129I and 36Cl concentrations in lichens collected in 1990 from three regions around chernobyl

Abstract 129 I and 36 Cl were measured by accelerator mass spectrometry in 11 lichen samples ( Parmelia sulcata ) collected in 1990 from three regions (Novozybkov, Bragin and Ovruc) near Chernobyl. Previously measured activities of 137 Cs were highest in the samples from the Novozybkov region while the measured activities of 36 Cl and 129 I in this study were highest in the samples from the Bragin region. The regional distribution patterns of the 36 Cl and 129 I show a positive correlation suggesting that these volatile radionuclides were deposited in the same manner.