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Topic: Antoine Becquerel

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	Henri Becquerel - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-16)
		Becquerel was born in Paris into a scientific family which, including him and his son, produced four generations of scientists.
		The SI unit for radioactivity, the becquerel (Bq) is named after him, and also there are Becquerel craters on the Moon and Mars.
		Becquerel short biography (http://www1.bipm.org/en/si/history-si/radioactivity/becquerel.html) and the use of his name as an unit of measure in the SI
	www.lexington-fayette.us /project/wikipedia/index.php/Henri_Becquerel (353 words)

	Henri Becquerel (Site not responding. Last check: 2007-10-16)
		Antoine Henri Becquerel (December 15, 1852 – August 25, 1908) was a French physicist, Nobel laureate, and one of the discoverers of radioactivity.
		In 1896, Becquerel accidentally discovered radioactivity while investigating phosphorescence in uranium salts.
		The SI unit for radioactivity, the becquerel (Bq) is named after him.
	www.1-free-software.com /en/wikipedia/h/he/henri_becquerel.html (184 words)

	Antoine-Henri Becquerel (1852 - 1908)
		Becquerel learned that the X rays issued from the area of a glass vacuum tube made fluorescent when struck by a beam of cathode rays.
		Becquerel reported this discovery to the Academie des Sciences at its session on February 24, 1896, noting that certain salts of uranium were particularly active.
		This was an index of both his and the scientific world's interest in the subject, for the period saw studies of numerous radiations (e.g., cathode rays, X rays, Becquerel rays, "discharge rays," canal rays, radio waves, the visible spectrum, rays from glowworms, fireflies, and other luminescent materials), and Becquerel rays seemed not especially significant.
	www.rtstudents.com /radiology/antoine-henri-becquerel.htm (1018 words)

	BECQUEREL - LoveToKnow Article on BECQUEREL (Site not responding. Last check: 2007-10-16)
		ANTOINE CfiSAR BECQUEREL (1788-1878), was born at Chtillon sur Loing on the 8th of March 1788.
		Edmond Becquerel was associated with his father in much of his work, but he himself paid special attention to the study of light, investigating the photochemical effects and spectroscopic characters of solar radiation and the electric light, and the phenomena of phosphorescence, particularly as displayed by the sulphides and by compounds of uranium.
		It was in connection with these latter inquiries that he devised his phosphoroscope, an apparatus which enabled the interval between exposure to the source of light and observation of the resulting effects to be varied at will and accurately measured.
	www.1911encyclopedia.org /B/BE/BECQUEREL.htm (481 words)

	Adventures in CyberSound: Becquerel, Antoine César, Alexandre Edmond and Antoine Henri (Site not responding. Last check: 2007-10-16)
		Becquerel concluded "that the phosphorescent substance in question emits radiation which penetrates paper opaque to light." Initially he believed that the sun's energy was being absorbed by the uranium which then emitted X rays.
		Antoine Henri Becquerel was in fact triple-professor in Paris, since he also became professor at the École Polytechnique and the Conservatoire National des Arts et Métiers.
		Becquerel was awarded the third Nobel Prize in Physis 1903 for "the discovery of spontaneous radioactivity", together with Marie and Pierre Curie for "work on the radiation phenomena discovered by Becquerel".
	www.acmi.net.au /AIC/BECQUEREL_BIO.html (1635 words)

	becquerel
		Becquerel not only inherited their interest in science, he also inherited the minerals and compounds studied by his father.And so, upon learning how Wilhelm Roentgen discovered X rays from the fluorescence they produced, Becquerel had a ready source of fluorescent materials with which to pursue his own investigations of these mysterious rays.
		Becquerel's father, Edmond, had shown that some uranium compounds were phosporesecent, for example, the uranic series, whereas the uranous series was not.
		Becquerel produced more papers on uranium's penetrating rays, but there was really nothing much else that happened until Marie Curie decided to pursue Becquerel's rays as a thesis topic.
	www.calstatela.edu /faculty/kaniol/f2000_lect_nuclphys/lect1/becquerel.htm (1496 words)

