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Fusion neutron flux monitor

A technology of fusion neutrons and monitors, which is applied in the measurement of neutron radiation, instruments, measuring devices, etc. It can solve the problems that the measurement accuracy and measurement range cannot meet the needs of fusion neutron measurement, achieve good performance and expand the range and dynamic range, the effect of ensuring accuracy

Active Publication Date: 2007-04-04
SOUTHWESTERN INST OF PHYSICS
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Problems solved by technology

Since there is no such powerful high-energy neutron source as the International Thermonuclear Experimental Reactor (ITER) in the world, there is no corresponding such powerful neutron flux monitor, and the existing neutron fl

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  • Fusion neutron flux monitor

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Embodiment Construction

[0011] As shown in Figure 1, the fusion neutron flux monitor is composed of three fission chamber detectors 3, 4, 5 placed in the stainless steel casing 1, wherein the cathodes of the two fission chamber detectors 4, 5 are coated with High-purity fissile materials of different qualities have different sensitivities. According to the dynamic range required by the measurement, technical conditions, and reasons for calibration, the present invention makes the sensitivity of the two detectors 1 by changing the quality of the fissile materials. : 100. The third fission chamber detector 3 is a "blank" detector without fissile material, and its geometric size, material, working gas and electronics are all identical to the other two fission chamber detectors. A cadmium thermal neutron shielding layer 6 with a thickness of 1mm is arranged inside the stainless steel shell 1, and a neutron moderator structure 7 is arranged inside the cadmium thermal neutron shielding layer 6, and a lead ...

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Abstract

A monitor of fusion neutron flux is formed by three fission chamber detectors set in stainless steel shell. It is featured as coating different mass of high purified fission material on cathodes of two fission chamber detectors make their sensitivity be 1: 100, setting the third fission chamber detector to be blank detector with no fission material, setting a layer of Cd-heat neutron shielding layer with neutron moderator structure in shell, setting lead shielding layer in neutron moderator structure and placing three fission chamber detectors in lead shielding layer.

Description

technical field [0001] The invention relates to a detector for fusion neutron measurement in a fusion reactor. Background technique [0002] In the field of neutron measurements, fission chamber detectors have been widely used, but only for low-flux or medium-flux neutron sources. Fission reactors are currently the strongest source of neutrons, but the main components are thermal neutrons or epithermal neutrons, so the neutron flux leaked out of the core is far lower than the high-energy ( 2.45 or 14.5 MeV) neutron flux. Therefore, it is necessary to develop the largest dynamic range, the widest measurement range, and the highest measurement accuracy so far, which can cover the maximum neutron production of the International Thermonuclear Experimental Reactor (ITER) (10 21 / s) fusion neutron flux monitor. Since there is no such powerful high-energy neutron source as the International Thermonuclear Experimental Reactor (ITER) in the world, there is no corresponding such po...

Claims

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Application Information

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IPC IPC(8): G01T3/00
Inventor 杨进蔚肖功珊宋先瑛
Owner SOUTHWESTERN INST OF PHYSICS
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