Speaker
Description
Scintillators that are capable of detecting both neutron and gamma-ray have
received much attention in recent years. Of particular interest is the use
of silicon photomultipliers (SiPMs) as the photosensor for such
scintillators in low-power and compact-geometry applications. Three types of
Li-loaded scintillators, CLYC, CLLB, and NaIL, have been tested with a
custom-designed SiPM array for temperatures between -20 and 50 degrees C. The
array consists of four 6x6 mm^2 SiPMs arranged in a 2x2 configuration.
Pulse-shape discrimination is used for neutron and gamma identification.
Because the pulse shape changes with temperature,
the quality of neutron-gamma identification varies with temperature.
Furthermore, the larger dark current in SiPMs at high temperatures results in
poorer energy resolution and neutron-gamma separation. Comparisons of the
energy resolution and the neutron-gamma pulse-shape discrimination for the
three scintillators coupled the SiPM array will be discussed.