	Becquerel (Site not responding. Last check: 2007-10-16)
		Antoine César Becquerel (1788-1878) may literally be called a “grandfather” of electrochemistry, as he was the first of four generations of French scientists who each made significant contributions spanning two centuries.
		The four Becquerels succeeded one another as Professor of Physics at the Museum of Natural History (Paris) and often worked as father-son teams, advancing the knowledge in electrochemistry, physics, biology, electricity, and agriculture.
		Antoine Becquerel's first electrochemical research described his observation of unexpected current when two pieces of platinum were dipped, in succession, into an acid.
	www.bioanalytical.com /info/calendar/97/becq.htm (237 words)

	Henri Becquerel - Biography
		His father, Alexander Edmond Becquerel, was a Professor of Applied Physics and had done research on solar radiation and on phosphorescence, while his grandfather, Antoine César, had been a Fellow of the Royal Society and the inventor of an electrolytic method for extracting metals from their ores.
		Later, Becquerel showed that the rays emitted by uranium, which for a long time were named after their discoverer, caused gases to ionize and that they differed from X-rays in that they could be deflected by electric or magnetic fields.
		For his discovery of spontaneous radioactivity Becquerel was awarded half of the Nobel Prize for Physics in 1903, the other half being given to Pierre and Marie Curie for their study of the Becquerel radiation.
	nobelprize.org /physics/laureates/1903/becquerel-bio.html (566 words)

	AllRefer.com - Becquerel (Physics, Biography) - Encyclopedia
		Antoine CEsar Becquerel, 1788–1878, was a pioneer in electrochemical science.
		Becquerel made a special study of the voltaic cell, telegraphy, and magnetism and wrote several books on these subjects.
		His son, Antoine Henri Becquerel, 1852–1908, was professor at the Ecole polytechnique, Paris, from 1895.
	reference.allrefer.com /encyclopedia/B/Becquere.html (238 words)

	Discovery of Radioactivity (Site not responding. Last check: 2007-10-16)
		Henri's father, Alexandre-Edmond Becquerel, and his grandfather, Antoine Csar becquerel, were renowned physicists, both members of the Academy of Sciences and each in his turn professor of Physics at the Muserum of Natural History.
		Becquerel succeeded to the post of his father at the Museum, and from then on, his professional life was shared among the Museum, the Polytechnique, and the Ponts et Chaussees.
		Becquerel's example is comforting to us: His genius emerged because he mistakenly believed in a connection between the penetrating rays and phosphorescence, and because he felt compelled to speak at the academy's meeting.
	www.vigyanprasar.com /dream/apr2001/RADIOACTIVITY.htm (8332 words)

	Becquerel, (Antoine-)Henri
		He was a member of a scientific family extending through several generations, the most notable being his grandfather Antoine-César Becquerel (1788-1878), his father, Alexandre-Edmond Becquerel (1820-91), and his son Jean Becquerel (1878-1953).
		Becquerel reported this discovery to the Académie des Sciences at its session on February 24, 1896, noting that certain salts of uranium were particularly active.
		It required the extension in 1898 of radioactivity to another known element, thorium (by Gerhard Carl Schmidt and independently by Marie Curie), and the discovery of new radioactive materials, polonium and radium (by Pierre and Marie Curie and their colleague, Gustave Bémont), to awaken the world and Becquerel to the significance of his discovery.
	www.britannica.com /nobel/micro/59_13.html (1013 words)

	The Discovery Of Radioactivity: The Dawn of the Nuclear Age
		Becquerel, a French physicist, was the son and grandson of physicists.
		Becquerel was familiar with the work of Wilhelm Conrad Roentgen on December 22 1895, "photographed" his wife's hand, revealing the unmistakable image of her skeleton, complete with wedding ring.
		Becquerel found that, while the phenomena of fluorescence and phosphorescence had many similarities to each other and to X-rays, they also had important differences.
	www.accessexcellence.org /AE/AEC/CC/radioactivity.html (1373 words)

