Abstract
In this study, a novel thermal neutron scintillator of Tl:CsI/LiBr was developed. The eutectics were fabricated at the various growth rate and investigated their scintillation properties. As a material design guideline, Tl:CsI, which has an excellent α/γ ratio, was selected as the scintillator phase to realize high light yield at the energy of α-rays and tritons generated by the nuclear transmutation reaction with <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sup> Li, and LiBr, which has a refractive index close to that of CsI, was selected as the neutron capture phase. Radioluminescence measurement under X-ray irradiation was also performed to obtain the emission spectrum of the eutectics. The light yield and decay time for thermal neutron were measured using <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">252</sup> Cf and were much higher than those of conventional scintillators for thermal neutron. Furthermore, fabricated eutectic can have the higher sensitivity to thermal neutron due to the high <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sup> Li concentration compared to conventional single crystal scintillators. Therefore, we have succeeded in developing a promising scintillator material.
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