[en] A brief characteristic of the results of the use f a series of chemosorptional fibers and materials on their basis for solving ecological problems is provided. Conditions for fiber preparation by cycling of grafted copolymer Ts-PAN, featuring static exchange capacity in terms of cadmium (2) ions, equal to 45 mg/g, are described. Characteristics of sorbents on the basis of the TsM-A2, TsM-KT, mtilon-T fibers, used for the determination of radionuclide concentration (¹³⁷Cs, anionic forms of iodine) in process water of NPP and reservoirs, as well as chemosorptional fiber Ts-KF, which can exract ¹³⁷Cs selectively from milk contaminated by radionuclides, are presented