Half-life of /sup 138/La
Technical Report
·
OSTI ID:6291334
Tanaka and Masuda recently have observed /sup 138/Ce//sup 142/Ce isotopic abundance ratios which vary linearly with the /sup 138/La//sup 142/Ce abundance ratios in samples of ancient rocks. These variations have been interpreted to be the result of in situ decay of /sup 138/La and thus suggest the potential usefulness of the /sup 138/La//sup 138/Ce geochronometer. However, in order to reconcile the age of the samples inferred from the /sup 138/La//sup 138/Ce clock with that obtained from the well-established /sup 147/Sm//sup 143/Nd chronometer, these authors had to use a value of the /sup 138/La half-life approximately 16% less than the mean of the published values for this quantity. to justify the use of this shorter half-life, Tanaka and Masuda argued that the absorption of atmospheric H/sub 2/O and CO/sub 2/ by La/sub 2/O/sub 3/ probably led to overestimates of the amounts of La contained in samples used in /sup 138/La half-life determinations. Recently, however, we have reinvestigated the half-life and decay scheme of /sup 138/La using 99.999% pure La/sub 2/O/sub 3/ samples. Results are reported. (WHK)
- Research Organization:
- Washington Univ., Seattle (USA). Nuclear Physics Lab.
- DOE Contract Number:
- AC06-81ER40048
- OSTI ID:
- 6291334
- Report Number(s):
- DOE/ER/40048-33-L2; ON: DE83011483
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580100 -- Geology & Hydrology-- (-1989)
651722* -- Nuclear Properties & Reactions
A=90-149
Experimental-- Radioactive Decay-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AGE ESTIMATION
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY
CHALCOGENIDES
DATA
DECAY
ELECTRON CAPTURE DECAY
ELECTRON CAPTURE RADIOISOTOPES
ERRORS
EXPERIMENTAL DATA
HALF-LIFE
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPE DATING
ISOTOPE RATIO
ISOTOPES
LANTHANUM 138
LANTHANUM COMPOUNDS
LANTHANUM ISOTOPES
LANTHANUM OXIDES
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
RADIOISOTOPES
RARE EARTH COMPOUNDS
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
YEARS LIVING RADIOISOTOPES
580100 -- Geology & Hydrology-- (-1989)
651722* -- Nuclear Properties & Reactions
A=90-149
Experimental-- Radioactive Decay-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AGE ESTIMATION
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY
CHALCOGENIDES
DATA
DECAY
ELECTRON CAPTURE DECAY
ELECTRON CAPTURE RADIOISOTOPES
ERRORS
EXPERIMENTAL DATA
HALF-LIFE
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPE DATING
ISOTOPE RATIO
ISOTOPES
LANTHANUM 138
LANTHANUM COMPOUNDS
LANTHANUM ISOTOPES
LANTHANUM OXIDES
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
RADIOISOTOPES
RARE EARTH COMPOUNDS
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
YEARS LIVING RADIOISOTOPES