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 ?
The EU limit is 600 becquerels, however, Norway allowed 6,000 becquerels after the explosion, which it reduced to 3,000 in 1994.
The legal limit for the release of strontium-90 into the sea outside the plant, meanwhile, is set at 30 becquerels per liter.
The Yamagata prefectural government, meanwhile, said it detected 694 becquerels per kg in meat of cattle from the farm.
The property is just minutes from the house where the highest ever level was detected in 2003 - it had a reading of 49,000 becquerels.
Hitachi City in Ibaraki Prefecture (130 km northeast of Tokyo) detected 298 becquerels of iodine-131 in water at a purification plant, while Matsudo City of Chiba Prefecture (25 km east of Tokyo) found 220 becquerels of iodine-131 at its two filtration plants.
In July 2011, meat from 11 cows shipped to Tokyo from the Fukushima Prefecture was found to have 1,530 to 3,200 becquerels per kilogram of Cs-137, exceeding the Japanese legal limit of 500 becquerels per kilogram at that time.
1 nuclear plant well to 5 million becquerels of strontium per liter, both a record, and nearly five times higher than the original reading of 900,000 becquerels per liter.
Tepco detected 140,000 becquerels per liter of beta ray-emitting substances, including strontium, from a water sample collected on Wednesday from the ditch, which extends to the sea beyond the plant's port, the Japan Times reports.
About 10 tons of water may have leaked, the utility said, noting the pipe contained some 37 million becquerels per liter of radioactive substances that emit beta rays such as strontium-90 in a reading in August, against the legal limit of 30 becquerels for strontium-90.
In a release, Tokyo Electric Power (TEPCO) said groundwater showed radiation readings of 3,200 becquerels per litre.
On Wednesday, the prefectural tests detected 630 becquerels per kilogram of
Japan's biggest utility estimated around 4,720 trillion becquerels of cesium-137 and iodine-131 was released into the Pacific Ocean between March 21 and April 30, but researchers at the Japan Atomic Energy Agency (JAEA) put the amount 15,000 trillion becquerels, or terabecquerels.