Chernobyl accident which took place in the night since 25 till 26, April is the most considerable nuclear accident of our days. ... The head of the Expedition – head of laboratory I.N. Ryabov, deputy head – I.A. Ryabtsev. ... Preprints “Scientific reports”. ... Scientific leader of Complex Radioecological Expedition academician V.E. Sokolov, head of expedition I.N. Ryabov, dbs N.V. Kulikov (Chernobyl, 1987) . ... Head of Complex Radioecological Expedition I.N. Ryabov and famous radiobiologist Zh.A.. ...