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 ?
Iodine-131 has been monitored by the Japanese authorities in 2 of 10 samples taken in the Fukushima prefecture with values of 60 and 90 becquerel per litre.
The level of cesium in the spinach grown in the city was also higher at 1,931 becquerels, compared to the limit of 500 becquerels.
Besides, the level of iodine in the spinach grown in open air in Kitaibaraki city in Ibaraki, around 75 kilometers south of the nuclear plant, was 24,000 becquerels, 12 times more than the limit of 2,000 becquerels.
In the Becquerel crater, the 10-layer pattern is repeated at least 10 times.
Location of works, place of delivery supplies or performance: 28 Millennium Park Club - 1025 Rue Henri Becquerel 34067 Montpellier cedex 2
Address : 28 Parc Club du Millenaire - 1025 Rue Henri Becquerel 34067 Montpellier cedex 2
Contractor address : 765 rue Henri Becquerel CS 29045
Address : 28 parc Club du Millenaire 1025 rue Henri Becquerel
According to the Tokyo metropolitan government, the level of radioactive iodine-131 at a water purification plant in downtown Tokyo dropped to 79 becquerels per liter on Thursday, below the government legal limit of 100 becquerels for infants under one year old.
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.
According to the metropolitan government, 210 becquerels of radioactive iodine were detected per 1 kilogram of water against the limit of 100 becquerels in a survey Tuesday at a water purification plant in the Kanamachi district of Katsushika Ward.
The Kyodo news agency quoted the metropolitan government as saying that 210 becquerels of radioactive iodine were detected in per kilogram of water against the limit of 100 becquerels at the plant.