Published 2001 | Version v1
Book Metadata-only

Isotopic fractionation of U in rocks reflecting redox conditions around a groundwater flow route

Creators

  • 1. University of Helsinki, Helsinki (Finland). Laboratory of Radiochemistry
  • 2. VTT Energy, Espoo (Finland)

Description

Low 234U/238U activity ratios observed in rock and mineral samples were scrutinized. U isotope fractionation leading to 234U depletion (234U/238U<1) in rocks appears to be linked to changes in redox conditions. The fractionation takes place as selective chemical release dominates over direct physical α recoil. This preferential 234U release depends on the valence contrast between the U isotopes, 238U occurring in +4 form and ingrown 234U, due to oxidizing microenvironment, in +6 form. Observed U isotopic fractionation combined with other uranium series disequilibrium measurements provides a tool for locating redox fronts formed as a result low temperature rock-groundwater interaction. Copyright (2001) Material Research Society

Additional details

Identifiers

URL
http://www.mrs.org/;

Publishing Information

Publisher
Materials Research Society
Imprint Place
Warrendale, PA (United States)
ISBN
1-55899-598-6
Imprint Title
Scientific basis for nuclear waste management XXIV: Materials Research Society symposium proceedings: Volume 663
Imprint Pagination
1232 p.
Journal Page Range
p. 961-969
ISSN
0275-0112

Conference

Title
Scientific basis for nuclear waste management XXIV
Dates
27-31 Aug 2000
Place
Sydney, NSW (Australia)

INIS

Country of Publication
United States
Country of Input or Organization
Australia
INIS RN
34038826
Subject category
S54: ENVIRONMENTAL SCIENCES;
Resource subtype / Literary indicator
Conference
Descriptors DEI
DEPLETED URANIUM; FRACTIONATION; GROUND WATER; ISOTOPE RATIO; NATURAL ANALOGUE; REDOX POTENTIAL; ROCK-FLUID INTERACTIONS; URANIUM 234; URANIUM 238; VALENCE
Descriptors DEC
ACTINIDE NUCLEI; ACTINIDES; ALPHA DECAY RADIOISOTOPES; ELEMENTS; EVEN-EVEN NUCLEI; HEAVY ION DECAY RADIOISOTOPES; HEAVY NUCLEI; HYDROGEN COMPOUNDS; ISOTOPES; MAGNESIUM 28 DECAY RADIOISOTOPES; METALS; NEON 24 DECAY RADIOISOTOPES; NUCLEI; OXYGEN COMPOUNDS; RADIOISOTOPES; SEPARATION PROCESSES; SPONTANEOUS FISSION RADIOISOTOPES; URANIUM; URANIUM ISOTOPES; WATER; YEARS LIVING RADIOISOTOPES

Optional Information

Notes
17 refs., 1 tabs., 6 figs.