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Thorium is a naturally occurring radioactive chemical element with the symbol Th and atomic number 90. It was discovered in 1828 by the Norwegian mineralogist Morten Thrane Esmark and identified by the Swedish chemist Jöns Jakob Berzelius and named after Thor, the Norse god of thunder. Thorium produces a radioactive gas, radon-220, as one of its decay products. Secondary decay products of thorium include radium and actinium. Thorium was once commonly used as the light source in gas mantles and as an alloying material, but these applications have declined due to concerns about its radioactivity. Characteristics[edit] Physical properties[edit] A close view of a thorium crystal Pure thorium is a silvery-white metal that is air-stable and retains its luster for several months. Powdered thorium metal is often pyrophoric and requires careful handling. Chemical properties[edit] Thorium's oxide is ThO2. Compounds[edit] Thorium compounds are stable in the +4 oxidation state.[9] Isotopes[edit] Related:  ThoriumTransport

Energie nucléaire : Nucléaire du futur Le cycle thorium Le thorium (Th 232) est un matériau fertile, abondant dans la nature. Par absorption d’un neutron, puis décroissance radioactive, il produit du Pa 233 puis du U 233, isotope fissile. Ce dernier est lui-même intéressant, car sa fission produit un peu plus de neutrons que celle de U 235 ou de Pu 239 dans un spectre thermique. Ces différentes raisons ont conduit, dans les années cinquante, à s’intéresser de près à la filière U 233- thorium ; des combustibles ont été fabriqués et utilisés dans différents réacteurs, dont le REP expérimental américain de Shippingport (Pennsylvanie), le HTR de Fort St. Vrain (Colorado) et le THTR allemand. Au cours des dernières années, la filière thorium a fait l’objet d’un nouvel examen, à la fois parce que cette filière produit beaucoup moins de transuraniens* et parce que robotique et télémanipulation ont fait des progrès considérables, limitant peut-être les inconvénients liés au rayonnement γ. Le mécanisme de la spallation

China Takes Lead in Race for Clean Nuclear Power | Wired Science China has officially announced it will launch a program to develop a thorium-fueled molten-salt nuclear reactor, taking a crucial step towards shifting to nuclear power as a primary energy source. The project was unveiled at the annual Chinese Academy of Sciences conference in Shanghai last week, and reported in the Wen Hui Bao newspaper (Google English translation here). If the reactor works as planned, China may fulfill a long-delayed dream of clean nuclear energy. The United States could conceivably become dependent on China for next-generation nuclear technology. At the least, the United States could fall dramatically behind in developing green energy. “President Obama talked about a Sputnik-type call to action in his SOTU address,” wrote Charles Hart, a a retired semiconductor researcher and frequent commenter on the Energy From Thorium discussion forum. In addition to their safety, MSRs can consume various nuclear-fuel types, including existing stocks of nuclear waste. See Also:

Re-fuel Every 100 Years With the New Thorium Car By: Amanda Froelich, True Activist. If you haven’t yet been amazed by the hybrid car that runs on air or the water-powered engine, this vehicle is sure to make you think twice about the alternative forms of transportation which will one day rule the road. The new Thorium car, created by a company called Laser Power Systems, is completely emission-free, turbine-free, and is electricity generated. Fueled by nuclear thorium lasers, this engine only needs 8 grams of fuels every 100 years. It seems many countries and military agencies have been experimenting with this type of energy to power vehicles for a number of years. Go Thorium sheds insight to its long-time study: “What China is attempting is to turn the nuclear clock back to the mid-1960s, when Oak Ridge successfully operated a reactor with fuel derived from thorium and cooled with molten salts. It is quite clear that modern day nuclear reactors are no longer needed. Sources: Collective Evolution Thorium Fuel Benefits, IAEA

Thorium : le nucléaire alternatif safe et propre ?? - Actualité - Discussions Le Thorium Qu'est-ce que c'est ? Le thorium est un élément radioactif naturel comme l'uranium. C'est un métal de la famille des actinide, de symbole Th, de numéro atomique 90 et de couleur argenté. Découvert en 1829 par Jöns Jacob Berzelius, il est nommé d'après Thor, dieu scandinave du tonnerre. C'est en 1898 que sa radioactivité est découverte indépendamment par deux chercheurs : la physicienne polonaise naturalisée française Marie Curie et le chimiste allemand Gerhard Carl Schmidt. Détaillons le schéma. La blanket sert aussi de bouclier à la cuve du réacteur contre les dommage dû aux neutrons et aux emission gamma. --------------- Losers IV : le forum des losers/sans-amis/VDM & co :o | N'essayez MÊME PAS le second degrée avec moi.

