Branching transport model of Nal(T1) alkali-halide scintillator

摘要

We measure the time dependence of the scintillator light-emission pulses in Nal(T1) crystals at different temperatures, after activation by gamma rays. We confirm that there are two main nonexponential components to the time decay and find that their amplitude ratio shows Arrhenius temperature dependence. We explain these nonexponential components as arising from two competing mechanisms of carrier transport to the T1 activation levels. The total light output of the Nal(T1) detectors shows a linear temperature dependence explained by our model.