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Real-time monitoring device for neutron flux in fission reaction

A real-time monitoring and fission reaction technology, which is applied in the monitoring of nuclear reactors, reactors, and measurement with scintillation detectors.

Active Publication Date: 2015-03-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, under certain experimental device conditions, due to the influence of the measurement environment or the intensity of the neutron source, the mature time-of-flight method has certain limitations, especially in close-range measurements, the resolution of n and γ has become a difficult problem

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  • Real-time monitoring device for neutron flux in fission reaction

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Embodiment Construction

[0026] The technical solutions of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] refer to figure 1, in the fission reaction neutron flux real-time monitoring device of the present invention, the fast neutron converter 1 is connected with the detector shell 17 to form a closed space, and the fast neutron converter 1 is used for reacting with fast neutrons to increase the rate of fast neutrons. Detection efficiency, the detector housing 17 is used to prevent scattered neutrons and photons from entering the detector; boron-containing plastic scintillator 2, fluorescent reflection tube 3, fluorescent light guide 6, first photomultiplier tube (PMT1) 7, Cherenkov The radiator 4, the Cherenkov light reflection tube 5, the Cherenkov light guide 8, and the second photomultiplier tube (PMT2) 9 are all arranged in the closed space formed by the fast neutron converter 1 and the detector housi...

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Abstract

The invention discloses a real-time monitoring device for the neutron flux in a fission reaction. The device is characterized in that a fast neutron conversion body (1), a fluorescent light reflection tube (3), a boron plastic flash body (2), a Cherenkov light reflection tube (5) and a Cherenkov radiation body (4) are arranged in the incident direction of particles in sequence; neutrons and gamma rays enter the boron plastic flash body (2) to interact with substances to generate e+ / e-, recoil protons and alpha particles, the e+ / e-, the recoil protons and the alpha particles are excited to generate fluorescent light, and the fluorescent light enters a first photoelectric multiplier tube (7) through reflection of the fluorescent light reflection tube (3) and is amplified through an amplifier (10) to obtain neutron and gamma information; after secondary particles enter the Cherenkov radiation body, only e+ / e- generates Cherenkov light, and the Cherenkov light is amplified through a second photoelectric multiplier tube to obtain gamma information; two signals are subjected to subtraction to obtain neutron flux information. According to the device, the n and gamma signals are judged in combination with the pulse rise time difference, so that the measurement precision of the pulsed neutron flux is further improved.

Description

technical field [0001] The invention belongs to the technical field of neutron detection, and relates to a device for measuring the neutron flux value of fission reaction, in particular to a real-time monitoring device for neutron flux of fission reaction. Background technique [0002] Neutrons are electrically neutral, and they are not blocked by Coulomb barriers when interacting with nuclei, which allows neutrons of almost any energy to react with any nuclides. In many fields of nuclear technology, neutrons have a very wide range of applications. Since the discovery that neutrons can cause heavy nuclear fission in 1938, a new field of energy research-nuclear energy has been opened up. With the rapid development of nuclear energy and the gradual shift from national defense to civilian use, fission nuclear reactors have been widely developed and applied in many countries and regions. Compared with traditional energy sources, nuclear energy has many advantages, and as a new...

Claims

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Application Information

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IPC IPC(8): G21C17/10G01T3/06
CPCG01T3/06G21C17/10G21C17/108Y02E30/30
Inventor 单卿褚胜男贾文宝
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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