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 survey conducted in June and July also found 4,400 becquerels of radioactive cesium in a smallmouth bass and 3,000 becquerels in a catfish in Mano Dam in Iitate village, another municipality heavily affected by the crisis at the Fukushima Daiichi nuclear power plant run by Tokyo Electric Power Co.
35 billion becquerels of cesium and 750 million becquerels of other, unnamed radioactive substances, including strontium, that emit beta rays, the Japan Times reports.
The government introduced new ceilings of radioactive food contamination in April, setting a limit of 100 becquerels per kilogram of cesium for regular food items such as meat, vegetables and fish, 50 becquerels for milk and infant food, and 10 becquerels for drinking water.
The water collected on Monday also contained 890,000 becquerels of substances that include strontium, which emits beta radiation, compared with 900,000 becquerels found in groundwater sampled from the well on Friday, the report added.
While the cesium concentration on the surface roughly came down to the pre-disaster level in June, a high concentration of about 9 becquerels per ton of seawater was confirmed at a depth of 300-400 meters in an area about 2,000 km east of the prefecture.
In July last year, beef from Fukushima and several other prefectures was found to be tainted with radioactive cesium exceeding a provisionally set regulatory limit of 500 becquerels per kilogram.
18 ( ANI ): A mountain trout caught in the Niida River in Fukushima Prefecture contained 11,400 becquerels of radioactive cesium per kilogram, more than 110 times above the government limit for food products, a survey by the Environment Ministry showed.
The municipal government will incinerate 80 tons of debris with radioactive cesium levels less than 100 becquerels per kilogram and brought from the coastal city of Ishinomaki, Miyagi, mainly by truck.
After being fed angleworms containing about 3,000 becquerels of radiation per kilogram and aquatic insects with 1,550 becquerels for one month last August, an average of 139 becquerels of cesium was detected in two seemas, against the government's limit of 100 becquerels for food.
TEPCO said on Monday that the amount of radioactive material released this month has already reached around 70 million becquerels per hour as compared with 60 million becquerels in December.
If more than 100,000 becquerels of radioactive cesium are found per kilogram of debris, the debris will be transferred to a medium-term storage facility to be built by the state.
According to the Japan Times, a combined 3,400 kg of unmilled rice harvested by two farms in the Oguni district and by one farm in the Tsukidate district contained between 580 and 1,050 becquerels per kilogram of radioactive cesium.