Americium retention and migration behaviour in Boom Clay. Topical report, first full draft

Research outputpeer-review

Abstract

This report presents the most up-to-date understanding and data of americium (Am) transport in the Boom Clay formation. Americium prevails under Boom Clay conditions as a redox stable trivalent actinide ion. Am is chemically analogous to Europium, which has been equally intensively studied for its speciation and migration behaviour in Boom Clay, and to other, less-studied, trivalent actinides and lanthanides such as Cm3+, Sm3+, Ac3+ and Pu3+. The phenomenological model for these elements is based on a dual transport pathway: americium is either transported as a dissolved species with high retention by sorption or as a colloidal species associated with dissolved organic matter. Exchange between the two species follows a kinetic rate law. In this report the main experimental data underbuilding this model are summarised and appropriate transport equations and parameter value ranges are derived.
Original languageEnglish
PublisherSCK CEN
Number of pages175
Volume1
Edition0
StatePublished - Jan 2012

Publication series

NameSCK•CEN Reports
PublisherStudiecentrum voor Kernenergie
No.ER-201

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