Dating Methods Based on the Radioactive Disequilibrium; METHODES DE CHRONOLOGIE PAR LE DESEQUILIBRE RADIOACTIF
The existence in the uranium families of two long-life descendants, ionium (half life 80,000 years) and protactinium (half life 32,000 years) together with the differences in geochemical behavior of the various natural radioelements, particularly thorium, makes it possible to envisage several models of geological time scales covering periods to 500,000 years. The theory of two of the most important models is developed and methods are described for making radiochemical measurements on the various nuclides which are essential for resolving these models (U/sup 238/ Th/sup 234/Th/sup 230/Ra/sup 226/Pa/sup 231, Th/sup 232/Pl/sup 210/ ample of dating is given in the case of a secondary mineralization on a weathered portion of a deposit in the Limouzat (Forez). Samples of autunite and chalcolite taken at different levels of the mine were calculated to be between 30,000 and 240,000 years old. (auth)
- Research Organization:
- France. Commissariat a l'Energie Atomique. Centre d'Etudes Nulceaires, Fontenay-aux-Roses
- NSA Number:
- NSA-16-010273
- OSTI ID:
- 4793056
- Report Number(s):
- CEA-2034
- Country of Publication:
- France
- Language:
- English
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Related Subjects
AUTUNITE
CALCIUM PHOSPHATES
CHALCOCITE
DECAY
DEPOSITS
GEOCHEMISTRY
GEOLOGY
GEOLOGY, MINERALOGY, AND METEOROLOGY
MEASURED VALUES
MINERALS
POLONIUM 210
PROTACTINIUM 231
RADIOACTIVITY
RADIOCHEMISTRY
RADIOISOTOPES
RADIUM 226
STABILITY
THORIUM 228
THORIUM 230
THORIUM 232
THORIUM 234
URANIUM 235
URANIUM 238
URANIUM MINERALS