detector, poor environmental adaptability, and easy interference, and achieves the effects of strong environmental adaptability, small size and simple structure.

Inactive Publication Date: 2013-06-19
CHINA INST FOR RADIATION PROTECTION
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Problems solved by technology

The disadvantage is that the detector composed of scintillator and photomultiplier tube is large in size and poor in environmental adaptability. It is easily disturbed in harsh environments and the measurement data is unreliable.

Method used

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  • Optical fiber coupled radiation detector used for fast neutron measurement

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0014] like figure 1 As shown, the fiber-coupled radiation detector for fast neutron measurement provided by the present invention mainly includes a scintillation probe 1 composed of a fast neutron sensitive material and a scintillator, a transmission fiber 2 and a photoelectric sensitive device 3 . The detection principle is: using fast neutron-sensitive materials to react with fast neutrons, the reaction products interact with scintillators to emit scintillation light, and the scintillation light is transmitted to photoelectric sensitive devices through transmission optical fibers to obtain measurement signals.

[0015] With commonly used fast neutron sensitive materials ( 232 Th) as an example, fast neutrons and 232 Th reacts to generate two fission fragments with similar mass. The energy of each fission fragment reaches 40-110MeV. These reaction...

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Abstract

The invention relates to the radiometric technology and in particular to an optical fiber coupled radiation detector used for fast neutron measurement. The optical fiber coupled radiation detector used for the fast neutron measurement comprises a scintillation probe which is formed by blending of fast neutron sensitive materials and scintillating mediums, a transmission optical fiber and a photovoltaic sensitive component, wherein one end of the transmission optical fiber is inserted in the middle of the scintillation probe, the other end of the transmission optical fiber is connected with the photovoltaic sensitive component, and an optical wrapping layer of one part, arranged in the scintillation probe, of the transmission optical fiber is removed. The optical fiber coupled radiation detector used for the fast neutron measurement has the advantages of being simple in structure, small in size, strong in environment adaptability, capable of achieving on line real-time monitoring and the like, and can meet the demand of fast neutron measurement under complex and severe environment.

Description

technical field [0001] The invention relates to radiation measurement technology, in particular to a fiber-coupled radiation detector for fast neutron measurement. Background technique [0002] Neutrons have no electric charge, so detection of neutrons must be done with the help of secondary charged particles produced by the interaction of neutrons with atomic nuclei. The methods usually used for neutron detection are nuclear reaction method, nuclear recoil method, nuclear fission method and nuclear activation method. According to the working mechanism of the detector, it can be divided into gas ionization detector, semiconductor detector, scintillation detector and so on. Nuclear recoil fast neutron scintillation detectors include ZnS fast neutron screens, plastic scintillators, etc. Nuclides with fission thresholds, such as 232 Th(1.3MeV), 234 U(0.4MeV), 238 U (1.4MeV), etc., can constitute a nuclear fission neutron detector for fast neutron measurement. [0003] In ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T3/06
Inventor 刘立业马吉增潘红娟曹勤剑陈宝维肖运实熊万春赵原卫晓峰金月如郭英蕾李阳
Owner CHINA INST FOR RADIATION PROTECTION
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