Computation and experimental research into certain characteristics of neutron fields in the lava-like fuel containing materials concentrations in the under reactor room 304/3 of the 'Ukrytie' object

The subject of the investigations is neutron-physical characteristics of the lava-like fuel containing masses in the Unit 4 of the Chernobyl NPP. On the basis of the under reactor room 304/3 as an example computation methods are developed, neutron flux density and fission integrals for 235U, indices of <σf8>/<σf5> and <σf9>/<σf5>, cadmium ratio for 235U are computed. Through the usage of solid track detectors 235U fission integral and cadmium ratio for 235U are measured on the surface of the lava-like fuel containing masses in the room 304/3 and in the borehole Z.9.M. 11 refs., 6 tab