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Digitale Medien

Displacement rates of normal faults (1997)

Nicol ; A. ; Watterson, J. ; [weitere]

[s.l.] : Macmillan Magazines Ltd.

Nature 390 (1997), S. 157-159

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] Previous estimates of displacement rates on individual faults have been limited to neotectonic faults and averaged over time intervals of about 200 kyr or less. These estimates have been highly variable, which has led to a belief that longer-term displacement rates on individual faults are ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/36548

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Digitale Medien

Enhanced airborne radioactivity during a pine pollen release episode (1999)

Tschiersch, J. ; Frank, G. ; Roth, P. ; [weitere]

Springer

Radiation and environmental biophysics 38 (1999), S. 139-145

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ISSN: 1432-2099

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Physik

Notizen: Abstract A single episode of pine pollen release in the highly contaminated area of Novozybkov, Russian Federation, which led to enhanced atmospheric concentrations of 137Cs is discussed. The pollen grains were sampled by a rotating arm impactor and analysed by gamma-spectrometry for 137Cs activity and by image analysis for their size. In the vicinity of a forest, a maximum concentration of 4.5±0.4 mBq m–3 was measured, and a mean activity per pollen grain of 260±80 nBq was determined. The emission rate of the Novozybkov mixed pine forest was estimated to be approximately 400 Bq m–2 per year. Because of the large size of pine pollen grains (about 50 µm) and the short emission period of 5–8 days per year, the estimated potential annual inhalation doses are very low. Biological emissions including pollen release may be a source of increased airborne radionuclide concentrations at larger distances from the source areas as well.