G. J. Hancock, S. N. Wilkinson, A. A. Hawdon, and R. J. Keen, Use of fallout tracers 7 Be, 210 Pb, vol.748, p.137, 2014.

, Cs to distinguish the form of sub-surface soil erosion delivering sediment to rivers in large 749 catchments, Hydrological Processes, vol.28, pp.3855-3874

Q. He and D. Walling, Interpreting particle size effects in the adsorption of 137 Cs, p.210, 1996.

, Pb by mineral soils and sediments, J Environ Radioact, vol.30, pp.117-137

Q. He and D. E. Walling, Interpreting Particle Size Effects in the Adsorption of 137 Cs and 753 Unsupported 210 Pb by Mineral Soils and Sediments, J Environ Radioact, vol.30, pp.117-137, 1995.

S. Health and E. Laboratory, New York 10014, (1977) Final tabulation of monthly strontium-90 755 fallout data, pp.1954-1976

B. R. Hill, E. H. Decarlo, C. C. Fuller, and M. F. Wong, Using sediment 'fingerprints' to assess 757 sediment-budget errors, Earth Surface Processes and 758 Landforms, vol.23, pp.493-508, 1998.

S. E. Hobgen, B. A. Myers, R. P. Fisher, and R. J. Wasson, Creating a sediment budget in a data poor 760 context: an example from Eastern Indonesia, Geografiska Annaler: Series A, vol.96, pp.761-513, 2014.

D. Huang, P. Du, D. E. Walling, D. Ning, X. Wei et al., Using reservoir deposits to 763 reconstruct the impact of recent changes in land management on sediment yield and sediment 764 sources for a small catchment in the Black Soil region of Northeast China, Geoderma, vol.343, pp.139-154, 2019.

D. Huang, P. Du, J. Wang, X. Wei, B. Liu et al., Using reservoir deposits to quantify the 766 source contributions to the sediment yield in the Black Soil Region, Northeast China, based on the 767 fingerprinting technique, Geomorphology, vol.339, pp.1-18, 2019.

A. O. Hughes, J. M. Olley, J. C. Croke, and L. A. Mckergow, Sediment source changes over the last 769 250 years in a dry-tropical catchment, central Queensland, Australia. Geomorphology, vol.104, pp.262-275, 2009.

N. L. Huisman and K. Karthikeyan, Using radiometric tools to track sediment and phosphorus 771 movement in an agricultural watershed, Journal of Hydrology, vol.450, pp.219-229, 2012.

N. L. Huisman, K. G. Karthikeyan, J. Lamba, A. M. Thompson, and G. Peaslee, Quantification of 773 seasonal sediment and phosphorus transport dynamics in an agricultural watershed using 774 radiometric fingerprinting techniques, Journal of Soils and Sediments, vol.13, pp.1724-1734, 2013.

S. Huon, A. De-rouw, P. Bonté, H. Robain, C. Valentin et al., , p.776

P. Podwojewski and O. Sengtaheuanghoung, Long-term soil carbon loss and accumulation in a 777 catchment following the conversion of forest to arable land in northern Laos, Agriculture, vol.778, pp.43-57, 2013.

S. Huon, O. Evrard, E. Gourdin, I. Lefèvre, T. Bariac et al., , p.780

O. Sengtaheuanghoung, S. Ayrault, and O. Ribolzi, Suspended sediment source and propagation 781 during monsoon events across nested sub-catchments with contrasted land uses in Laos, Journal of 782 Hydrology: Regional Studies, vol.9, pp.69-84, 2017.

A. M. Jalowska, B. A. Mckee, J. P. Laceby, and A. B. Rodriguez, Tracing the sources, fate, and 784 recycling of fine sediments across a river-delta interface, Catena, vol.154, pp.95-106, 2017.

M. P. Johansen, T. E. Hakonson, F. W. Whicker, and D. D. Breshears, Pulsed redistribution of a 786 contaminant following forest fire, Journal of environmental quality, vol.32, pp.2150-2157, 2003.

C. S. Turney, J. Palmer, M. A. Maslin, A. Hogg, C. J. Fogwill et al., , p.998

J. M. Wilmshurst, M. Mcglone, C. Bronk-ramsey, Z. Thomas, M. Lipson et al., , p.999

O. Andrews and Q. Hua, Global Peak in Atmospheric Radiocarbon Provides a Potential Definition 1000 for the Onset of the Anthropocene Epoch in 1965, Sci Rep, vol.8, p.3293, 2018.

, UNSCEAR (2000) Sources and effects of ionizing radiation

B. Van-der-waal, K. Rowntree, and S. Pulley, Flood bench chronology and sediment source tracing 1003 in the upper Thina catchment, South Africa: the role of transformed landscape connectivity, Journal 1004 of Soils and Sediments, 2015.

M. Vanmaercke, J. Poesen, J. Broeckx, and J. Nyssen, Sediment yield in Africa, Earth-Science 1006 Reviews, vol.136, pp.350-368, 2014.

P. Wallbrink, J. M. Olley, and G. Hancock, Estimating residence times of fine sediment in river 1008 channels using fallout 210 Pb, vol.276, pp.425-432, 2002.

P. J. Wallbrink, Quantifying the erosion processes and land-uses which dominate fine sediment 1010 supply to Moreton Bay, J Environ Radioact, vol.76, pp.67-80, 2004.

P. J. Wallbrink and A. S. Murray, Use of fallout radionuclides as indicators of erosion processes. 1012 Hydrological processes, vol.7, pp.297-304, 1993.

P. J. Wallbrink, A. S. Murray, J. Olley, and L. J. Olive, Determining sources and transit times of 1014 suspended sediment in the Murrumbidgee River, New South Wales, p.210, 1998.

