137cs dating sediment Women mastubation chat
This study provides one test of that possibility by comparing recent measurements of Cs dating is used to confirm sediment accumulation rates in the recent cores.In the three Connecticut, USA, lakes studied, sediment accumulation rates changed abruptly to higher values between 40-50 yrs ago (increasing by factors of 2.2, 2.9, and 3.0).There is no radiochemical processing required with this technique.
Evidence from some lakes suggests that this radionuclide may be adequately mobile to compromise dating reliability.
Dating of wetland sediments and peat is routinely carried out using 137Cs and 210Pb analysis.
Unlike 210Pb, 137Cs is an anthropogenic radionuclide with a history of fallout from nuclear weapons testing.
Most potential causes for this difference can be ruled out, and it appears that one of the two nuclides is remobilized compared to the other.
There were also significant differences in the total inventories of both Pb and trace metals (both up to 2 ×) between recent and older cores in some cases.