Sentences with phrase «radioactive uranium in»

Instead, this «gold mine bug» gets energy from radioactive uranium in the depths of the mine.

A patina of calcite coated the fragment, and the researchers used radioactive uranium in the mineral to date the bone to about 55,000 years old.

Analyses of thin mineral deposits partly covering painted cave areas provided minimum age estimates for the art, based on known decay rates of radioactive uranium in the rock.

Not exact matches

The department controls the radioactive materials - plutonium, uranium and tritium - used in Americas nuclear weapons and in the reactors of nuclear - powered aircraft carriers and submarines.

Carcinogenic, radioactive elements such as uranium and plutonium are too impractical, as are synthetic elements that exist only momentarily in lab experiments — seaborgium and einsteinium, for example.

Since these elements exist only for a definite span of years, and all the uranium, radium, thorium and other radioactive elements in the world today have not yet existed that many years, there was a time, prior to the duration of this span in the past, when these elements DID NOT EXIST!

These include adequate uranium supply (probably necessitating immense uranium strip mines in Tennessee), almost inconceivable reactor and waste - transport accidents, low - level radiation effects from normal plant operations, and the burden of guarding both radioactive waste and outdated but radioactive nuclear plants for thousands of years.

Uranium and other radioactive materials, such as caesium and technetium, have been found in tiny particles released from the damaged Fukushima Daiichi nuclear reactors.

«About 20 percent of the helium is coming from the moon itself, most likely as the result from the decay of radioactive thorium and uranium, also found in lunar rocks,» said Benna.

Age estimates relied on measures of the decay of radioactive forms of argon and uranium in volcanic ash layers framing tool - bearing sediment.

The slag, which typically includes some radioactive uranium and radium in addition to calcium minerals, is the waste product from the conversion of phosphate ore to phosphorus.

Visible from space, the Bayan — Obo iron mine in Inner Mongolia is the world's largest source of rare earths, and the Chinese companies supplying them employ acid to dissolve them out of ore rock that often also contains radioactive elements like thorium, radium or even uranium.

In these regions they found zircons, hardy little crystals that are valued because they suck up enough radioactive uranium to be used for dating.

They then applied a precise dating technique based on natural radioactive decay of uranium, as Urs Schaltegger added: «In the sedimentary cross-sections, we found layers of volcanic ash containing the mineral zircon which incorporates uranium.

Dating relied on measures of the decay of a radioactive form of uranium in the human fossil and a nearby hippo tooth.

Uranium, the radioactive element that fuels nuclear power plants and occurs naturally in the Earth's crust, is typically mined from large sandstone deposits deep underground.

What is more, the uranium atoms that have already split in two produce radioactive by - products that themselves give off a great deal of heat.

In particular, a relatively new form of nuclear technology could overcome the principal drawbacks of current methods — namely, worries about reactor accidents, the potential for diversion of nuclear fuel into highly destructive weapons, the management of dangerous, long - lived radioactive waste, and the depletion of global reserves of economically available uranium.

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.

The waste liquid in this image is the result of processing raw phosphate with sulphuric acid; it can be both acidic and faintly radioactive due to uranium that is found with phosphate ore.

In June archaeologist Alistair Pike, now at the University of Southampton, described a clever way to get answers: Analyze the breakdown of radioactive uranium - 234 embedded in the natural mineral crust that forms on top of the artworkIn June archaeologist Alistair Pike, now at the University of Southampton, described a clever way to get answers: Analyze the breakdown of radioactive uranium - 234 embedded in the natural mineral crust that forms on top of the artworkin the natural mineral crust that forms on top of the artworks.

The Hebrew University team of scientists have shown that these contradicting observations can be reconciled if the source of radioactive plutonium (as well as other rare elements, such as gold and uranium) is in mergers of binary neutron stars.

For ores that contain even less concentrated uranium — McArthur River is the most concentrated active mine — the proportion of waste in radium and other radioactive elements (as well as toxic heavy metals such as arsenic and mercury) is even higher — and McArthur River's uranium is much less concentrated than the mines of the past like nearby Rabbit Lake or Shinkolobwe in the Democratic Republic of the Congo's Katanga Province.

For every metric ton of uranium ore pulled from McArthur River, roughly one metric ton of waste rock, often radioactive and rich in toxic heavy metals, is produced — and other mines produce even more waste rock per ton of ore.

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.

Deep underground, uranium atoms in rocks undergo radioactive decay, sending off alpha particles — two protons and two neutrons — that can bump into other molecules and change them.

