Two-dimensional position sensitive neutron detector

A two-dimensional position sensitive neutron detector has been developed. The detector is a 3He + Kr filled multiwire proportional counter with charge division position readout and has a sensitive area of 345 mm x 345 mm, pixel size 5 mm x 5 mm, active depth 25 mm and is designed for efficiency of 70% for 4 A neutrons. The detector is tested with 0.5 bar 3He + 1.5 bar Krypton gas mixture in active chamber and 2 bar 4He in compensating chamber. The pulse height spectrum recorded at an anode potential of 2000 V shows energy resolution of ∼25% for the 764 keV peak. A spatial resolution of 8 mm x 6 mm is achieved. The detector is suitable for SANS studies in the Q range of 0.02-0.25 A -1. (author)