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Markus Fiebig on behalf of SEQS The newly-renamed Section on European Quaternary Stratigraphy – previously the Subcommission on European Quaternary Stratigraphy (SEQS) – is a constituent body of the International Union of Quaternary Research (INQUA), Commission on Stratigraphy and Geochronology (SACCOM). The SEQS is a group devoted to the study of the Quaternary Period in Europe, the last 2.6 million years of Earth’s history. First there is the radiation in the soils and rocks, called primordial or terrestrial.Then there is radiation that comes from space, called cosmic or cosmogenic.However, certain work activities can give rise to significantly enhanced exposures that may need to be controlled by regulation.Material giving rise to these enhanced exposures has become known as naturally occurring radioactive material (NORM).

cosmogenic exposure dating-15

However, the term is used more specifically for all naturally occurring radioactive materials where human activities have increased the potential for exposure compared with the unaltered situation.

Its existence had been suggested by Franz Kurie in 1934. The primary natural source of carbon-14 on Earth is cosmic ray action on nitrogen in the atmosphere, and it is therefore a cosmogenic nuclide.

However, open-air nuclear testing between 1955–1980 contributed to this pool.

Antarctic Peninsula ice shelves | Ice shelf collapse on the Antarctic Peninsula | Rifting on Larsen C | Impact of calving the large iceberg | Sea level rise following ice-shelf collapse | References | Comments | The Antarctic Peninsula is fringed by floating ice shelves.

They are floating extensions of the glaciers on land, and receive mass by snowfall and marine freeze-on.