Real-time monitoring device for neutron flux in fission reaction

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...

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