Sentences with phrase «of radioactive uranium»

Groundwater can be polluted not only from the heavy metals present in mine waste, but also from the traces of radioactive uranium still left in the waste.

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.

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.

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.

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.

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 artworks.

Shock waves from that meteorite impact deformed the minerals that made up the rock beneath the crater, including small, tough crystals that contain trace amounts of radioactive uranium and lead.

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.

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.

Centuries of research, tens of thousands of fossils unearthed, dated with the most reliable scientific methods (radioactive istopes such as Carbon - 14, potassium - argon, uranium - lead, etc), ample amounts of geological data, comparing rock formations from Africa and South America, from the British Isles and the Appalachians, coming to the evidence that these rocks were once united under the same continent (Pangaea, Gondwanaland, Rodinia, etc), etc, etc...

At issue is coal's content of uranium and thorium, both radioactive elements.

«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.

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.

She reckoned that a rare form of old «metal poor» star, one with one - thousandth the iron content of our own young sun, carries an internal clock, one composed of the radioactive elements uranium and thorium.

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.

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.

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.

If the fuel rods are no longer being cooled — as has happened at all three reactors at the Fukushima Daiichi power plant operating at the time of the earthquake — then the zirconium cladding will swell and crack, releasing the uranium fuel pellets and fission byproducts, such as radioactive cesium and iodine, among others.

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.

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.

Like mainstream reactors, it is a «light water» design: The reactor is pressurized and filled with plain water that flows past the core, where the radioactive decay of uranium - 235 generates intense heat.

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.

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.

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.

Her research shows that high - pressure fluids striking the shale could dislodge naturally occurring radioactive compounds such as uranium and strontium, putting groundwater at risk of contamination.

During the course of the experiment, the radioactive uranium may or may not emit a particle.

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

With four different uranium samples included — all labeled with fallout shelter - style «radioactive» stickers — the first sight of this 1951 kit still brings pop - eyed expressions.

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.

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.

The clusters of lead atoms formed 1 billion years after crystallization of the zircon, by which time the radioactive decay of uranium had formed the lead atoms that then diffused into clusters during reheating.

That plane was loaded with four hydrogen bombs when it went down on the sea ice near the Thule Air Base — 200 kilometers west of Camp Century — releasing radioactive elements including uranium and plutonium.

Jasim Ahmed, head of the IAEA radiation safety section, says the mission will concentrate on three issues: workers» health, the monitoring of their exposure to radiation, and management of the mine's radioactive «tailings», a mixture of uranium ore and processing liquids.

These contain traces of the radioactive elements uranium and thorium, which indicate when the deposits formed — and therefore give a minimum age for whatever lies beneath.

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.

Although the mining industry steadfastly claims uranium mining presents no significant risks of radioactive contamination, the fact that all of the Canyon's uranium mines are upstream of the Canyon floor makes contamination by mining waste inevitable.

zircon A gemstone that contains traces of the radioactive element uranium.

These contain traces of the radioactive elements uranium and thorium, which indicate when the deposits formed - and therefore give a minimum age for whatever lies beneath.