Sentences with phrase «own caesium»

Their experiment works by dropping caesium atoms above an aluminium sphere.

The Greenbushes pegmatites belong to the Lithium - Caesium - Tantalum family.

In October 2004, the first quantum memory component was built from a string of caesium atoms.

Wheat leaves that were open at the time of the greatest fallout were heavily contaminated, with combined levels of caesium - 134 and caesium - 137 ranging from thousands to about 1 million Bq kg - 1.

The NPL's atomic clocks measure how often a caesium atom's electrons jump between two energy levels — a little more than 9 billion jumps equal one second.

The second is currently defined by caesium atomic clocks, but optical clocks promise higher precision because their atoms oscillate at the frequencies of light rather than in the microwave band, so they can slice time into smaller intervals.

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

Using an interferometer, the team split a beam of caesium atoms into two.

They exploit the fact that an atom of caesium, or some other element, emits visible light or microwaves when one of its electrons drops from a high energy state to a lower one.

«The trigger for closing the trap comes from the caesium - sulphide interactions in the material,» says Kanatzidis.

It was previously thought that only volatile, gaseous radionuclides such as caesium and iodine were released from the damaged reactors.

Once inside, the caesium bonds with sulphide ions, and this changes the material's structure in a way that closes the windows and traps the caesium.

The researchers discovered uranium from nuclear fuel embedded in or associated with caesium - rich micro particles that were emitted from the plant's reactors during the meltdowns.

This study concerns the LLFPs selenium - 79, zirconium - 93, technetium - 99, palladium - 107, iodine - 129 and caesium - 135.

They also have filtered venting systems so that even if cooling fails and pressure starts to build in the containment building, radioactive iodine and caesium can be removed from the steam before it is released.

Radioactive caesium isotopes are being removed from the water by an advanced liquid - processing system built after the accident, but a facility for removing strontium isotopes is not yet ready.

This is fissile, and splits into lighter fragments, including isotopes such as caesium - 137, with a half - life of 30 years, and strontium - 90, with a 25 - year half - life.

In the 1990s, a team led by Nobel laureate Steven Chu made an «atomic fountain» of caesium atoms, launching them 30...

Molten salt from the electro - refining, which contains only fission products such as caesium and strontium, is mixed with cement for storage.

Caesium and strontium had already been removed.

Others aren't so sure: the two highest caesium hotspots also carried 45 MBq / m2 and 57 MBq / m2, respectively, of iodine - 131, and others also had high levels of iodine - 131.

MEXT, the Japanese science ministry, has been monitoring radioactive iodine and caesium, considered most harmful to health, in soil 25 to 58 kilometres from the plant since 18 March.

After the 1986 Chernobyl accident, the level of caesium contamination at which evacuation was mandatory was 1.48 MBq / m2.

At Fukushima Daiichi, only the volatile elements, such as iodine and caesium, are bubbling off the damaged fuel.

The Chernobyl accident emitted much more radioactivity and a wider diversity of radioactive elements than Fukushima Daiichi has so far, but it was iodine and caesium that caused most of the health risk — especially outside the immediate area of the Chernobyl plant, says Malcolm Crick, secretary of a United Nations body that has just reviewed the health effects of Chernobyl.

Caesium is absorbed by muscles, where its half - life of 30 years means that it remains until it is excreted by the body.

Similarly, says Wotawa, caesium - 137 emissions are on the same order of magnitude as at Chernobyl.

Moreover the human body absorbs iodine and caesium readily.

Japan's damaged nuclear plant in Fukushima has been emitting radioactive iodine and caesium at levels approaching those seen in the aftermath of the Chernobyl accident in 1986.

The Sacramento readings suggest it has emitted 5 × 1015 becquerels of caesium - 137 per day; Chernobyl put out 8.5 × 1016 in total — around 70 per cent more per day.

The daily amount of caesium - 137 released from Fukushima Daiichi is around 60 per cent of the amount released from Chernobyl.

A new generation of atomic tickers, known as optical clocks, have just wrested the record for accuracy from the ensembles of oscillating caesium atoms that held it for half a century.

Research at the Institute of Grassland and Environmental Research in Aberystwyth has found that spreading certain minerals over contaminated land can fix caesium in the soil, preventing plants from taking it up.

Hills and uplands in Wales and northwestern England could soon turn from green to navy blue as scientists try to «lock up» radioactive caesium deposited by rain after the Chernobyl disaster.

The pair hit two caesium atoms with rapid pulses of laser light.

The biggest culprit is caesium - 137 which is being taken up by plants.

Caesium concentrations in plants growing in areas treated with the potassium salt fell sharply, but the substance also acted as a fertiliser.

Caesium atoms contain electrons that orbit a nucleus, and it is possible for the direction of an electron's spin to become entangled with that of the nucleus's spin.

Ken Buesseler of the Woods Hole Oceanographic Institution in Massachusetts says Kanda's estimate is probably the best he is aware of, and closely matches figures released on 21 August by Tepco, of between 0.1 and 0.6 TBq per month for caesium - 137 and 0.1 to 0.3 for strontium.

He points out that the north Pacific contains an estimated 100,000 TBq of caesium - 137 from H - bomb testing in the 1960s, so the fallout from Fukushima is adding only a fraction of that.

Caesium - 137 has a half - life of 30 years and, he says, if no action is taken, government controls on sheep grazing the affected areas will have to stay «for the foreseeable future».

Buesseler says that during his own sampling survey in waters 30 to 600 kilometres from Fukushima in June 2011, three months after the meltdown, the highest levels he found were 3 Bq of caesium - 137 per litre of seawater.

After filtering to remove radioactive caesium, Tepco stores the water — huge volumes of it — in 1060 tanks, each holding up to 1000 tonnes.

Jessen's team searched for signs of chaos within a set of cooled caesium atoms, using them as the quantum equivalent of an everyday object that displays chaotic behaviour — a child's spinning top.

Ruff, who was in Paris last week as part of a last - ditch attempt by members of International Physicians for the Prevention of Nuclear War to stop the tests, says that 60 underground tests have been carried out by the French since the 1983 scientific visit and that in 1987 scientists found caesium - 137 on Mururoa.

Timekeeping institutes around the world each have their own caesium clocks.

And because hydrogen molecules consist of just a handful of particles, compared with the larger caesium atoms used in atomic clocks, it would be easier to do theoretical calculations and compare them with real experiments, the team says.

The two clocks, one based on caesium atoms and the other on hydrogen, will communicate with a network of clocks back on Earth to compare performance across continents at a level that is equivalent to 10 trillionths of a second.

«Leakage is occurring and isotopes such as caesium - 137 accumulate in the food chain.»

The standard clock uses caesium atoms, which emit microwaves precisely 9,192,631,770 times per second.