Physics – Instrumentation and Detectors
Scientific paper
2006-05-30
Nucl.Instrum.Meth.A607:432-438,2009
Physics
Instrumentation and Detectors
Scientific paper
10.1016/j.nima.2009.02.019
It is a familiar fact that the total measured light yield of NaI (Tl) detectors is a nonlinear function of temperature. Here we present new experimental data for the temperature behavior of doped NaI(Tl) scintillators that instead shows a linear dependence of light output over a wide temperature range- including that for outdoor applications. The shape of the light pulse shows in general two decay processes: a single dominant process above room temperature and two decay time constants below. We show that redistribution of the intensities is temperature-dependent; the second (slow) decay component is negligible at room temperatures, but, by -20C, it contributes up to 40 percents of the total light and has a duration of several microseconds. We discuss the profound effect this new understanding of the light output has on the pulse height analysis instrumentation. We introduce a theoretical model to explain the experimental results. In addition, we describe a unique technique for correcting both amplitude and shape temperature changes inside the NaI(Tl) detector package.
Alexandrov Boian S.
Browne M. C.
Ianakiev Kiril D.
Littlewood Peter B.
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