Device and method for measuring flux of fast neutrons

Abstract

The invention discloses a device and method for measuring the flux of fast neutrons, and the method comprises the following steps: enabling the fast neutrons to be converted into secondary neutrons through employing a high-density polyethylene layer and a titanium layer; collecting secondary neutrons comprising characteristic X rays with the titanium energy 4.51keV; analyzing and processing collected signals; analyzing and displaying the flux of outgoing and incoming fast neutrons. A multichannel analyzer is used for receiving the neutrons and the secondary neutrons generated by the high-density polyethylene layer and the titanium layer, and the method measure the flux of fast neutrons through analyzing the number of the full-energy peaks of the characteristic X rays with the titanium energy 4.51keV in the obtained secondary neutrons. The method is high in measurement precision of the flux of neutrons.

Description

Technical field: [0001] The invention relates to a measuring device for fast neutron flux and a measuring method thereof, belonging to the technical field of neutron detection. Background technique: [0002] The measurement of neutron flux is of great significance to neutron logging technology, nuclear fission, nuclear fusion, prompt neutron activation technology, boron neutron capture therapy and other fields. Neutrons are electrically neutral, so neutrons are indirect ionizing radiation particles. When they pass through matter, they cannot transfer energy to extranuclear electrons through Coulomb interactions, so neutrons cannot directly cause ionization of matter. The ionization process of neutrons is through the interaction between neutrons and atomic nuclei to generate secondary charged particles that can cause ionization, and the secondary charged particles generate ionization in matter. According to energy, neutrons can be divided into slow neutrons (<1keV), mediu...

AI Technical Summary

Problems solved by technology

Helium 3 in the helium 3 proportional counter has a large reaction cross section for thermal neutrons, and the helium 3 proportional counter is relatively insensitive to photon radiation, but the reaction cross section of helium 3 and neutrons decreases rapidly with the increase of neutron energy , in addition, due to the insufficient supply of helium 3, the helium 3 proportional counter is not suitable for the measurement of fast neutron flux

Because plastic scintillators are rich in hydrogen atoms, they are widely used in the measurement of fast neutron flux. However, plastic scintillators are also sensitive to photon radiation, which makes it difficult to measure neutron flux with plastic scintillators.

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