Sentences with phrase «uranium isotopes»
Uranium isotopes refer to different forms or versions of uranium. Isotopes are like different flavors of the same element. They have the same number of protons but different numbers of neutrons. Uranium, a heavy metal, has three main isotopes: uranium-238, uranium-235, and uranium-234. These isotopes are important because uranium-235 can be used as fuel in nuclear reactors or weapons, while uranium-238 is used to make depleted uranium for certain military applications. Full definition
By studying the variations of uranium isotopes recorded in carbonates, the team was able to infer global anoxia occurring throughout the ocean using samples from a single outcrop.
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1942 Sept 13The S - 1 Executive Committee recommends building a pilot plant based on Ernest O. Lawrence's cyclotrons to separate uranium isotopes in Tennessee.
The identified uranium isotope signatures could in future be used commercially to detect unknown uranium deposits and help understand processes of uranium mobility.
Achieving that longer lead time requires blocking Iran's four routes to nuclear weapons: through its Natanz and Fordow uranium enrichment facilities, where thousands of centrifuges separate uranium isotopes; through plutonium production at the Arak heavy water reactor, which Iran says is needed to produce medical radioisotopes; and by way of a covert path involving undisclosed facilities.
It was the first fissile Uranium isotope to be discovered.
Shale has a radioactive signature — from uranium isotopes such as radium - 226 and radium - 228 — that geologists and drillers often measure to chart the vast underground formations.
Overall, the tanks hold every element in the periodic table, including half a ton of plutonium, various uranium isotopes and at least 44 other radionuclides — containing a total of about 176 million curies of radioactivity.
A simulation of leaching over a range of acidity levels suggested that at low pH, uranium isotopes readily leached from drill cuttings, which raises questions as to whether uranium will seep into the environment from a landfill.
The resulting variations of uranium isotopes gave the team the answers they were looking for.
Uranium isotopes leave a distinct «fingerprint» in the sources of volcanic rocks, making it possible to gauge their age and origin.
The meteorites represent Earth's «building blocks» and, thus, yield the original uranium isotope composition of Earth as a whole, and also the undisturbed mantle.
The thorium mined at Baley is likely to have a different set of decay products than the uranium minerals (which typically contain a mix of uranium isotopes called «natural uranium» - or «u-nat» - a mixture of the isotopes uranium - 235, uranium - 234 and uranium - 238 commonly found in nature) mined at US, German and South Africa sites.
Francois Tissot works hard to measure and understand Uranium isotopes in rocks and meteorites to learn about the early Solar System and early Earth.
You look for rocks of appropriate age, which we can determine by measuring radioactive uranium isotopes and their products in the volcanic rocks interspersed with them, and study their composition.
It is the only fissile Uranium isotope being able to sustain nuclear fission.
Look up radiometric dating of uranium isotopes.
Francium — an element created as a uranium isotope decays into lead — typically survives only 23 minutes before turning into either astatine or radon.
How long — I mean the idea is that the uranium isotopes are a slightly different weight.
Geologists have gained a new understanding of how Earth's crust is recycled back into its interior based on these uranium isotopes.
A new study of the global cycle of these uranium isotopes brings additional perspectives to the debate on how Earth has changed over billions of years as revealed in a recently published study in the journal Nature.
The specific «fingerprint» derived from the ratio of the uranium isotopes, relates to uranium oxidation processes at Earth's surface.
The study by Andersen and his colleagues is the first to use the uranium isotope ratio for the examination of igneous rock and apply it to the recycling process in deep Earth.
The ratio of the uranium isotopes in MORBs can be compared with those found in ocean island basalts in places such as Hawaii and the Canary Islands.
«The radioactive nature of uranium isotopes has long been key in reconstructing early Earth history, but we now see that they also have another story to tell» explains Morten Andersen, a geochemist in the Department of Earth Sciences at ETH Zurich.
For this work, conducted at the University of Bristol including Morten Andersen (now Earth Science, ETH Zurich) along with researchers from the Durham (UK), Wyoming and Rhode Island (US), used the «fingerprint» carried in the ratio of the two uranium isotopes.
In particular, the researchers found that a higher ratio of uranium - 238 to uranium - 235 is incorporated into the modern oceanic crust, when compared to the uranium isotope signature found in meteorites.
So, despite the oceanic crust having been transported into Earth's mantle for a long time, the uranium isotope ratio of the subducted oceanic crust first differed from Earth's mantle only after the full oxidation of the oceans.
This uranium isotope «fingerprint» of the altered oceanic crust provides a way to trace uranium that has moved from the surface and back into Earth's interior through subduction.
The fuel starts out as a mixture of uranium isotopes, and the plutonium isotopes are «bred» in place.
Specifically, the team analyzed the variations of the uranium isotopes found in these sedimentary deposits.