Improved structure of scintillation detector in neutron activation environment

A scintillation detector and environmental technology, applied in the field of nuclear radiation detectors, can solve the problems of detector resolution and detection efficiency performance reduction, photon number reduction, etc., and achieve high practical value, good resolution, and high detection efficiency Effect

Inactive Publication Date: 2017-12-22
JILIN UNIV
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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 electr

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  • Improved structure of scintillation detector in neutron activation environment
  • Improved structure of scintillation detector in neutron activation environment
  • Improved structure of scintillation detector in neutron activation environment

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Embodiment 1

[0018] An improved structure of a scintillation detector in a neutron-activated environment such as figure 1 , figure 2 shown. The crystal (5) is wrapped with a reflective layer (3) on the side of a cylinder, and the inner side of the reflective layer (3) is polytetrafluoroethylene coated with barium sulfate. There are two protruding rings (7) inside the reflection layer (3) so that there is an air layer between the reflection layer and the crystal, and the outside of the reflection layer (3) is surrounded by a solenoid (2). There is a thin metal shell (4) at the front end of the detector as a front cover to protect the internal structure, and the main crystal passes through the anti-reflection film (6), optical coupling agent (8), quartz glass window (9), light guide (10) and electronic components of the crystal. Learning system (19) is connected. The whole system is placed in a cylindrical metal sleeve (1). There is a metal back cover (14) at the back end of the detector...

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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...

Claims

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Application Information

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IPC IPC(8): G01T1/36
CPCG01T1/362
Inventor 黑进国陆景彬许旭吕翌丰
Owner JILIN UNIV
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