Continuous neutron spectrum real-time detection system

A real-time detection and neutron technology, applied in the measurement of neutron radiation, measurement devices, radiation measurement, etc., can solve the problems of inconvenient sub-spectrum, large volume, and many detector systems, and achieve simple electronic circuits, Precise neutron spectrum, easy to use effect

Inactive Publication Date: 2013-01-09
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

The disadvantage of the Bonner multi-sphere system is: the Bonner multi-sphere system detector system (the number of balls) is large, and the whole set of multi-sphere system is relatively large, and it is very inconvenient to measure the sub-spectrum in the outdoor environment.
And because the Bonner multi-sphere system is composed o

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  • Continuous neutron spectrum real-time detection system
  • Continuous neutron spectrum real-time detection system
  • Continuous neutron spectrum real-time detection system

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Embodiment Construction

[0024] Such as figure 1 , 2 , 3, and 4, the embodiment of the present invention comprises: seven layers of spherical shell-shaped polyethylene moderator layers 9-15, eight-layer spherical shell-shaped thermal neutron detector systems 1-8, the nuclear electronics system at the bottom 16, indicator lights 17-19, and computer system. First install the innermost spherical shell-shaped thermal neutron detector system 8, process two cadmium plates with a thickness greater than 0.1mm into a spherical shell shape, and the radius difference between the two concentric spherical shells with different radii is the spherical shell-shaped thermal neutron The distance between the two polar plates of the detector layer is about 0.5 to 10 cm, and the gas of 1 to 8 atmospheres is filled at 25 between the two polar plates. 3 He gas and sealed, the outer plate (cathode) 24 is grounded, the inner plate is connected to 500V positive high voltage, and the inner plate is used as the collector (high...

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Abstract

A continuous neutron spectrum real-time detection system comprises a plurality of spherical-shell polyethylene moderation layers, a plurality of spherical-shell thermal-neutron detector systems, an electronics system, a computer system, an input power supply interface, a signal output interface, a display panel and a switch; and after neutrons with different energies enter the detection system, the neutrons are moderated by different moderation layers to thermal neutrons to be finally detected by the detector system of one layer, a pulse signal is transmitted to the electronics system, the electronics system analyzes and outputs relevant signals according to signals inputted by different detection layers, finally the computer system outputs a corresponding energy value according to different signals outputted by the electronics system and draws and records an energy spectrum. The continuous neutron spectrum real-time detection system is small in size and capable of precisely measuring neutron energy spectrum on one position.

Description

technical field [0001] The invention relates to a continuous neutron energy spectrum real-time detection system which can be used for neutron measurement in experimental sites and environments. Background technique [0002] With the development of neutron physics, aerospace, reactor, accelerator technology, radiation protection and environmental protection, the real-time measurement of neutron spectrum is particularly important. [0003] Neutrons are neutral and uncharged, and cannot directly cause ionization of matter when passing through matter, so they cannot be directly detected. The measurement of neutrons is carried out indirectly through the charged particles produced by its interaction with other nucleons. Generally, there are four methods: nuclear reaction method, nuclear recoil method, nuclear fission method and activation method. When using the nuclear reaction method to measure neutrons, select 3 He is used as a detection gas because 3 He reacts with thermal n...

Claims

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Application Information

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IPC IPC(8): G01T3/00
Inventor 郭倩李贵祝庆军吴宜灿
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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