Becquerel


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Becquerel

(bĕkərĕl`), family of French physicists. Antoine César Becquerel, 1788–1878, was a pioneer in electrochemical science. He was professor of physics at the Muséum d'Histoire naturelle from 1838 until his death. Becquerel made a special study of the voltaic cell, telegraphy, and magnetism and wrote several books on these subjects. His second son, Alexandre Edmond Becquerel, 1820–91, succeeded his father, in 1878, as professor at the Muséum d'Histoire naturelle. Known for his studies in light, photochemistry, and phosphorescence (for which he invented the phosphoroscope), Alexandre wrote La Lumière, ses causes et ses effets (1867–68). His son, Antoine Henri Becquerel, 1852–1908, was professor at the École polytechnique, Paris, from 1895. He studied atmospheric polarization and the influence of the earth's magnetism on the atmosphere. In 1896 he discovered radioactivityradioactivity,
spontaneous disintegration or decay of the nucleus of an atom by emission of particles, usually accompanied by electromagnetic radiation. The energy produced by radioactivity has important military and industrial applications.
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 in uraniumuranium
, radioactive metallic chemical element; symbol U; at. no. 92; mass number of most stable isotope 238; m.p. 1,132°C;; b.p. 3,818°C;; sp. gr. 19.1 at 25°C;; valence +3, +4, +5, or +6.
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; the Curies made further investigations of the phenomenon and shared with Becquerel the 1903 Nobel Prize in Physics (see CurieCurie
, family of French scientists. Pierre Curie, 1859–1906, scientist, and his wife, Marie Sklodowska Curie, 1867–1934, chemist and physicist, b. Warsaw, are known for their work on radioactivity and on radium.
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, family).

becquerel

[¦bek·ə¦rel or be′krel]
(nucleonics)
The International System unit of activity of a radionuclide, equal to the activity of a quantity of a radionuclide having one spontaneous nuclear transition per second. Symbolized Bq.

becquerel

the derived SI unit of radioactivity equal to one disintegration per second.

Becquerel

Antoine Henri . 1852--1908, French physicist, who discovered the photographic action of the rays emitted by uranium salts and so instigated the study of radioactivity: Nobel prize for physics 1903
References in periodicals archive ?
Por su parte, el britanico Ernest Rutherford, tras el descubrimiento de Becquerel, comprobo que las radiaciones de uranio se dividen en tres: un chorro de particulas positivas de gran masa (rayos alfa), otro de particulas negativas de masa pequena (rayos beta) y particulas que no se desvian, de ondas electromagneticas de alta frecuencia (rayos gamma).
For this discovery, Becquerel received a share of the Nobel Prize in physics in 1903 and rightly so, for it had enormous consequences.
These concentrations show a significant decrease from 74 000 Becquerel per litre of iodine-131, 12 000 Becquerel per litre of cesium-137, and 12 000 Becquerel per litre of cesium-134 on 26 March to 11 000 Becquerel per litre of iodine-131 and 1 900 Becquerel per litre of cesium-137 on 27 March.
For iodine-131 the concentration results for four monitoring stations are between 6 to 18 becquerel per litre, and for caesium-137 between i 1/2below limit of detectioni 1/2 and 16 becquerel per litre.
However, as Becquerel speedily pointed out, the purified uranium compound, which was only slightly radioactive if at all steadily gained in radioactive intensity if allowed to remain standing.
The Ministry of Health, Labor and Welfare said 510 becquerels of radioactive cesium was detected in beef from Tenei, Fukushima Prefecture, above the 500-becquerel legal limit set under the food sanitation law.
Based on a pattern of layers within layers measured at one location, known as Becquerel crater, the scientists propose that each layer was formed over a period of about 100,000 years and that these layers were produced by the same cyclical climate changes.
The standard sets a limit of 200 becquerel cesium per 1 kilogram of milk and dairy products, 500 becquerel per 1 kg of vegetables, grains, meat and eggs, while for levels of radioactive iodine, the standard allows 300 becquerel for 1 kilogram of drinking water and 2,000 becquerel for a kilogram of vegetables.
Contract notice: Babysitting And Reception Services At The Jules Horowitz Campus Boulevard Henri Becquerel In Caen (14).
According to the Tsuruga city government, the water contained 170,000 becquerel of radiation, about one-20th the amount a nuclear power plant operator is required to inform the government about.