Optical fiber coupling organic scintillating fiber pulse neutron probe

A technology of scintillation fiber and pulsed neutrons, which is applied in scintillation detector measurement and other directions, can solve the problems of inability to meet fast time response and low ability of strong anti-electromagnetic interference at the same time, to ensure coupling efficiency and joint strength, collimation and the effect of reducing shielding difficulty and solving direct sunlight interference

Inactive Publication Date: 2009-10-14
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

[0009] The purpose of the present invention is to provide a fiber-coupled organic scintillation fiber pulsed neutron detector, which solves the problem that the existing pulsed neutron dete

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  • Optical fiber coupling organic scintillating fiber pulse neutron probe
  • Optical fiber coupling organic scintillating fiber pulse neutron probe
  • Optical fiber coupling organic scintillating fiber pulse neutron probe

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Embodiment Construction

[0034] Schematic diagram of the response of organic scintillation fiber to neutron and gamma incident incident on the side. figure 1 As shown, the organic scintillation fibers have different response mechanisms to neutrons and gammas. In the neutron energy region of the MeV level, the response of scintillators to neutrons mainly comes from the response to recoil protons generated by the interaction between neutrons and hydrogen nuclei, and the response to gamma is through the photoelectric effect of gamma and matter, CommScope The response of the secondary electrons generated by the Dun effect and the electron pair effect is dominated by the Compton effect in the MeV energy range. For organic scintillation fibers with thinner diameters, recoil protons deposit most of their energy in the fibers, while secondary electrons deposit less energy inside the fibers due to passing through the fiber surface. According to theoretical simulations, the neutron sensitivity of organic scinti...

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Abstract

The invention relates to an optical fiber coupling organic scintillating fiber pulse neutron probe comprising a probe and a photoelectric converter, wherein the probe comprises a metal shell and a radiation sensitive unit positioned at a central position on the shell, the shell is provided with a probe incident window and a probe exit window along the beam incident direction, and the probe also comprises a light guide bundle used for connecting the probe and the photoelectric converter; the radiation sensitive unit is an organic scintillating fiber linear array formed by a single layer of organic scintillating fibers which are parallelly arranged, and the organic scintillating fiber linear array is arranged perpendicularly to the beam incident direction and fixed on the inner side wall of the metal shell; the light guide bundle is formed by a plurality of silica optical fibers which are bundled cables, and the silica optical fibers are coupled with the organic scintillating fibers one to one; and a light exit surface at the tail end of the light guide bundle is aligned with an incident window of the photoelectric converter. The optical fiber coupling organic scintillating fiber pulse neutron probe solves the technical problems that the existing pulse neutron probe cannot satisfy the requirements of fast response time, high n/gamma sensitivity ratio, strong anti-electromagnetic interference capability and low shield simultaneously, and has high n/gamma sensitivity ratio and strong anti-gamma interference capability.

Description

technical field [0001] The invention relates to a radiation detection device, in particular to a detector suitable for pulse neutron time spectrum (fission, fusion) measurement and absolute intensity measurement. Background technique [0002] The pulsed neutron radiation field is a mixed radiation field composed of pulsed neutrons, γ and electromagnetic pulses, etc. It has the characteristics of high intensity, wide dynamic range, and fast time. In addition to the requirements, there are outstanding difficulties in the following aspects: [0003] 1. Space distance limitation. Due to the certain distribution of neutron energy, there is a certain dispersion in the time when neutrons of different energies arrive at the measuring point, which is proportional to the distance. The position needs to be responded quickly; [0004] 2. Gamma interference. The detector responds to neutrons and gamma at the same time, which will bring some interference to neutron signal detection. The...

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Application Information

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IPC IPC(8): G01T3/06
Inventor 陈亮欧阳晓平张忠兵程淑英
Owner NORTHWEST INST OF NUCLEAR TECH
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