  The response of a position-sensitive Li-glass scintillator detector being
developed for thermal-neutron detection with 6 mm position resolution has been
investigated using collimated beams of thermal neutrons. The detector was moved
perpendicularly through the neutron beams in 0.5 to 1.0 mm horizontal and
vertical steps. Scintillation was detected in an 8 X 8 pixel multi-anode
photomultiplier tube on an event-by-event basis. In general, several pixels
registered large signals at each neutron-beam location. The number of pixels
registering signal above a set threshold was investigated, with the
maximization of the single-hit efficiency over the largest possible area of the
detector as the primary goal. At a threshold of ~50% of the mean of the
full-deposition peak, ~80% of the events were registered in a single pixel,
resulting in an effective position resolution of ~5 mm in X and Y. Lower
thresholds generally resulted in events demonstrating higher pixel
multiplicities, but these events could also be localized with ~5 mm position
resolution.
