Accuracy of Determining Coordinates by Means of Charge Division in a Position-Sensitive Thermal Neutron Detector Based on Boron-10

Abstract

A charge division algorithm is proposed for determining coordinates in a positional sensitive neutron detector based on a layer of 10B and an ion chamber. Experimental impedances of the input resistances of amplifiers and their gain factors are considered in order to improve spatial resolution. The best spatial resolution of ~2 mm with respect to the horizontal X-coordinate and ~4 mm with respect to the vertical Y-coordinate is achieved at a power supply voltage of 700 V. The efficiency of thermal neutron registration is ~3%. A helium-3 counter of known efficiency is used to monitor thermal neutrons.