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Radioactive disequilibrium of uranium and actinium series nuclides in soil

Journal Article · · J. Geophys. Res.; (United States)

The concentration of uranium series nuclides (/sup 238/U, /sup 234/U, /sup 230/Th, /sup 226/Ra, and /sup 210/Pb) and actinium series nuclides (/sup 235/U and /sup 227/Ac) were determined by ..gamma.. ray spectrometry for size-separated soil samples collected in Murho and originating from the weathering of granite rock. Each activity ratio of a descendant to /sup 238/U or /sup 235/U is found to be larger than unity. Extraction tests show that approximately 50% of the uranium series nuclides reside on the surface of soil particles and approximately 80% of the /sup 230/Th is surface correlated. Because of the anomalously high radioactivity levels, it was possible to obtain sufficient data to estimate the age of weathering of the soil. A weathering age of >10/sup 3/ years was estimated from the /sup 230/Th and /sup 226/Ra surface-correlated activities.

Research Organization:
Radiation Center of Osaka Prefecture, Shinke-cho, Sakai-shi, Osaka, Japan
OSTI ID:
6098817
Journal Information:
J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 84:B7; ISSN JGREA
Country of Publication:
United States
Language:
English

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Related Subjects

510301* -- Environment
Terrestrial-- Radioactive Materials Monitoring & Transport-- Soil-- (-1987)
54 ENVIRONMENTAL SCIENCES
58 GEOSCIENCES
580400 -- Geochemistry-- (-1989)
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ACTINIUM 227
ACTINIUM ISOTOPES
ACTIVITY LEVELS
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHEMISTRY
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GEOCHEMISTRY
GRANITES
HEAVY NUCLEI
IGNEOUS ROCKS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEAD 210
LEAD ISOTOPES
MINUTES LIVING RADIOISOTOPES
NATURAL RADIOACTIVITY
NUCLEI
ODD-EVEN NUCLEI
RADIOACTIVITY
RADIOISOTOPES
RADIUM 226
RADIUM ISOTOPES
ROCKS
SAND
SOILS
THORIUM 230
THORIUM ISOTOPES
URANIUM 234
URANIUM 235
URANIUM 238
URANIUM ISOTOPES
WEATHERING
YEARS LIVING RADIOISOTOPES