Improved structure of scintillation detector in neutron activation environment

Abstract

The invention discloses an improved structure of a scintillation detector in a neutron activation environment, wherein the improved structure of the scintillation detector is suitable for high-energy gamma-ray measurement. According to the principle of the detector, the energy of a gamma-ray generated by neutron activation is generally 1 to10 MeV; after the ray enters a crystal (5), the electron-pair effect and Compton reaction are produced to generate photoelectrons; high-energy electrons and photons are easy to escape out of a scintillator; the escaped photons are reflected back into the crystal (5) through a reflecting layer (3); a magnetic field provided by a solenoid (2) binds the escaped high-energy electrons back to the crystal (5) by the action of the Lorentz force, and energy is deposited in the crystal; and the photon yield is increased. The improved scintillation detector has the advantages of high measured energy spectrum resolution and high detection efficiency, and has a high practical value in high-precision nuclear spectroscopy measurement such as neutron activation elemental analysis.

Description

technical field [0001] The invention belongs to the field of nuclear radiation detectors. An improved structure of a scintillation detector in a neutron activation environment is applied to the energy spectrum measurement of higher energy gamma rays generated in a neutron activation environment, and more energy can be obtained in a neutron activation environment. The gamma energy spectrum with good resolution and higher detection efficiency has high practical value in high-precision nuclear spectroscopy measurements such as neutron-activated elemental analysis. Background technique [0002] The scintillator detector is composed of three main parts: scintillator, photomultiplier tube and corresponding electronic system. After the rays enter the scintillator, secondary electrons are generated inside the scintillation crystal to ionize and excite the scintillator molecules, and a large number of photons are emitted when de-exciting. The photomultiplier tube is composed of a ph...

AI Technical Summary

Problems solved by technology

When the ray enters the crystal, the electron pair effect and a small amount of Compton reaction generate photoelectrons near the surface of the incident end of the crystal. The electron energy generated by the electron pair effect is above 511keV, and a large number of high-energy electrons generated on the surface will escape to the scintillator. The energy deposited in the crystal will be greatly reduced, resulting in a reduction in the number of photons eventually generated, so the performance of the detector such as resolution and detection efficiency will be reduced

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