Topic: nuclear power - on March 15, 2011 at 5:52:00 PM CET
Strahlenbelastung
Als Strahlenbelastung oder auch Strahlenexposition bezeichnet man die Einwirkung von ionisierender Strahlung auf Lebewesen oder auf Materie. Im Gegensatz zum Begriff Strahlenexposition setzt Strahlenbelastung im Sprachgebrauch des Strahlenschutzes eine schädigende Wirkung voraus.
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Topic: nuclear power - on March 15, 2011 at 5:47:00 PM CET
Caesium
Caesium (nach IUPAC), standardsprachlich Cäsium oder Zäsium (im amerikanischen Englisch Cesium), ist ein chemisches Element mit dem Elementsymbol Cs und der Ordnungszahl 55. Im Periodensystem steht es in der 1. Hauptgruppe und gehört zu den Alkalimetallen. Caesium ist das schwerste stabile Alkalimetall.
Caesium wurde 1861 von Robert Wilhelm Bunsen und Gustav Robert Kirchhoff in Dürkheimer Mineralwasser entdeckt. Aufgrund der zwei blauen Spektrallinien, mit denen das Element nachgewiesen wurde, nannten sie es nach dem lateinischen caesius für himmelblau. Das Reinelement konnte erstmals 1881 von Carl Setterberg dargestellt werden.
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Topic: nuclear power - on March 15, 2011 at 5:46:00 PM CET
Caesium
Caesium or cesium[note 1] (play /ˈsiːziəm/ SEE-zee-əm) is the chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-gold alkali metal with a melting point of 28 °C (82 °F), which makes it one of only five elemental metals that are liquid at (or near) room temperature.[note 2] Caesium is an alkali metal and has physical and chemical properties similar to those of rubidium and potassium. The metal is extremely reactive and pyrophoric, reacting with water even at −116 °C (−177 °F). It is the least electronegative element that has stable isotopes, of which it has only one, caesium-133. Caesium is mined mostly from pollucite, while the radioisotopes, especially caesium-137, are extracted from waste produced by nuclear reactors.
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Topic: nuclear power - on March 15, 2011 at 5:42:00 PM CET
Doomsday Scenario at Fukushima
The slow motion events occurring at Japan's (or GE's) Fukushima reactor cannot be sugar-coated. It is a doomsday scenario unfolding.
Nuclear reactors are not the same as coal/oil/gas electricity plants. Unlike conventional plants, they cannot be turned off. So while brave workers were tending to Units 1, 2 and 3 reactors, attempting against all odds to keep the reactor from overheating, the fuel pool at Unit 4 was left untended; without makeup water to cool them, the fuel rods overheated. Above 1800 oF, an exothermic reaction, a fire, took place with the zirconium cladding around the uranium pellets. Zirconium burned, forming zirconium oxide and hydrogen gas, which then exploded and released radioactive cesium, a semi-volatile metal, to the atmosphere.
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Topic: War and Peace News - on March 15, 2011 at 4:28:00 PM CET
Revolutionary fighter jets destroy 2 Gaddafi warships off the coast of Ajdabiya
Anti-government activists said that rebels commanding fighter jets have destroyed two of Gaddafi's warships off the northeast coast of Ajdabiya.
The opposition also claimed to have hit a third naval ship in the air attack, according to opposition website Libya al-Youm.
A number of army generals and soldiers, particularly in the Libyan Air Force, have defected to join the rebels and have an arsenal of weapons and fighter jets at their disposal.
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Topic: nuclear power - on March 15, 2011 at 4:11:00 PM CET
Japanese nuclear plant hit by fire and third explosion
Amid growing fears that the situation is heading for catastrophe, 70 technicians are still battling to cool reactors at the Fukushima Daiichi facility but non-essential personnel have been ordered to leave and the Kyodo news agency reported that radiation levels have become too high for staff to remain in control rooms. The government has already called in international help in tackling the spiralling crisis.
Early on Tuesday, the power plant in the country's stricken north-east was rocked by an explosion at the No 2 reactor, the third blast at the site in four days. That was followed by a fire that broke out at the No 4 reactor unit, which appeared to be the cause of today's radiation leaks. That reactor was shut down for maintenance before the earthquake, but its spent fuel rods are stored in a pool at the site. The fire was later extinguished but Kyodo reported that the pool was subsequently boiling, with the water level falling. If the water boils off there is a risk that the fuel could catch fire, sending a plume of radiation directly into the atmosphere.
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Topic: nuclear power - on March 15, 2011 at 3:21:00 PM CET
Live: Super-GAU in Japan? NHK World Deutsch
TW1 überträgt das Programm des japanischen Senders NHK und berichtet live von den Ereignissen in Japan - Livestream in
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Topic: NATURE - on March 15, 2011 at 3:14:00 PM CET
Magnitude 6.2 in Shizuoka - Hamaoka Nuclear Power Station
The focus of the quake is in the eastern part of Shizuoka Prefecture and is estimated to be at a depth of 10 kilometers.
Tuesday, March 15, 2011 23:05 +0900 (JST)
nhk.or.jp jnes.go.jp/atom-db/en/general/ Hamaoka_Nuclear_Power_Plant
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Topic: nuclear power - on March 15, 2011 at 3:12:00 PM CET
Das habe die Betreiberfirmer TEPCO mitgeteilt, meldete die Nachrichtenagentur Kyodo heute. Eine weitere Eskalation der Situation drohe.
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Topic: nuclear power - on March 15, 2011 at 12:05:00 PM CET
Germany shuts down seven nuclear reactors
"We are launching a safety review of all nuclear reactors ... with all reactors in operation since the end of 1980 set to be idled for the period of the (three-month) moratorium," Merkel said.
Germany's 17 nuclear power stations are operated by E.ON, RWE, EnBW and Swedish Vattenfall.
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Topic: not on frontpage - on March 15, 2011 at 11:53:00 AM CET
Merkel: Sieben deutsche AKWs gehen vom Netz
Die Konsequenzen aus der am Montag ausgesetzten Laufzeitverlängerung für Deutschlands älteste AKWs gehen weiter als bisher angenommen. Die deutsche Kanzlerin Merkel (CDU) gab am Dienstag nach einem Krisentreffen bekannt, dass alle bis 1980 in Betrieb genommenen Atomanlagen vom Netz genommen werden. Umweltminister Röttgen (CDU) wollte nicht ausschließen, dass die zunächst vorübergehend abgeschalteten sieben AKWs dauerhaft stillgelegt werden könnten. Von der Maßnahme betroffen ist auch das nahe der österreichischen Grenze gelegene bayrische AKW Isar I.
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Topic: nuclear power - on March 15, 2011 at 10:43:00 AM CET
Radiation level falls in Tokyo: city government - Tokyo a city on edge amid nuclear emergency
The level of radiation in Tokyo fell Tuesday afternoon after rising above normal levels in the morning due to radiation emmitted from a quake-hit nuclear power plant, metropolitan officials said.
Tokyo officials said they detected 0.809 of a micro-sievert between 10:00 am (0100 GMT) and 11:00 am in the capital, some 250 kilometres (155 miles) southwest of the troubled Fukushima plant on the Pacific coast.
mysinchew.com Tokyo a city on edge amid nuclear emergencynews.com.au Geiger counter reading Tokyo
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