Produção Nacional
Revisado por pares
New evaluation of alpha decay half-life of 190Pt isotope for the Pt–Os dating system
2005; Elsevier BV; Volume: 243; Issue: 1 Linguagem: Inglês
10.1016/j.nimb.2005.08.122
ISSN1872-9584
AutoresO. A. P. Tavares, Maria Letizia Terranova, E. L. Medeiros,
Tópico(s)Radioactive element chemistry and processing
ResumoA semiempirical model based on the quantum mechanical tunnelling mechanism of alpha emission from nuclei has been used to evaluate the half-life of the Pt isotopes. For the important naturally occurring 190Pt isotope, the radiogenic parent in the 190Pt → 186Os dating system, the model yielded a half-life-value of (3.7 ± 0.3) × 1011 y. This is comparable to (3.2 ± 0.1) × 1011 y which was obtained in the last direct counting experiment to measure the alpha activity of 190Pt [O.A.P. Tavares, M.L. Terranova, Radiat. Meas. 27 (1997) 19]. A literature survey of available alpha decay half-life values for 190Pt isotope is also reported. The significant discrepancies found between data obtained by direct counting, indirect geological methods and different calculation models are analysed and discussed.
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