Optical refractive index change-based ultra-wideband neutron detector

Abstract

The invention discloses an optical refractive index change-based ultra-wideband neutron detector and belongs to the technical field of nuclear radiation detection. The optical refractive index change-based ultra-wideband neutron detector comprises a detection unit composed of a hydrocarbon material layer, a cesium iodide layer, a semiconductor and a substrate which are sequentially fixed, a high-voltage power supply and a neutron beam. A first metal film and a second metal film are respectively electroplated on the outer surface of the hydrocarbon material layer and the outer surface of the substrate. The first metal film is electrically connected with the negative electrode of the high-voltage power supply. After the neutron beam is incident on the detection unit, neutrons collide with protons in the hydrocarbon material layer to generate back-flushing protons. The back-flushing protons enter the cesium iodide layer to generate free electrons. Under the electric field action of a negative high voltage between the first metal film and the second metal film, generated free electrons in the cesium iodide layer are injected into the semiconductor, so that the optical refractive indexof the semiconductor is changed. The detector can convert the neutron beam into the refractive index change of the semiconductor material. Based on the optical interference, the refractive index change of the semiconductor material is measured, and then the intensity information of the neutron beam is obtained.

Description

technical field [0001] The invention belongs to the technical field of nuclear radiation detection, and in particular relates to an ultra-broadband neutron detector based on optical refractive index changes. Background technique [0002] Neutron detection is one of the important research contents in the field of nuclear radiation detection. The traditional neutronics detection method is to use the detection material to interact with the neutron beam to generate free electrons, and to collect these free electrons to generate current or voltage for detection. This method is based on the electronic detection system. For pulsed neutron beam detection, during the process of excitation, generation of pulse current or voltage, and transmission, the high-frequency components in the pulse current or voltage signal will be limited by the bandwidth of the electronic detection system, resulting in signal High-frequency components are attenuated or even lost, which severely limits the t...

AI Technical Summary

Problems solved by technology

This method is based on the electronic detection system. For pulsed neutron beam detection, during the process of excitation, generation of pulse current or voltage, and transmission, the high-frequency components in the pulse current or voltage signal will be limited by the bandwidth of the electronic detection system, resulting in signal High-frequency components are attenuated or even lost, which severely limits the time resolution capability of the detection system

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