Temperature Dependence of Li-Glass Scintillator Response to Neutrons

A Li-glass scintillator was placed in the slow neutron eld at temperatures of 300 K and 77 K.An avalanche photodiode (APD) was employed for converting scintillation photons into voltage signal pulses.A peak corresponding to the Q-value of the 6 Li(n, α)T reaction appeared in both pulse height distributions obtained at temperatures of 300 K and 77 K.By using the relationship between the Compton-edge energy and the pulse height in response of the Li-glass scintillator to γ-rays radiated from 137 Cs, the values of the gamma equivalent energy of the thermal neutron peak were evaluated to be 1.60 ± 0.09 MeV and 1.16 ± 0.06 MeV at temperatures of 300 K and 77 K, respectively.For the Li-glass scintillator, the ratio of the light yield in thermal neutron detection to that in γ-ray detection was found to decrease with temperatures.