Abstract
The characteristics of the neutron fields (spectrum, fluence) at four points of the GIR-2 reactor are measured. It is shown experimentally that the energy spectrum of leakage neutrons from the reactor core through an opening in a spherical converter, which consists of light elements and inside which the core is placed, becomes harder. This effect is due to the shift of the region in the core where the number density of fissions is high toward the lateral surface of the core as a result of the presence the converter, consisting of light elements, outside the core. On the basis of the results of these investigations, GIR-2 neutron fields are certified as reference standards for measurements.
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