Assessment of secondary radioactive contamination of a decontaminated land plot located on the territory of a recreation base in a wooded area

The article presents results of a long-term (1998–2021) radiological monitoring survey recreation base located in wooded area the zone radioactive contamination after accident at Chernobyl nuclear power plant. Local mechanical decontamination soil had been made on territory 1997. evaluation secondary decontaminated was performed by comparing dynamics situation treated plot and control, nondecontaminated, part according to four main criteria: 1) dose rate gamma radiation air from cesium radionuclides; 2) inventory 137 Cs soil; 3) vertical distribution 4) activity concentration plants fungi. In 1998, value upper 20 cm control 930 kBq/m 2 143 kBq/ m , respectively. By 2015, significantly decreased: 35% 36%, A decrease proceeded same rate, which is currently mainly determined decay Cs. There gradual self-restoration forest ecosystem subjected decontamination. Activity biota (pine, edible mushrooms) many times lower than that base. general, there no significant 24 years intervention.