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

Resumo

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.