Neutron detector based on polyethylene combined gas scintillator

Abstract

The invention relates to a neutron detector based on a polyethylene combined gas scintillator. The neutron detector comprises a cylinder body, an incidence window, an emergence window, a first conversion target, a second conversion target, a quartz window, a photoelectric detector, a sleeve, a gas-filling device and a scintillation gas, wherein the incidence window is hermetically arranged on the front end face of the cylinder body; the emergence window is hermetically arranged on the rear end face of the cylinder body; the first conversion target and the second conversion target are arranged on the inner side of the incidence window sequentially; the quartz window is arranged on the side of the cylinder body; the photoelectric detector is arranged outside the quartz window; the sleeve is used for connecting the photoelectric detector with the cylinder body; the gas-filling device is communicated with the cylinder body; and the scintillation gas is filled in the cylinder body. The invention aims to provide the neutron detector based on the polyethylene combined gas scintillator, which can measure the neutron injection quantity in a low-intensity neutron / gamma mixed radiation field. The detector has flat response on the energy of neutron of 1 to 15 MeV and has high resolving property on fast neutron / gamma.

Description

technical field [0001] The invention relates to a detector for measuring the neutron fluence rate in a low-intensity pulsed neutron / gamma mixed radiation field, in particular to a detector using neutrons and polyethylene, 4 The recoil protons and recoil produced by He gas reaction 4 He nuclear excitation 4 The principle of He gas luminescence is used to realize the detector for fast neutron detection. Background technique [0002] The low-intensity neutron / gamma mixed radiation field has the following characteristics: low neutron intensity, wide range of neutron energy distribution, and the radiation intensity of gamma rays is at the same level as the neutron intensity. Mixed low-intensity neutron / gamma radiation fields include fission reactors, Am-Be neutron sources, 252 Cf neutron source, etc. Therefore, it is difficult to measure the fast neutron fluence in this radiation field. In order to measure the neutron fluence more accurately in the neutron / gamma mixed radiati...

AI Technical Summary

Problems solved by technology

However, since the luminous efficiency of electrons in films and fibers is higher than that of protons, the energy deposition of neutrons only depends on 1 The neutron scattering cross section of H, so the neutron / gamma resolution of scintillation film detectors and scintillation fiber detectors is not high, it is difficult to be greater than 10 times, and their energy response to fast neutrons is not very flat

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