Like the lighter members of the group, lead exhibits a tendency to bond to itself; it can form chains, rings, and polyhedral structures.

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.

In a related article on geologic ages (Ages), we presented a chart with the various geologic eras and their ages.

In a separate article (Radiometric dating), we sketched in some technical detail how these dates are calculated using radiometric dating techniques.

The age of the sediment from a particular depth in the sediment column can then be inferred.

If modelling and interpretation are requested, the Pb-210 results will normally be modelled to obtain the best fit of the data, where possible.

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.

We have been providing radioisotope dating services for over 30 years and have dated cores from around the world (See the map below).

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