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    • やはり核兵器の製造・維持は高くつく
      米 gao (government accountability office) は nnsa (national nuclear security administration) について、核兵器の製造・維持に必要なトリチウムの確保策を講じるよう求める内容の報告書をまとめた

    • Jens-Anton Poulsson obituary
      Joint leader of the daring wartime raid at TelemarkThe military career of the Norwegian Jens-Anton Poulsson, who has died aged 91, lasted 42 years, but may fairly be said to have peaked near the beginning, when he led the home-based support for the most spectacular sabotage operation of the second world war – the destruction of the heavy-water plant in the Telemark region west of Oslo.Poulsson, born at Tinn in Telemark, had just joined the army at the time and fled to Britain after the debacle that followed the German invasion in 1940. This culminated in a chaotic allied withdrawal and the ensuing Nazi occupation. In the UK, Poulsson joined the first Norwegian Independent Company as a second lieutenant. He was soon recruited by the Special Operations Executive (SOE), created in summer 1940 by Winston Churchill for sabotage operations in occupied territory.The Norwegian resistance reported in autumn 1941 that the hydroelectric power-plant at Vermork had stepped up production of heavy water, raising fears that the Germans were accelerating their efforts to develop an atomic bomb. The fluid is used as a moderator to slow down the chain reaction in unenriched uranium 235. The plant, opened before the war as one of the largest of its kind in the world, had been set up to power a fertiliser factory, for which large quantities of hydrogen were needed. A by-product of hydrogen production was deuterium, the hydrogen isotope found in heavy water, which is produced slowly and expensively by electrolysis.The US and Britain, already committed to a programme to create an atomic bomb, concluded that if the Nazis needed large quantities of heavy water, they had to be working on a bomb, just as the exiled Albert Einstein had twice warned. In fact, Albert Speer, Hitler's armaments suprem ノルウェーのイェンスのTelemarkThe軍事キャリアアントンPoulsson氏は91歳で死去したの大胆な戦時中の空襲の共同代表、42年も続いた、かなりされるの先頭付近のとき、彼のサポートのためのホームベースの主導のピークがあると可能性があります第二次世界戦争の中で最も壮大なサボタージュ操作 - Oslo.Poulssonのテレマーク地域の西には、重水プラント、Tinnでテレマーク生まれの破壊は、単に時に、軍に入隊していたし、英国への大敗後、逃走は、1940年にドイツの侵略に続く

    • Iran claims to have built fusion reactor
      Tehran claims yet another nuclear breakthrough but is there anything to it?While the world was watching Egypt tonight, Iran snuck out a claim that it has built a nuclear fusion device. Press TV reports that:The device uses Inertial Electrostatic Confinement method and can produce isotopes and radioisotopes used in diagnosing and curing cancer. The US, Japan, South Korea, Australia and France are the only countries which boast fusion technology. Press TV did not mention North Korea, which claimed to have mastered fusion technology last May. The Iranian boast is not so bold, though. Tehran is not saying it can generate energy through fusion, simply that it can manufacture medical isotopes. The political significance of the claim is clear. It suggests Iran would not need outside help for its Tehran Research Reactor - a need that was once seen as the basis for a short-term compromise on Iran's nuclear programme, or a confidence-building measure at least. But is the claim feasible? There are many bench-top experiments in fusion going on around the world, and at least one relatively low-tech design which seems to resemble the device Press TV is describing, and which has been shown to be a viable neutron source. But can one of these designs make medical isotopes, or is it a hoax? I would be interested to hear from experts.IranNuclear powerJulian Borgerguardian.co.uk © Guardian News & Media Limited 2011 | Use of this content is subject to our Terms & Conditions | More Feeds テヘランにはまだ別の核突破口を主張して、それにある何ですか?世界がエジプト今夜、イランは核融合装置を組み込まれているという主張をこっそり見ていたが

    • Weapons-grade uranium process explained
      The seven main processes involved in making enriched uranium from mined ore1 Uranium ore The mildly radioactive ore is mined from underground or open cast deposits. Iran has mines at Gchine on the Persian Gulf and at Saghand, in the middle of the country.2 Yellowcake When ore comes out of the ground it can be less than 1% uranium oxide. Uranium oxide is leached out of the ore with strong acids or alkaline solutions and dried to 'yellowcake', which is more than 80% uranium oxide. Iran has mastered this process.3 Conversion Yellowcake is processed into a gas, uranium hexafluoride. Iran's conversion plant is at Isfahan.4 Enrichment Uranium hexafluoride can be fed into centrifuges which separate out the most fissile uranium isotope U-235. Low enriched uranium for civilian reactors has a 3%-4% concentration of U-235. 'Weapons-grade' uranium is 90% enriched.5 Fuel fabrication The uranium hexafluoride can be converted back to uranium oxide, which is pressed and baked into pellets. The pellets are put in metal rods, which are used in a reactor. Iran has yet to master this stage.6 Reactor The fission of U-235 produces energy which heats water into steam that drives turbines. Iran has a research reactor in Tehran and an industrial-scale one at Bushehr.7 Reprocessing Uranium and plutonium can be removed from the spent fuel, and reused. The plutonium can also be used to make weapons.IranNuclear weaponsNuclear powerMiddle EastEnergyJulian Borgerguardian.co.uk © Guardian News & Media Limited 2010 | Use of this content is subject to our Terms & Conditions | More Feeds 採掘ore1ウラン鉱石から濃縮ウランを作るに関与する7つの主要なプロセスは、控えめにも放射性鉱石は地下鉄や露天掘りの鉱床から採掘されています


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