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Light mass elements total half-lives for selected long-lived nuclides

Conference ·
OSTI ID:5400477
In the past, many compilations and evaluations of half-lives have been made which have uncritically accepted authors' values and uncertainties. They have merely recommended weight-averaged reported results. This evaluation attempts to reanalyze each experiment in the literature including an estimate of the standard deviation utilizing, where possible, an estimate of the systematic error. This paper constitutes a preliminary step in the process of recommending values. The long-lived nuclides of light elements are of interest for their use in dating methods and for calculating cosmic-ray exposure ages of meteorites. Experimental data on the half-lives of selected nuclides have been evaluated and recommended values and uncertainties are presented for the following nuclides: /sup 3/H, /sup 10/Be, /sup 14/C, /sup 26/Al, /sup 39/Ar, /sup 40/K, /sup 50/V, /sup 53/Mn, /sup 76/Ge, /sup 87/Rb, /sup 92/Nb, /sup 107/Pd, /sup 113/Cd, /sup 115/In and /sup 123/Te. The impact of the recommended /sup 14/C half-life of 5715 years on the carbon dating technique, which uses the Libby value of 5568 years, will be discussed. Also the possible primordial occurrence of /sup 92/Nb is now definitely ruled out by the recommended half-life of 3.7 x 10/sup 7/. Finally, based on the recommended /sup 26/Al half-life value, the /sup 21/Ne production rate for calculating cosmic-ray exposure ages remains too high, compared to rates using the /sup 53/Mn and /sup 10/Be half-life values. 15 tabs.
Research Organization:
Brookhaven National Lab., Upton, NY (USA)
DOE Contract Number:
AC02-76CH00016
OSTI ID:
5400477
Report Number(s):
BNL-NCS-36553; CONF-8506130-4; ON: DE85014217
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ALKALINE EARTH ISOTOPES
ALUMINIUM 26
ALUMINIUM ISOTOPES
ARGON 39
ARGON ISOTOPES
BERYLLIUM 10
BERYLLIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CADMIUM 113
CADMIUM ISOTOPES
CARBON 14
CARBON ISOTOPES
DATA
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
EVALUATED DATA
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GERMANIUM 76
GERMANIUM ISOTOPES
HALF-LIFE
HOURS LIVING RADIOISOTOPES
HYDROGEN ISOTOPES
INDIUM 115
INDIUM ISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
MANGANESE 53
MANGANESE ISOTOPES
NIOBIUM 92
NIOBIUM ISOTOPES
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
PALLADIUM 107
PALLADIUM ISOTOPES
POTASSIUM 40
POTASSIUM ISOTOPES
RADIOISOTOPES
RUBIDIUM 87
RUBIDIUM ISOTOPES
SECONDS LIVING RADIOISOTOPES
STABLE ISOTOPES
TELLURIUM 123
TELLURIUM ISOTOPES
TRITIUM
VANADIUM 50
VANADIUM ISOTOPES
YEARS LIVING RADIOISOTOPES