| Autor: |
A.M. Essling, A.H. Jaffey, K.F. Flynn, D.J. Rokop, W.C. Bentley, Herbert Diamond, J. Williams |
| Rok vydání: |
1978 |
| Předmět: |
|
| Zdroj: |
The International Journal of Applied Radiation and Isotopes. 29:505-507 |
| ISSN: |
0020-708X |
| DOI: |
10.1016/0020-708x(78)90007-8 |
| Popis: |
Two nearly independent methods have been used for measuring the half life of 239Pu. In one, the alpha-particle activity of a known mass of plutonium of known isotopic composition (>99.9% 239Pu) was measured using a defined-solid-angle alpha-particle counter; the other method involved measuring the mass of the daughter 235U grown into a known mass of 239Pu, using isotope-dilution mass spectrometry with 233U and 238U as independent spikes. The concentrations of the plutonium solution and of the two uranium spike solutions were measured by oxidation-reduction titration. The mean half-life value determined by alpha-particle counting was 24,124.2±13.6yr and that determined by isotope-dilution mass spectrometry was 24,138.6±13.7yr, giving an overall average value of 24,131±16yr. (The uncertainties are one standard deviation.) |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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