	Becquerel on Encyclopedia.com (Site not responding. Last check: 2007-10-16)
		Antoine César Becquerel, 1788-1878, was a pioneer in electrochemical science.
		His son, Antoine Henri Becquerel, 1852-1908, was professor at the École polytechnique, Paris, from 1895.
		Raoul Becquerel reconnaît avoir violé après sa libération par erreur
	www.encyclopedia.com /html/B/Becquere.asp (567 words)

	Collaboratory (Site not responding. Last check: 2007-10-16)
		Antoine Henri Becquerel was born in Paris on December 15, 1852, a member of a distinguished family of scholars and scientists.
		Alexander Edmond Becquerel, his father, was a Professor of Applied Physics and had done research on solar radiation and on phosphorescence.
		Antoine César, his grandfather, had been a Fellow of the Royal Society and the inventor of an electrolytic method for extracting metals from their ores.
	mr-rogers2.it.northwestern.edu /cgi-bin/WebObjects/Portal.woa/wa/CYDirectAction/viewCybrary?libID=1416 (204 words)

	The ORCBS - Radiation Safety - Resources & Links - Historical Figures
		Henri Becquerel was born into a family of scientists.
		Later, Becquerel demonstrated that the radiation emitted by uranium shared certain characteristics with X rays but, unlike X rays, could be deflected by a magnetic field and therefore must consist of charged particles.
		For his discovery of radioactivity, Becquerel was awarded the1903 Nobel Prize for physics.
	www.orcbs.msu.edu /radiation/resources_links/historical_figures/becquerel.htm (358 words)

	Discovery of Radioactivity: Becquerel (Site not responding. Last check: 2007-10-16)
		Antoine Henri Becquerel (1852-1908; view photo at Musée Curie) was the third of four Becquerels to hold a chair of physics at the Paris Museum of Natural History and to belong to the Academy of Sciences, following his grandfather Antoine César, his father Alexandre Edmond, and preceding his son Jean.
		Becquerel found something unusual within the past week, and he reports preliminary results at the next weekly meeting of the French Academy of Sciences.
		The hypothesis was a reasonable one for a scientist with Becquerel's expertise, for he would have known that some crystals have long-lasting visible phosphorescence; that is, some crystals phosphoresce for minutes after the light which stimulates the phosphorescence is removed.
	web.lemoyne.edu /~giunta/ea/BECQUERELann.HTML (2590 words)

	Becquerel (Site not responding. Last check: 2007-10-16)
		He was born in Paris, and became professor of physics at the Museum of Natural History in 1892 and at Polytechnical School in 1895.
		In 1896, Becquerel accidentally discovered the phenomenon of radioactivity in the course of his research on fluorescence.
		In 1903 Becquerel shared the Nobel Prize in physics with the French physicists Pierre and Marie Curie for their work on radioactivity.
	www.newlisbon.k12.wi.us /physicists/becquerel.html (127 words)

	The Discovery of Radioactivity
		Antoine Henri Becquerel, a French scientist, was conducting an experiment which started with the exposure of a uranium-bearing crystal to sunlight.
		Becquerel theorized that the absorbed energy of the sun was being released by the uranium in the form of x-rays.
		What Becquerel had discovered was that a piece of mineral which contained uranium could produce it's image on a photographic plate in the absence of light.
	www.chem.duke.edu /~jds/cruise_chem/nuclear/discovery.html (679 words)

