FWO-Institutskolloquium “Composition and Redox Conditions in Historic Nu-clear Fallout”

Datum

16.09.2016

Zeit

10:00 - 11:00

Sprecher

Kiel S. HollidayLawrence Livermore National LaboratoryPhysical & Life Sciences Directorate

Sprache

en

Hauptthema

Chemie

Andere Themen

Physik

Host

Jana Gorzitze

Beschreibung

When testing ended in 1992, nearly 1 MCi of actinide activity was generated as a result of US underground nuclear weapons testing alone [1]. Credible modeling of radionuclide migration necessitates a thorough understanding of this source material. It was recently suggested from studies performed on Trinity debris that nearly all of the environmental Fe incorporated into fallout was reduced to ferrous forms [2]. In Trinity this is complicated by the metallic iron present from the tower and may not be representative of fallout from other tests. In this study we combine XANES/XAFS, autoradiography, and SEM/EDS to characterize aerodynamic fallout from nuclear tests. Both U and Fe were characterized by XANES/XAFS to determine redox con-ditions in fallout from four nuclear tests. Autoradiography was used to map actinide concentration and correlate that data with major element composition as determined by SEM/EDS. This more complete description of the actinide material in nuclear fallout will aid in the modelling of radionuclide migration. References [1] Bowen et al. (2001) LANL Report LA-13859-MS [2] Giuli et al. (2010) Geological Society of America Special Paper 465, 653-660

Letztmalig verändert: 16.09.2016, 09:50:58