期刊
NEW ASTRONOMY REVIEWS
卷 48, 期 1-4, 页码 161-164出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.newar.2003.11.023
关键词
accelerator mass spectrometry; extinct radioactivities; (182)Hf; ISM
The presence of live (182)Hf (t(1/2) similar to 9 Myr) in the early solar system is well established but the understanding of its abundance is still challenging. Live (182)Hf is expected to be present in the interstellar medium (ISM) as a result of recent nucleosynthesis activity. We are attempting a search for live (182)Hf possibly deposited on Earth. The search focuses on deep-ocean sediments and a method for chemical extraction of the Zr-Hf fraction from sediments has been developed. The detection of (182)Hf is performed at the Vienna Environmental Research Accelerator (VERA). Measurements of Hf and W isotopic abundances for the Zr-Hf fraction extracted from deep-sea sediment samples were performed. Present limits for the (182)Hf abundance derived from the measured isotopic abundances are discussed. (C) 2003 Elsevier B.V. All rights reserved.
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