Abstract

The known all-wave neutron counter [i] makes possible neutron detection with approximately constant efficiency in the neutron energy range En = 200-5000 keV. The energy range was expanded somewhat in later modifications of this device [2]: En = 20-5000 keV. Also in [2], a description is given of a two-layer neutron counter that makes possible determination of average neutron energy in this range. A significant drawback of these devices is the decrease in the detection efficiency for neutrons having an energy En<20-200 keV. This limits the possibility of using them in reactors, where the energy of a sizable fraction of the neutrons falls in precisely this energy range.

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