Design and spectrum calculation of 4H-SiC thermal neutron detectors using FLUKA and TCAD
SiC is a promising material for neutron detection in a harsh environment due to
its wide band gap, high displacement threshold energy and high thermal
conductivity. To increase the detection efficiency of SiC, a converter such as
6LiF or 10B is introduced. In this paper, pulse-height
spectra of a PIN diode with a 6LiF conversion layer exposed to
thermal neutrons (0.026 eV) are calculated using TCAD and Monte Carlo
simulations. First, the conversion efficiency of a thermal neutron with respect
to the thickness of 6LiF was calculated by using a FLUKA code, and a
maximal efficiency of approximately 5% was achieved. Next, the energy
distributions of both 3H and α induced by the
6LiF reaction according to different ranges of emission angle are
analyzed. Subsequently, transient pulses generated by the bombardment of single
3H or α-particles are calculated. Finally, pulse height
spectra are obtained with a detector efficiency of 4.53%. Comparisons of the
simulated result with the experimental data are also presented, and the
calculated spectrum shows an acceptable similarity to the experimental data.
This work would be useful for radiation-sensing applications, especially for SiC
detector design.
Keywords: 4H-SiC; Thermal neutron detector; Simulation; Pulse height spectra
Source: Sciencedirect
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