, Pb. Water Resources Research, vol.4, pp.879-887

P. J. Wallbrink, A. S. Murray, and J. M. Olley, Relating suspended sediment to its original soil depth 1017 using fallout radionuclides, Soil Science Society of America Journal, vol.63, pp.369-378, 1999.

D. Walling and C. Amos, Source, storage and mobilisation of fine sediment in a chalk stream 1019 system, Hydrological Processes, vol.13, pp.323-340, 1999.

D. Walling, A. Collins, H. Sichingabula, and G. Leeks, Integrated assessment of catchment 1021 suspended sediment budgets: a Zambian example, Land Degradation & Development, vol.12, pp.387-415, 2001.

D. Walling, P. Owens, I. D. Foster, and J. Lees, Changes in the fine sediment dynamics of the Ouse 1023 and Tweed basins in the UK over the last 100-150 years, Hydrological Processes, vol.17, pp.3245-3269, 2003.

D. Walling and J. Woodward, Use of radiometric fingerprints to derive information on suspended 1025 sediment sources. Erosion and sediment transport monitoring programmes in river basins 210, pp.153-1026, 1992.

D. Walling and J. Woodward, Tracing sources of suspended sediment in river basins: a case study 1028 of the River Culm, vol.46, pp.327-336, 1995.

D. Walling, J. Woodward, and A. Nicholas, A multi-parameter approach to fingerprinting 1030 suspended-sediment sources, IAHS publication, pp.329-338, 1993.

D. E. Walling, Tracing suspended sediment sources in catchments and river systems, Sci Total 1032 Environ, vol.344, pp.159-184, 2005.

D. E. Walling, The evolution of sediment source fingerprinting investigations in fluvial systems, 1034 Journal of Soils and Sediments, vol.13, pp.1658-1675, 2013.

D. E. Walling, A. L. Collins, P. A. Jones, G. J. Leeks, and G. Old, Establishing fine-grained sediment 1036 budgets for the Pang and Lambourn LOCAR catchments, UK. Journal of Hydrology, vol.330, pp.126-141, 2006.

D. E. Walling, A. L. Collins, and R. W. Stroud, Tracing suspended sediment and particulate 1038 phosphorus sources in catchments, Journal of Hydrology, vol.350, pp.274-289, 2008.

D. E. Walling, P. N. Owens, and G. J. Leeks, Fingerprinting suspended sediment sources in the 1040 catchment of the River Ouse, Hydrological Processes, vol.13, pp.955-975, 1999.

A. S. Wethered, T. J. Ralph, H. G. Smith, K. A. Fryirs, and H. Heijnis, Quantifying fluvial 1042 (dis)connectivity in an agricultural catchment using a geomorphic approach and sediment source 1043 tracing, Journal of Soils and Sediments, 2015.

P. J. Whiting, G. Matisoff, W. Fornes, and F. M. Soster, Suspended sediment sources and transport 1045 distances in the Yellowstone River basin, Bulletin of the Geological Society of America, vol.117, pp.515-529, 2005.

S. N. Wilkinson, G. J. Hancock, R. Bartley, A. A. Hawdon, and R. J. Keen, Using sediment tracing to 1047 assess processes and spatial patterns of erosion in grazed rangelands, Ecosystems & Environment, vol.180, pp.90-102, 1048.

S. N. Wilkinson, J. M. Olley, T. Furuichi, J. Burton, and A. E. Kinsey-henderson, Sediment source 1050 tracing with stratified sampling and weightings based on spatial gradients in soil erosion, Journal of 1051 Soils and Sediments, vol.15, pp.2038-2051, 2015.

S. N. Wilkinson, P. J. Wallbrink, G. J. Hancock, W. H. Blake, R. A. Shakesby et al., Fallout 1053 radionuclide tracers identify a switch in sediment sources and transport-limited sediment yield 1054 following wildfire in a eucalypt forest, Geomorphology, vol.110, pp.140-151, 2009.

M. Zebracki, F. Eyrolle-boyer, O. Evrard, D. Claval, B. Mourier et al., 1056 (2015) Tracing the origin of suspended sediment in a large Mediterranean river by combining 1057 continuous river monitoring and measurement of artificial and natural radionuclides, vol.502, pp.122-132

F. Zehetner, N. L. Vemuri, C. Huh, S. Kao, S. Hsu et al., Soil and 1060 phosphorus redistribution along a steep tea plantation in the Feitsui reservoir, p.1061, 2008.

. Taiwan, Soil Science and Plant Nutrition, vol.54, pp.618-626

X. C. Zhang, G. H. Zhang, B. L. Liu, and B. Liu, Using cesium-137 to quantify sediment source 1063 contribution and uncertainty in a small watershed, Catena, vol.140, pp.116-124, 2016.

H. Zhou, W. Chang, and L. Zhang, Sediment sources in a small agricultural catchment: A 1065 composite fingerprinting approach based on the selection of potential sources, Geomorphology, vol.266, pp.1066-1077, 2016.

, Overall, 50% of data were missing for this period, as most of 67 the monitoring stations did not show continuous records. Of note, the global fallout period (1963-68 1967) is that with the lowest proportion of missing data, ranging from 20 to 30% in both 69 hemispheres, 1977.

, Box-plots of 137 Cs activities (decay-corrected to January 1, 2019) in surface and subsurface 96 sources across the globe, vol.6

, Click here to download Supplementary material for online publication only: SM1_literature-review-data.xlsx SM2 Click here to download Supplementary material for online publication only: SM2_137Cs_literature-values-Final