Abstract <p>The tokamak with reactor technologies (TRT) is intended for experiments with powerful auxiliary heating of deuterium plasma (up to 40 MW) during a long pulse (100 s) with a neutron output of 10¹⁷ neutrons/s. Analysis of the radiation environment arising during the execution of the experimental program on the thermonuclear facility is required at an early stage of tokamak design to make engineering decisions that ensure safe operation of the facility, taking into account all radiation-related aspects such as possible heating of the superconducting magnet system, levels of radiation damage and neutron shielding, activation of structural materials, dose rates, and the safety of maintenance personnel. This paper presents results of simulation of the transport of neutron and gamma (photon) radiation for the experiments planned on the TRT. Spatial distributions of neutron and photon radiation fields are determined, and neutron fluxes and spectra are calculated in key structures and components of the tokamak—the vacuum vessel, HTS cables, toroidal field coils, and elements of diagnostic systems. An assessment of activation of the vacuum vessel is performed and the time evolution of dose-rate decay is shown.</p>