Pb 210 dating method

29 Dec

The overall result is that radium-226 is found at low and essentially unchanging levels in soils everywhere.

metal), if it is produced in soils close to the air-soil interface.

By dating meteorites Patterson was directly dating the age of various planetesimals.

Assuming the process of elemental differentiation is identical on Earth as it is on other planets, the core of these planetesimals would be depleted of uranium and thorium, while the crust and mantle would contain higher U/Pb ratios.

The naturally lead isotope 210Pb may be used to date aquatic sediments and peat bogs.

The method is suitable for dating approximately 100 years back.

Over time the uranium-238 very slowly decays into uranium-234 (half-life = 248,000 ).

Radium-226 in the soil exhibits the same level of radioactivity as uranium-238 from which it was originally derived, because of a natural phenomenon called secular equilibrium.

The sediment samples must remain totally undisturbed during sampling to obtain the best possible dating.In addition, the results of the sensitivity analysis are reported.The sediment dating may be supplemented with estimations of the content of alga pigments in the depths required.Lead-lead dating is a method for dating geological samples, normally based on 'whole-rock' samples of material such as granite.For most dating requirements it has been superseded by uranium-lead dating (U-Pb dating), but in certain specialized situations (such as dating meteorites and the age of the Earth) it is more important than U-Pb dating. As evident by the equation, initial Pb isotope ratios, as well as the age of the system are the two factors which determine the present day Pb isotope compositions.