Sentences with phrase «with 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.

Not exact matches

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.

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.

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.

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

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

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.

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.

But these clocks are constrained in how precisely they can divide time because when caesium electrons jump from a certain state to another they emit radiation with a frequency of only 9 giga - hertz, or 9 billion cycles per second.

«With appropriate controls, the caesium - chloride - gradient data would constitute a relatively definitive refutation, at least for most scientists,» he wrote in an e-mail to Nature.

Storm dates were determined by matching key markers in the sediment samples with known events; rye pollen started to appear after Europeans colonized the region, for example, and exotic caesium isotopes settled in the pond following nuclear weapons tests.

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An estimated 50 million gallons of liquid wastes from Cold War plutonium production processes - laced with radioactive caesium and strontium salts - were dumped in a 13.7 sq. mile area south of central Hanford's 177 underground radioactive waste tanks.