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IRSN, Institut de radioprotection et de sûreté nucléaire

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Enhancing Nuclear Safety


Research

Thesis proposals 2018

Mechanisms of uranium aging in sedimentary deposits: spectroscopic approaches and geochemical modeling


Thesis location: Research Laboratory on the Future of the Radioactive Sites Pollution (LELI) (Fontenay-aux-Roses, France)

Start of the project: October 2018

 

Skills required

 

  • Master degree or equivalent (Engineering schools)
  • Skills in geochemistry, mineralology, solid phases characterization, geochemical modeling, actinoid chemistry
  • High level skill in English language

 

Thesis topic

 

This thesis aims to study the evolution of uranium mobility in lacustrine environments, at time scales of several hundred years.

 

This work will consist in identifying the mechanisms controlling uranium chemistry in pore waters and monitoring the mineralogical evolution of this element in the solid phase. It is based on fine sampling operations of solid and liquid samples in a controlled environment, pore water analyses in laboratory and the use of spectroscopic techniques for identifying uranium bearing phases in environmental samples.

 

Studies of mineralogy and uranium isotope ratios in sediments will also be simultaneously undertaken. Mechanisms related to the evolution of uranium mobility deduced from the acquired data will then be validated according to geochemical codes adapted to the problem raised.


 



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