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- Marie Curie (5862 bytes)
5: ...ng even food and sleep to study. After graduating from high school, she suffered a [[nervous breakdown...
7: ...g more [[radioactive]] than the uranium extracted from it. By [[1898]] they deduced a logical explanat...
9: ...ative country, and the other was named [[radium]] from its intense radioactivity.
11: ...diation phenomena discovered by Professor [[Henri Becquerel]]". She was the first woman to be awarded a Nobe...
17: ... to matter). France at the time was still reeling from the effects of the [[Dreyfus affair]], so the s... - Age of the Earth (20052 bytes)
1: ...arth is not exactly known yet and the predictions from different accretion models vary between several...
4: ...s Ussher]] of [[Armagh]], [[Ireland]], calculated from the Bible (augmented by some [[astronomy]] and ...
6: ...ho thought the Earth and [[universe]] had existed from eternity.
9: ...tury]] that the Earth had been created separately from the rest of the universe, several hundred thous...
11: ... mostly speculative, but in [[1779]] the [[France|French]] naturalist the [[Georges-Louis Leclerc, Com... - Polonium (10219 bytes)
100: ...m is used on brushes that remove accumulated dust from [[photographic film]]s. The polonium in these b...
104: ...re above 750 K. A few [[curie]]s ([[Becquerel|gigabecquerels]])of polonium-210 emit a blue glow which is caus...
109: ...he element. The electroscope showed it separating from bismuth.
117: ...pes of polonium with [[atomic mass]]es that range from 194 u to 218 u. Polonium-210 is the most widely...
121: ...damage occurs from energy absorption into tissues from alpha particles. - Radon (12616 bytes)
127: ...a colorless gas but when it is cooled below its [[freezing point]] it has a brilliant phosphorescence ...
129: ...e water]]. Likewise, the saturated zone of a soil frequently has a higher radon content than the unsat...
132: ...actice is being phased-out as hospitals get seeds from suppliers who make them with the desired activi...
137: ...d for [[radium]]) was discovered in [[1900]] by [[Friedrich Ernst Dorn]], who called it radium emanati...
142: ... taken starting from concentrations of 400 [[Becquerel|Bq]]/m<sup>3</sup> for old houses, and 200 B... - Radium (13138 bytes)
4: <tr><td colspan="2" align="center">[[Francium]] - '''Radium''' - [[Actinium]]</td>
100: When freshly prepared, pure radium metal is brilliant whi...
103: Some of the practical uses of radium are derived from its radiative properties. More recently discove...
104: ... who used their lips to shape the paintbrush died from the radiation. Soon afterward, the adverse effe...
110: ...udying pitchblende the Curies removed [[uranium]] from it and found that the remaining material was st... - Technetium (32113 bytes)
182: ...iagnostic tests. Tc-99 is used as a [[gamma ray]]-free source of [[Beta particle|beta ray]]s, and its ...
184: ...um-235]] in [[nuclear reactor]]s and is extracted from [[nuclear fuel rod]]s. No isotope of technetium...
191: ...ion depth]], the largest among the elements apart from [[niobium]].{{inote|''Technetium as a Material ...
201: ...rtechnetate) both isotopes are quickly eliminated from the body (generally within a few days {{inote|T...
205: ... extracted to a high chemical and isotopic purity from radioactive waste. For these reasons, it is a ... - Uranium (27752 bytes)
165: *beta (tetragonal) stable from 667.7 °C to 774.8 °C
166: *gamma (body-centered cubic) from 774.8 °C to melting point - this is the mos...
170: ...up>233</sup>U isotope is also fissile and is made from <sup>232</sup>[[thorium]] by [[neutron]] bombar...
184: ...natural uranium, because the [[mineral]] material from which they are made is typically high in uraniu...
191: ...ctivity|radioactive]] by French physicist [[Henri Becquerel]] in [[1896]], who first discovered the process o... - Physics (25628 bytes)
2: ... contexts, ranging from the sub-nuclear particles from which all ordinary matter is made ([[particle p...
12: The culture of physics research differs from the other sciences in the separation of [[theor...
15: ...mulation of new theories. Likewise, ideas arising from theory often inspire new experiments. In the ab...
34: | [[Boltzmann's constant]], [[Entropy]], [[Free energy]], [[Heat]], [[Partition function (stati...
42: ...lence principle]], [[Four-momentum]], [[Reference frame]], [[Spacetime]], [[Speed of light]]
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