Investigation of a Two-Coordinate Gas-Discharge Detector of Slow Neutrons with a 10B Solid Converter

A two-coordinate detector based on a 10 B layer and a gas-discharge chamber with a sensitive area of 128 mm 2 and 3-mm-thick input and output windows intended for recording slow neutrons are investigated. The recording efficiency is more than 3% at a wavelength of 1.82 Å. The recording efficiency is estimated to be ~8% at a wavelength of 8 Å. The measured background contribution is less than 0.0001% of the thermal neutron one. For the Ar + 25%CO 2 + 0.3%CF 3 Br gas mixture, the spatial resolution is about 2 mm along one of the coordinates under standard conditions. The neutron position is determined by the charge division method.