Fast neutron detector resisting interference of strong gamma rays and application method thereof

Abstract

The invention discloses a fast neutron detector resisting interference of strong gamma rays, comprising a piece of circular quartz glass, a visible light shielding cover, a micro channel plate, a liquid scintillator, a cavity for packaging the liquid scintillator, a signal input port, a signal output port, a power port, a gating circuit board, and a high-voltage power supply. The cavity is composed of a cylindrical cavity and a conical cavity connected together. The conical end of the conical cavity is provided with a circular window which is sealed by the circular quartz glass. According to the invention, the liquid scintillator is put in the cavity as a response medium, and the liquid scintillator which is of fast response and low persistence can greatly restrain persistence produced by gamma radiation. A gating circuit on the gating circuit board controls the opening time of the circular micro channel plate according to the actual situation in order to avoid the interference of strong gamma rays. The problem that strong gamma radiation signals interfere with fast neutron signals is solved.

Description

technical field [0001] The invention relates to the field of fast neutron detection, in particular to a fast neutron detector resistant to strong gamma ray interference and an application method thereof. Background technique [0002] For half a century, how to use the energy released by thermonuclear fusion to solve energy problems has been the goal pursued by mankind. At present, inertial confinement fusion is considered as a possible way to realize controllable fusion (written by International Atomic Energy Agency, edited by W.J.Hogan, "Inertial Fusion Energy" published in 1995). Different from fission reaction, inertial confinement fusion usually uses elements with low atomic number as fuel, which requires multiple channels of high-energy intense laser ablation and compression of the fuel to reach a high-temperature and high-density state, and then realize thermonuclear fusion to release fusion energy. At present, the United States, Japan, Russia, and the European Union ...

AI Technical Summary

Problems solved by technology

[0004] However, as the laser intensity continues to increase, especially when the power reaches petawatts (10 15 watts) of the super-powerful laser device, the gamma radiation produced in the inertial confinement fusion experiment has high energy and high intensity. Such gamma radiation will produce a strong afterglow interference signal in the plastic scintillator, and it lasts for hundreds of nanometers Seconds, superimposed on the fast neutron signal, or even submerge the fast neutron signal, which seriously interferes with the acquisition of effective neutron signals. In this case, the use of plastic scintillator neutron detectors cannot normally obtain the neutron time-of-flight spectrum and neutron yield

In summary, the use of plastic scintillators cannot suppress the afterglow of strong gamma rays, and the signal of strong gamma rays interferes with the signal of fast neutrons

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