The Thorium Problem Should be the Thorium Solution | Thought Infection I watched this wonderful talk from Jim Kennedy this week. In the talk, Jim beautifully breaks down the surprising economic connections between the loss of control of the rare-earth mineral market, the decline in the manufacturing dominance of America, and the potential to develop thorium as a nuclear fuel source. Kennedy posits that by controlling the relatively small ($3 billion) market on rare-earth mineral production, China has put a lock on the huge market of value-added goods ($4+ trillion). Basically, by controlling access to the rare-earth minerals which are absolutely essential for the production of electronics, China is putting immense economic pressure on manufacturers to produce their goods in China. Kennedy presents a strong argument, and where it really gets fascinating is the connection of this industry to nuclear regulation. Thorium is a relatively common mineral in the earth’s crust; it is also radioactive. If we want to dream big, we are going to need the power to do it.

The 500,000 + Piece LEGO Car That Runs on Compressed Air Below is a video of a plastic car built almost entirely out of LEGO parts, more than 500,000 to be exact. It only needed tires and a few suspension parts that were not made out of LEGO. It consists of four orbital engines which hold 256 pistons inside. It travels at a speed between 20-30 km/h and runs completely off of compressed air. It was designed and built by 20-year-old Raul Oaida from Romania. This raises the obvious question, if a LEGO car can run on compressed air, can we do so the same with conventional automobiles? Peugeot, for example, an automobile manufacturing company in France plans to start selling the first air powered car as early as 2015. Below is a brief vide released last year by the company. Peugeots model would not be able to travel more than 50 mph, and would be solely for city use. I’m sharing this with you because it’s just another example of how we don’t really need to use gas to generate energy for our automobiles. Sources:

Le thorium, le nucléaire du futur ? Cet élément chimique semble n’avoir que des qualités par rapport à son cousin l’uranium : des réserves pour 10000 ans au moins ; des déchets bien plus simples à gérer ; un risque zéro de fusion du réacteur et donc d’accident majeur ; une capacité à incinérer les déchets de longue durée du nucléaire actuel et du nucléaire militaire. Dans un entretien avec le journal suisse L’illustré, Jean-Christophe de Mestral estime que, vu les avantages potentiels des réacteurs à sels fondus utilisant le thorium, "il n’est pas logique de prendre des décisions sans tenir compte d’une solution industrielle aussi prometteuse." Il se réfère notamment à un article récent paru dans The Telegraph qui affirme que, si Obama lançait le thorium maintenant, les Etats-Unis pourraient se passer du charbon dans vingt ans. "Et je n’ai pas encore rencontré un scientifique disant que cette piste était illusoire. La Chine et l’Inde ont par ailleurs pris la décision de se lancer dans cette filière." Le Thorium en France

Thorium: a safer nuclear power April may have the been the “cruelest month” for T.S. Eliot, but March may hold that claim for the Japanese and American nuclear industries, where two high-profile accidents – Fukushima and Three Mile Island – have etched themselves in collective memory and distrust (read more here and here). Skip to next paragraph Ken Silverstein is an award-winning journalist whose work has been published in more than 100 periodicals and has served as a source for energy stories in The New York Times, Washington Post, USA Today, National Public Radio, and Atlantic Monthly. He can be reached at Recent posts Subscribe Today to the Monitor Click Here for your FREE 30 DAYS ofThe Christian Science MonitorWeekly Digital Edition Such accidents could become a thing of the past if the nuclear industry can wean itself off of uranium and embrace thorium, which is more abundant, less melt-prone, and therefore safer to use. Fourth-generation reactors are just on the drawing boards.