This article is protected by copyright. All rights reserved. Use of fallout tracers 7 Be, 210 Pb and 137 Cs to distinguish the form of sub- surface soil erosion delivering sediment to rivers in large catchments Gary J. Hancock 1 , Scott N. Wilkinson 1 , Aaron A. Hawdon 2 , Rex J. Keen 2 . 1 CSIRO Land and Water, Canberra, ACT, 2601, Australia 2 CSIRO Land and Water, Townsville, Qld, Australia Gary.hancock@csiro.au This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/hyp.9926