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. 2017 Feb 23;7:43040. doi: 10.1038/srep43040

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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The figure illustrates the concentration of total ²¹⁰Pb (a) and radiocaesium (b) throughout the top, 200 cm deep, section of the peat profile. The blue wavy line represents the water lens occurring throughout the profile. Supported ²¹⁰Pb (i.e., ²²⁶Ra) concentrations are extremely low (typically <2 Bq/kg), reflecting the highly OM content of the peat. Consequently, unsupported (fallout) ²¹⁰Pb concentrations are scarcely distinguishable from total ²¹⁰Pb concentrations. More details are reported in Supplementary Table S5.