A long-term study of radionuclide concentrations in mushrooms in the 30-km zone around the Mining-and-Chemical Combine (Russia).

Cs concentrations were measured in mushrooms in an area affected by radioactive discharges of the Mining-and-Chemical Combine (MCC) (Rosatom, Russia) in 2002-2017. The sources of radionuclides in the study sites were global fallouts and waterborne and airborne radioactive discharges of the MCC. The mushroom species and showed the highest Cs concentrations (140-7100 Bq kg) for this area. Over the entire monitoring period, no significant change in Cs concentration was observed in the spp. samples collected from the sites with the aerial deposition of radionuclides. In the floodplain site with the radionuclide deposition from water and air, a significant decrease in the average Cs concentration was observed in the period between 2004 and 2017: a three-fold decrease in spp. and a nine-fold decrease in . The effective half-lives of Cs in fruiting bodies of the mushrooms and spp. in this site were 3.6 ± 0.6 and 9.2 ± 2.7 years, respectively.