Sentences with phrase «uranium isotopes in»

Francois Tissot works hard to measure and understand Uranium isotopes in rocks and meteorites to learn about the early Solar System and early Earth.

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.

Not exact matches

Radioactive isotopes of elements such as uranium, potassium, and thorium are found in a class of rocky meteorites known as chondrites.

The water contains a smattering of uranium atoms that decay into a distinctive isotope of thorium, which accumulates in the calcite over millennia.

Knowing that uranium and thorium decay into two lead «isotopes» — which can be distinguished by their different physical properties — Soddy later measured the atomic weights of this stable element in ores rich in uranium and thorium, and found that they were 206.08 and 207.69, respectively.

Those segments with potentially hazardous amounts of uranium - 235, the fissile isotope of uranium used in nuclear reactors and weapons, will be removed and decontaminated.

Most nuclear reactors use uranium fuel that has been «enriched» in uranium 235, an isotope of uranium that fissions readily.

Uranium - 235 (U-235) is an isotope of uranium widely used for nuclear power generation and, like all other radioactive isotopes used in medicine, it has been also employed for diagnosis and treatment of diseased organs and Uranium - 235 (U-235) is an isotope of uranium widely used for nuclear power generation and, like all other radioactive isotopes used in medicine, it has been also employed for diagnosis and treatment of diseased organs and uranium widely used for nuclear power generation and, like all other radioactive isotopes used in medicine, it has been also employed for diagnosis and treatment of diseased organs and tumors.

In nature, uranium occurs as a mixture of two isotopes, the easily fissionable uranium 235 (which is said to be «fissile») and the much more stable uranium 238.

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.

In the 1980s the antineutrino spectra of three main fuel isotopes, uranium 235, plutonium 239 and plutonium 241, were determined.

A few studies have found naturally occurring radioactive materials in the solid waste, but the research only focused on several long - lived radioactive isotopes including uranium - 238 and radium - 226.

The concentration of this isotope must therefore be boosted in natural uranium before it can function as nuclear power plant fuel.

By applying uranium - thorium dating to the corals and measuring ratios of oxygen isotopes in their skeletons, her lab reconstructed ocean temperatures for much of the last 7000 years.

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.

The identified uranium isotope signatures could in future be used commercially to detect unknown uranium deposits and help understand processes of uranium mobility.

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.

Uranium isotopes leave a distinct «fingerprint» in the sources of volcanic rocks, making it possible to gauge their age and origin.

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 meteoriteIn 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 meteoritein meteorites.

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.

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.

The fuel starts out as a mixture of uranium isotopes, and the plutonium isotopes are «bred» in place.

Using techniques including uranium - thorium dating in UQ's Radiogenic Isotope Laboratory researchers were able to determine when the corals had died with a precision of up to one to two years.

The researchers determined the depositional age of the two stalagmites, collected in Qal» e Kord Cave in central northern Iran, using a technique called uranium - thorium geochronometry conducted in the UM Rosenstiel School's Neptune Isotope Lab.

Radioactive dating of the uranium and lead found in the minerals (and organic carbon and light isotope carbon (C13) in bulk - rock carbonates) within the trace fossils that bacteria etched into the glass around 3.342 + / - 0.068 billion years ago (Jonathan Amos, BBC News, October 12, 2010; Fliegel et al, 2010; Grosch et al, 2009; and Furnes et al, 2004).)

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.

Uranium series is also known as uranium thorium (UT) dating and relies upon various frabctiond of the isotope U230 in the Uranium series is also known as uranium thorium (UT) dating and relies upon various frabctiond of the isotope U230 in the uranium thorium (UT) dating and relies upon various frabctiond of the isotope U230 in the sample.

«Highly enriched uranium» (HEU) is made for use in nuclear weapons and is created when the content of uranium - 235 (U-235), the isotope of uranium that is fissionable and therefore necessary to make nuclear weapons and nuclear reactor fuel, is enriched.

Fast neutrons can unlock the energy in the dominant isotope of uranium (U238) and thus extend known fuel resources by around 200x.

Uranium - series uses the decay of uranium and thorium isotopes (238U, 235U and 232Th) in calcites in particular, such as stalactites and stalagmites inUranium - series uses the decay of uranium and thorium isotopes (238U, 235U and 232Th) in calcites in particular, such as stalactites and stalagmites inuranium and thorium isotopes (238U, 235U and 232Th) in calcites in particular, such as stalactites and stalagmites in caves.

Uranium - 235 is the only fissile radioactive isotope which is a primordial nuclide existing in the nature in its present form since before the creation of Earth.

Uranium dating is one of the ways of determining the age of ancient objects, even one million years old, by measuring how much of the following are present in them: the amount of radioactive isotopes of uranium, and the amount of other materials into which the radioactive isotopes would decUranium dating is one of the ways of determining the age of ancient objects, even one million years old, by measuring how much of the following are present in them: the amount of radioactive isotopes of uranium, and the amount of other materials into which the radioactive isotopes would decuranium, and the amount of other materials into which the radioactive isotopes would decompose.

Precisely the situation you outline is present in all of the world's high - speed centrifuges containing uranium hexafluoride (UF6) for isotope separation.

Just to reiterate, this experiment is being conducted, tens of thousands of times every day, in the gas centrifuges used for uranium isotope separation, which generate g - forces sufficiently large that the on - axis pressure is a near - vacuum, which the outer - rim pressure is many atomospheres — precisely the conditions of interest.

By comparing the ratio of protactinium - 231 to thorium - 230, two daughter isotopes of uranium decay that remain in seawater for relatively short but consistently different periods of time before drifting into the seafloor, they could determine when circulation was strongest.

Specifically, the team analyzed the variations of the uranium isotopes found in these sedimentary deposits.

«Iodine - 129 (129I; half - life 15.7 million years) is a product of cosmic ray spallation on various isotopes of xenon in the atmosphere, in cosmic ray muon interaction with tellurium - 130, and also uranium and plutonium fission, both in subsurface rocks and nuclear reactors.

Thorium is better because it has to absorb five neutrons before it will turn into a transuranic isotope, whereas common uranium only has to absorb one - a built in buffer.