Study On 4H-SiC SBD Neutron Detector

As one of the most important basic particles in the atomic nucleus, neutron is electrically neutral is widely used in industry, technology, materials, resources and other aspects and it can damage the instruments and human body. The research in the field of nuclear explosion detection, nuclear material detection, nuclear power plant safety monitoring, accelerator operation place, aviation and space, environmental monitoring, space physics and industrial applications has received much attention.For this reason, it is of great significance to detect neutrons in the field of nuclear power plant safety monitoring and nuclear material monitoring and space physics. The basic nuclear detector detect particles is based on the interaction between electricity and magnetism, however, to detect neutron one needs to detect the charged particles indirectly for no charge with neutron, and no the nucleus Coulomb force, cannot ionize or excite the atoms, so neutron difference in alpha, beta and other charged particles detection, cannot directly be detected.Nuclear reaction and nuclear recoil method are commonly used to detect neutron as well as nuclear fission and nuclear activation method. And nuclear reaction method is commonly used to detect slow neutron, while fast neutron commonly by nuclear recoil detection.Conventional semiconductor materials perform well in the general environment, but the performance of the traditional neutron detector will deteriorate in the condition with high temperature and strong radiation, and it can not work reliably.Compared with the first and two generation semiconductor materials, the third generation of compound semiconductor Si C materials have the outstanding advantages of high band gap, good thermal stability, high thermal stability, high thermal conductivity and anti irradiation ability. It is the preferred material that can be prepared and studied by high frequency, high temperature and anti radiation. The Si C based neutron detector has become a hot spot in the field of high temperature and strong radiation.In this paper, firstly, the method of neutron detection and the development of neutron detector are briefly introduced and the principle and advantages and disadvantages of the method are summarized. Secondly, the basic properties of Si C materials and the development of Si C neutron detector are introduced. The 4H-Si C is a preferred material for the production of high temperature and radiation resistance and domestic research lags behind the research of developed countries.Based on the principle of SBD, the sensitivity of the 6Li F conversion layer to the thermal neutron and the average range of the alpha particles and 3H particles in the Si C material are considered. the SBD 4H-Si C neutron irradiation detector is designed.Finally, The angular distribution spectra of alpha particles and 3H particles after 6Li F(n, ?)3H reaction were simulated, and the characteristics of the current pulse response cause by alpha particles and 3H particles were analyzed respectively. The characteristics of current pulse response cause by the incident alpha particles and 3H particles under the influence of energy, voltage, temperature, and incident angle are obtained. SBD 4H-Si C neutron detector is also summarized in the thermal neutron current pulse height spectra, and it is found that the pulse height at the low pass phase is caused by the alpha particles, and the pulse height of the high channel number is caused by the 3H particles. We can see that the simulation results and the experimental results have the same trend, the alpha particle current pulse peak and the 3H particle current pulse peak are close to the relative position of the peak and the peak position.Due to the shortage of the simulation accuracy, the simulation results are in the gap between the experimental results and the experimental results.