cesium


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cesium

 (Cs) [se´ze-um]
a chemical element, atomic number 55, atomic weight 132.905. (See Appendix 6.)

ce·si·um (Cs),

(sē'zē-ŭm),
A metallic element, atomic no. 55, atomic wt. 132.90543; a member of the alkali metal group. 137Cs (half-life equal to 30.1 years) is used in the treatment of certain malignancies.
[L. caesius, bluish gray]

cesium

/ce·si·um/ (Cs) (se´ze-um) a chemical element, at. no. 55.

cesium (Cs)

[sē′zē·əm]
Etymology: L, caesius, sky blue
an alkali metal element. Its atomic number is 55; its atomic mass is 132.9. Like other alkali metals, cesium emits electrons when exposed to visible light and is used in photoelectric cells and in television cameras. Also spelled caesium.

ce·si·um

(Cs) (sē'zē-ŭm)
A metallic element, atomic no. 55, atomic wt. 132.90543; a member of the alkali metal group. 137Cs (half-life equal to 30.1 years) is used in treatment of certain malignancies.
Synonym(s): caesium.
[L. caesius, bluish gray]

ce·si·um

(Cs) (sē'zē-ŭm)
A metallic element used in treatment of some malignancies.
Synonym(s): caesium.
[L. caesius, bluish gray]

cesium (sē´zēəm),

n an alkali metal element used in photoelectric cells and television cameras.

cesium

a chemical element, atomic number 55, atomic weight 132.905, symbol Cs. See Table 6.

cesium-137
a product of atomic fission by explosion or breakdown of a reactor. It is feared as a pollutant because of its very long half-life.
References in periodicals archive ?
As noted, the amount of radioactive cesium observed doesn't pose a public health risk, but this latest study indicates that radioactive material can be transported far from accident sites.
After several years of rhetoric on the subject of using a rubidium oscillator disciplined by GPS as a replacement for the high cost cesium standard, and after several attempts in industry to produce such an instrument, a truly competitive instrument is now available.
The main pollucite zone at the Tanco Mine only contains an approximate 400,000 metric tons of pollucite with an average Cs2O content of 24%, and a secondary zone of approximately 100,000 metric tons of pollucite contains an average of 5% Cs2O (USGS Cesium 2012); we see this as an opportunity.
Fortunately, cesium shows only modest biomagnification in marine food chains--much less than mercury, a toxic metal, or many other harmful organic compounds such the insecticide DDT and polychlorinated biphenyls (PCBs), Fisher said.
Studies of cesium in fish are not enough, Buesseler argues 6 to make truly informed decisions about potential contamination of seafood, we need to better understand the dynamics of how radioactive bits of material accumulate in the environment.
However, a redefinition of the second, now based on a specific property of cesium, may be decades away, says Zondy.
Abukuma river runs through both Fukushima and Miyagi prefectures, and the research team believes radioactive cesium was carried by the river to the hot spots in the sea.
At that level, Buesseler stressed, the cesium in Japanese coastal waters is safe for marine life and for human exposure.
The Japanese government recently lowered its maximum safety limit for radioactive cesium isotopes to 100 bq per kilogram in wet weight -- equivalent to about 400 bq per kilogram of dried meat, the authors say.
That particular isotope of cesium, which has a half-life of about 30 years, is generated when atoms of uranium-235 and plutonium-239 undergo fission within bombs or nuclear reactors.
In this collaborative program, involving NIST, JPL, the University of Colorado, and the Harvard-Smithsonian Center for Astrophysics, a laser-cooled cesium clock will be put aboard the International Space Station in 2005 to perform certain tests on gravitational theory and to improve upon the realization of the second.
A small group of Bikinians sent back to Bikini in the early 1970s had to be evacuated in 1978 because their diet of coconuts resulted in an alarming buildup of cesium in their bodies.