Estimation of fuel and condensation components of non-volatile radionuclides in depositions at large distances from the Chernobyl NPP

At a temperature 1500-2000 °C all Chernobyl depositions are volatile at a certain extent and "non-volatile" 141Ce, 144Ce, 95Zr, 95Nb, 239Np and others have been detected not only in the near zone of the Chernobyl NPP, but also at the distances up to several thousands km from the reactor. Basing on these measurements an algorithm has been developed for computing of fuel and condensation components activity of "non-volatile" radionuclides with the using of gamma-emitted radionuclides measurements in samples. The analysis of the data from Gomel, Mogilev and Bryansk oblasts demonstrated, that the main input of fuel components in the activity of "non-volatile" radionuclides occurred at distances less than 200 km from the Chernobyl NPP.