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Long-lived radioactive elements such as uranium, thorium and potassium and any of their decay products, such as radium and radon are examples of NORM.These elements have always been present in the Earth's crust and atmosphere, and are concentrated in some places, such as uranium orebodies which may be mined.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.Concentrations of actual radionuclides may or may not have been increased; if they have, the term Technologically-Enhanced (TENORM) may be used.

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cosmogenic isotope surface exposure dating-52

Diese Forschungen wurden finanziell durch den sterreichischen FWF und (unter anderem) das International Continental Drilling Program (ICDP) untersttzt. Weiters wurde 2009 eine Tiefbohrung am El'gygytgyn Meteoritenkrater im arktischen Teil Russlands durchgefhrt, wobei im Rahmen eines internationalen Projektes sowohl Paloklimafragen als auch die Untersuchung des Meteoritenkraters im Mittelpunkt stehen. Die Forschungsarbeiten an diesen Bohrkernen haben gerade 2010 begonnen. Springer Verlag, Heidelberg, 312 pp (ISBN 3-540-42286-2). (2002) Catastrophic Events and Mass Extinctions: Impacts and Beyond. Ab 2011 oder 2012 wird in einer weiteren internationalen Zusammenarbeit im Nordosten Chinas, im Songliao Becken, eine fast 10 km tiefe Bohrung niedergebracht, wobei Gesteinsschichten der letzten 150 Millionen Jahre detailliert untersucht werden sollen. 93, Springer Verlag, Heidelberg, 364 pp (ISBN 3-540-66368-1). (2001) Geological and Biological Effects of Impact Events. Geological Society of America, Special Paper 356, 746 pp (ISBN 0-8137-2356-6). This diverse collection of asteroids may include primitive objects (that is, early, unprocessed material left over from the accretion or partial accretion of the planets from the solar nebula), but also the disaggregated remains of now destroyed former planetary bodies, some of which had resided much closer to the Sun.There are other known asteroids that do not orbit within the Main Belt (such as various near Earth objects or NEOs), and some of these also could be sources of meteorites.

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