Radioactive disequilibrium of uranium and actinium series nuclides in soil
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), Vol. 84:B7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
ACTINIUM 227
ACTIVITY LEVELS
GRANITES
WEATHERING
LEAD 210
RADIUM 226
SOILS
NATURAL RADIOACTIVITY
THORIUM 230
URANIUM 234
URANIUM 235
URANIUM 238
GEOCHEMISTRY
SAND
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ACTINIUM ISOTOPES
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHEMISTRY
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HEAVY NUCLEI
IGNEOUS ROCKS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEAD ISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-EVEN NUCLEI
RADIOACTIVITY
RADIOISOTOPES
RADIUM ISOTOPES
ROCKS
THORIUM ISOTOPES
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES
510301* - Environment
Terrestrial- Radioactive Materials Monitoring & Transport- Soil- (-1987)
580400 - Geochemistry- (-1989)