[en] Purpose of carried out studies was to check the influence of accident on nuclear object ChNPP with ejection in environment of biologically dangerous radionuclides on accumulation by mushrooms - basidiomizents ¹³⁷Cs (content of ⁹⁰Sr in bodies of mushrooms less on 3-4 orders). In territory of a modern zone rehabilitation before accident (1981-1985) the sole simulated radionuclide - global ¹³⁷Cs was fixed in mushrooms