Experience and Application Possibilities of Scanning Devices for Monitoring Radiation Fields in Shut-Down Uranium–Graphite Reactors

This paper focuses on the evaluation of scanning devices for in-pile radiation measurement of the shut-down uranium–graphite reactors. The description of several generations of scanning devices is presented cause their design and configuration has been constantly improved in the light of experience and new objectives. Approaches and results of determining the metrological characteristics of γ- and neutron detectors of various types directly in reactor designs in which mixed radiation (α-, β-, γ-, and neutron radiation) prevails are considered. Estimates of the influence of the energy dependence of the sensitivity on the γ-detectors readings of different types, as well as the neutron detectors noise-immunity to γ-radiation, are presented.