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Here we develop a new model for 210Pb dating, where both ages and values of supported and unsupported 210Pb form part of the parameters.
We apply our model to a case study from Canada as well as to some simulated examples.
210Pb chronology does not cover all anthropogenic impacts, such as those caused by ancient civilizations, so radiocarbon also plays an important role in this kind of work.
We also conceptually revise the limitations of both techniques and encourage scientists to link both dating techniques with a symmetrically open mind.
Irrespective of the model names used, assumptions and (usually forgotten) uncertainties, the fact is that 210Pb sediment dating is an increasingly relevant tool in our world of global change.
210Pb dating results are needed to assess historical trends of sea level rise, quantify blue carbon fluxes and reconstruct environmental records of biogeochemical proxies for diverse processes in the aquatic ecosystems (such as ocean acidification, hypoxia and pollution).
Our model can extend beyond the current CRS approach, deal with asymmetric errors and mix 210Pb with other types of dating, thus obtaining more robust, realistic and statistically better defined estimates.
Lead-204 is entirely a primordial nuclide and is not a radiogenic nuclide.
In 2014, annual global production of lead was about ten million tonnes, over half of which was from recycling.
The three isotopes lead-206, lead-207, and lead-208 represent the ends of three decay chains: the uranium series (or radium series), the actinium series, and the thorium series, respectively.