Abstract
In this paper, the radiological and economic issues of dismantling cyclotrons of various types, the accumulation
 of radionuclides in the details of the cyclotron itself, and the activation of the walls of the cyclotron bunker
 due to the capture of secondary neutrons are considered. As a result of (n,γ)-reactions on thermal neutrons, radionuclides
 152Eu, 60Co, 46Sc are formed in the concrete of the cyclotron bunker with a half-life of 2,6 to 14 years
 and an activity of 0,1–11 kBq/kg. The maximum of their distribution usually lies at a depth of 10–15 cm. In the
 details of the cyclotron and the metal infrastructure of the bunker, the main radionuclides are 54Mn, 57Co, 65Zn.
 The analysis of the accumulation of long-lived radionuclides is of great importance for the design of new cyclotron
 facilities in order to ensure radiation safety and storage of radioactive waste and, as a result, to minimize the
 radiation exposure of personnel during the dismantling of the cyclotron.
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