	Henri Becquerel (Site not responding. Last check: 2007-10-16)
		Henri Antoine Becquerel did one such act at the end of last century by forgetting some photographic plates in his drawer for a few days.
		Yet, it is this climate that turned out to be a blessing in diguise for Becquerel, who was born on 15 December 1852 in Croisic and was well known in his town Grande Brière.
		Based on the work done by Becquerel and the Curies, "the best sprinters" in this race, as also that of Joseph Thomson and Ernest Rutherford, it was proved that these compounds emitted more or less penetrating radiations (alpha and beta) which resulted from the spontaneous transmutation of a chemical element into another.
	ambafrance-ca.org /HYPERLAB/PEOPLE/_becquer.html (817 words)

	Becquerel. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Antoine César Becquerel, 1788–1878, was a pioneer in electrochemical science.
		His second son, Alexandre Edmond Becquerel, 1820–91, succeeded his father, in 1878, as professor at the Muséum d’Histoire naturelle.
		His son, Antoine Henri Becquerel, 1852–1908, was professor at the École polytechnique, Paris, from 1895.
	www.bartleby.com /65/be/Becquere.html (199 words)

	Expt. VI-1 Reversibility
		Becquerel noted that the exposure could not be attributed to the luminous radiation emitted by the very brief phosphorescence.
		Becquerel was cautious to avoid claiming that this radiation was actually X-rays.
		If you don't have the needed materials the experiment has been repeated many times by the author and his students so that a couple of their photographs can be shared with you.
	homepage.mac.com /dtrapp/ePhysics.f/labVI_1.html (1032 words)

	New Catholic Dictionary: Becquerel, Antoine Henri (Site not responding. Last check: 2007-10-16)
		(1852-1908) Physicist, son of Antoine César Becquerel, born Paris.
		He discovered Becquerel's Rays, i.e., the invisible radiations from uranium, and made important researches concerning optics.
		He is the founder of radio-activity, and in 1903 shared the Nobel prize for physics for his valuable work on that subject.
	www.catholic-forum.com /saints/ncd01094.htm (47 words)

	Becquerel, Henri -- Encyclopædia Britannica
		In addition to his teaching and research posts, Becquerel was for many years an engineer in the Department of Bridges and Highways,...
		Even before Rutherford's experiment, the German physicist Wilhelm Conrad Roentgen in 1895 and the French physicist Henri Becquerel in 1896 had observed the mysterious “X rays,” which gave the first strong hint of the existence of nuclei.
		Biographical sketches of Antoine Henri Becquerel, Pierre Curie, and Marie Curie of France.
	www.britannica.com /eb/article?tocId=9014051 (767 words)

	becquerel - a Whatis.com definition (Site not responding. Last check: 2007-10-16)
		The becquerel is the derived unit of radioactivity in the International System of Units (SI), symbolized Bq and equal to one disintegration or nuclear transformation per second.
		The becquerel is named after Antoine Henri Becquerel, the French physicist credited with the discovery of radioactivity.
		In the 1970s, the becquerel replaced the curie as the standard unit of radioactivity.
	whatis.techtarget.com /definition/0,,sid9_gci546275,00.html (170 words)

	Radioactivity: Historical Figures
		This article will focus on the efforts of four scientists: Wilhelm Conrad Roentgen, Antoine Henri Becquerel, Marie Sklodowska Curie, and Ernest Rutherford.
		Further investigation, on the 26th and 27th of February, was delayed because the skies over Paris were overcast and the uranium-covered plates Becquerel intended to expose to the sun were returned to a drawer.
		Together, they began investigating the phenomenon of radioactivity recently discovered in uranium ore. Although the phenomenon was discovered by Henri Becquerel, the term radioactivity was coined by Marie.
	www.accessexcellence.org /AE/AEC/CC/historical_background.html (1433 words)

	Low Dose Radiation Research Program
		Antoine-Henri Becquerel discovers rays produced by uranium, the first observation of natural radioactivity.
		Antoine-Henri Becquerel, Pierre and Marie Curie share the Nobel Prize for physics.
		Becquerel for his discovery of natural radioactivity and the Curies for their study of radioactivity.
	lowdose.tricity.wsu.edu /timeline.htm (4625 words)

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