Results 21 to 30 of about 2,681 (235)

Radiogenic Lead with Dominant Content of 208Pb: New Coolant and Neutron Moderator for Innovative Nuclear Facilities

Science and Technology of Nuclear Installations, 2011
As a rule materials of small atomic weight (light and heavy water, graphite, and so on) are used as neutron moderators and reflectors. A new very heavy atomic weight moderator is proposed—radiogenic lead consisting mainly of isotope 208Pb.
A. N. Shmelev, G. G. Kulikov, V. A. Apse, E. G. Kulikov, V. V. Artisyuk   +4 more
doaj   +1 more source

Characterization of Nd Radiogenic Isotope Signatures in Sediments From the Southwestern Atlantic Margin

Frontiers in Earth Science, 2018
Based on radiogenic isotope systems of neodymium [Epsilon Neodymium-εNd(0), 143Nd/144Nd, 147Sm/144Nd, and Sm-Nd Depleted Mantle Model ages-TDM] from current and previous data of continental rocks and associated sediments, this work provides the ...
Simone S. Mantovanelli, Colombo C. G. Tassinari, Michel M. De Mahiques, Michel M. De Mahiques, Luigi Jovane, Everton Bongiolo   +5 more
doaj   +1 more source

Novel nannofossils extraction methods from paintings, coupled with GC–MS for provenance determination and binder analysis

Heritage Science, 2022
The use of calcareous nannofossils for provenance analysis is a new-old topic for cultural heritage. Several studies have already mentioned it for ceramic, but less for paintings.
Victory Armida Janine Jaques, Jakub Trubač, Jiří Rathouský, Tomáš Cajthaml, Katarína Holcová   +4 more
doaj   +1 more source

U-Pb ages and Nd isotope characteristics of the lateorogenic, migmatizing microcline granites in southwestern Finland [PDF]

Bulletin of the Geological Society of Finland, 2005
U-Pb ages and whole-rock Nd isotope data have been obtained from the Paleoproterozoic lateorogenic migmatizing microcline granites of southwestern Finland.
M. Kurhila, M. Vaasjoki, I. Mänttäri, T. Rämö, M. Nironen   +4 more
doaj   +1 more source

Continental weathering as the source of iron in Jurassic iron oolites from Switzerland

Swiss Journal of Geosciences, 2023
Iron is extremely insoluble in oxic seawater. The lack of a large aqueous reservoir means that sediments rich in authigenic iron are rare in the modern ocean.
Stefan Schunck, Jörg Rickli, Stephan Wohlwend, Helmut Weissert, Derek Vance   +4 more
doaj   +1 more source

The Capitanian Minimum: A Unique Sr Isotope Beacon of the Latest Paleozoic Seawater

Frontiers in Earth Science, 2021
The long-term trend in the Paleozoic seawater 87Sr/86Sr was punctuated by a unique episode called the “Capitanian minimum” at the end of the Guadalupian (Permian; ca. 260 Ma).
Tomomi Kani, Yukio Isozaki
doaj   +1 more source

Glacial–interglacial Nd isotope variability of North Atlantic Deep Water modulated by North American ice sheet

Nature Communications, 2019
The Nd isotope composition of seawater has been used to reconstruct past changes in the various contributions of different water masses to the deep ocean, with the isotope signatures of endmember water masses generally assumed to have been stable during ...
Ning Zhao, Delia W. Oppo, Kuo-Fang Huang, Jacob N. W. Howe, Jerzy Blusztajn, Lloyd D. Keigwin   +5 more
doaj   +1 more source

C, O, and Sr isotopic variations in Neoproterozoic-Cambrian carbonate rocks from Sete Lagoas Formation (Bambuí Group), in the Southern São Francisco Basin, Brazil

Brazilian Journal of Geology, 2017
: High-resolution chemostratigraphic data of carbonates from the Sete Lagoas Formation (Bambuí Group) show large variations on the C, O, and Sr isotope compositions.
Cristian Guacaneme, Marly Babinski, Gustavo Macedo de Paula-Santos, Antonio Carlos Pedrosa-Soares   +3 more
doaj   +1 more source

Mg and Li Stable Isotope Ratios of Rocks, Minerals, and Water in an Outlet Glacier of the Greenland Ice Sheet

Frontiers in Earth Science, 2019
Magnesium and lithium stable isotope ratios (δ26Mg and δ7Li) have shown promise as tools to elucidate biogeochemical processes both at catchment scales and in deciphering global climate processes.
Ruth S. Hindshaw, Jörg Rickli, Julien Leuthold   +2 more
doaj   +1 more source

Cosmogenic and Radiogenic Isotopes [PDF]

Nature, 1964
Radioactive Dating (Proceedings of the Symposium held by the International Atomic Energy Agency in co-operation with the Joint Commission on Applied Radioactivity (ICSU) in Athens, 19–23 November 1962.) (Proceedings Series.) Pp viii + 440. (Vienna : International Atomic Energy Agency; London: H.M.
openaire   +1 more source