But uranium - lead dating, in which researchers estimate the age of a rock by comparing its concentrations of radioactive uranium and the lead it decays into, tells a different story.

Milling that metric ton from McArthur, which is reported to be roughly 20 percent uranium, would then result in 440 pounds (200 kilograms) of yellowcake and 1,765 pounds (800 kilograms) of toxic, radioactive tailings, at best.

The machines handle the decaying element's radiation better than human miners and can tolerate the radon gas released by the ore; early Navajo miners of uranium in the U.S. — and their families exposed to residual radioactive dust and debris as well as contaminated water — developed lung cancer and other ailments by the 1970s and 1980s.

Whether the uranium is stripped out of an open pit like the Ranger mine in Australia, removed from deep underground like McArthur River or chemically leached from its rocky home as at the Smith Ranch - Highland mine in Wyoming (the largest mine in the U.S.), yellowcake is the end product, along with a heap of radioactive tailings and, often, contaminated water.

Entombed within a highly restricted Superfund dump in Utah's Great Salt Lake Desert, alongside several tons of radioactive residue from atomic bomb factories and uranium mines, is a small chemistry experiment constructed in 1995 by an aspiring Eagle Scout from suburban Detroit.

Those stainless steel drums contain metal - clad spent uranium embedded in concrete, and they are highly radioactive.

Williams looked at the radioactive elements uranium and thorium trapped in these calcite crystals, using them as a kind of clock based on the rate at which uranium decays into thorium.

These measurements may also shed light on the proportion of radioactive elements like uranium and thorium inside the Moon, since their decay produces heat and should increase the amount of heat radiated by the Moon, says Paul Spudis of the Johns Hopkins University Applied Physics Laboratory in Laurel, Maryland, US, who is developing radar instruments to fly on LRO and Chandrayaan - 1.

This happened in 1986 when a nuclear power plant at Chernobyl caught fire and exploded, showering surrounding territory with radioactive particles and threatening to let molten uranium fuel seep deep into the ground.

They made use of uranium - 233 as a source of Th - 229m, which is produced in the radioactive alpha decay of uranium - 233.

Nitrate mobilizes naturally occurring uranium through a series of bacterial and chemical reactions that oxidize the radioactive mineral, making it soluble in groundwater.

In late 2008, samples of Chico's municipal drinking water were found to contain radium, a radioactive derivative of uranium and a common attribute of drilling waste.

The indoor radon action levels for US homes and schools were adopted in response to the use of radioactive uranium mill tailings sand in construction and soil fill for homes and schools in the western US; recognized in the 1970's as one of the first direct community health risks from the process of uranium mining.

Uranium and other radioactive holdovers from weapons production reside under the Site, in southeastern Washington State.

One man said that information given in the presentation confirmed what he had feared for many years: that livestock that graze and drink water in uranium mining areas can accumulate radioactive substances and heavy metals in their edible muscle and organs in levels that may harm the animals themselves and that could contribute to excessive doses in the people who eat the livestock meat.

Among the dozens of radioactive substances naturally present in seawater (of which cesium - 137 is one), uranium - 238 and potassium - 40 are the ones present in the greatest abundance.

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.

This radioactive metal is sometimes used in the production of nuclear weapons as a substitute for depleted Uranium.

In contrast, super-Earths with a similar concentration but larger absolute amount of radioactive heat sources (i.e., uranium and thorium) than Earth would produce more internal heat, more vigorous mantle convection, and faster plate tectonic action involving thinner plates, which may promote planetary habitability with lower mountain ranges but higher volcanic activity and an atmosphere with a greater relative composition of volcanic and lighter gases (Sasselov and Valencia, Scientific American, August 2010; Valencia and O'Connell, 2009; and Valencia et al, 2007).

Radon is a radioactive, odorless, colorless gas that comes out of the ground in areas that have high levels of decaying uranium.

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.

Radiometric or radioactive dating steps jump to radioactive decay radiometric dating formula example of a radioactive uranium lead dating decay chain from lead - radiometric or radioactive dating steps step in such a chain is characterized by a distinct half - life.

Radon gas comes from radioactive elements (uranium and radium) present in soil.

Crystal Palace: The Great Exhibition of the Works of Industry of All Nuclear Nations by Japanese pair Ken and Julie Yonetani underscores the global proliferation of nuclear - generating nations through the use of radioactive uranium glass; Bounpaul Phothyzan «s We Live (2013) is a site - specific exploration of politicized environmental damage in Bolikhamxay Province in Laos.