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Title: Natural occurrence of lanthanides, actinides, and superheavy elements

Natural occurrence of lanthanides, actinides, and superheavy elements While it is possible to synthesize transuranium elements up to proton number of Z = 105, only a small success can be reported on naturally occurring transuranium nuclides. Only extremely small quantities of primordial plutonium- 244, the longest-llved transuranium nuclide, have been detected in the cerium- rich Californian mineral bastnaesite, which means that plutonium must be considered as a naturally occurring and not as an artificial element. Promethium- 147, plutonium-239, and neptunium-237, detected in several minerals and identified by ucts. No other transuranium nuclides and no superheavy elements could be found in terrestrial, lunar, and meteoritic probes. Investigations on the anomalous isotopic composition of uranium in ores from Oklo./Gabon led to a scientific sensation: a prehistoric natural nuclear reactor, working about 10/sup 9/ years ago, which showed much similarity in comparison with modern nuclear power reactors. (GE)
Authors:
Publication Date:
OSTI Identifier:OSTI ID: 4353086
Resource Type:Journal Article
Resource Relation:Journal Name: Chem. Ztg., v. 97, no. 10, pp. 522-530; Other Information: Orig. Receipt Date: 30-JUN-74; Bib. Info. Source: GE (GE)
Research Org:Kernforschungszentrum, Karlsruhe, Ger.
Country of Publication:Germany
Language:English
Subject: N44100* --Environmental & Earth Sciences--Minerals & Ores; N40420 --Chemistry--Radiochemistry & Nuclear Chemistry--Properties of Radioactive Materials; *ACTINIDES-- NATURAL OCCURRENCE; *RARE EARTHS-- NATURAL OCCURRENCE; *TRANS 104 ELEMENTS-- NATURAL OCCURRENCE; GABON; ISOTOPE RATIO; LUNAR MATERIALS; METEORITES; MINERALS; NEPTUNIUM 237; ORES; PLUTONIUM 239; PLUTONIUM 244; PROMETHIUM 147; URANIUM