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| rdfs:comment | - Archeological evidence suggests the ancient Protheans used helium-3, as there is evidence of helium-3 mining on planets such as Zafe and Sharring in formerly Prothean-inhabited systems. It is also believed that the ancient arthenn civilization mined helium-3 on Gaelon. Before its facilities were destroyed in the Krogan Rebellions, the planet Vard was the key helium-3 producer for all of krogan space - its destruction by Citadel Spectres early in the wars was a strategic setback that the krogan fleets never fully recovered from. The original facilities had been constructed with salarian aid.
- Helium 3 (also written as Helium-3 and abbreviated as He3 or He-3) is an English record label. Formed by alternative rock band Muse in 2006, Helium 3 is a subdivision of Warner Music Group, one of the 'Big Three' record companies. Beginning with the single "Supermassive Black Hole", the label has issued Muse releases since 2006, working internationally with Warner Bros. Records, A&E Records and the various regional Warner Music labels. The name of the record label is derived from Helium-3, a rare isotope of the noble gas helium which can be theoretically be used in the future for energy production through Nuclear fusion.
- (hē´•lē•ėm-3) A stable isotope of the gaseous chemical element; symbol He3; atomic number 2; atomic weight 3.0026; melting point below 272°A at 26 atmospheres pressure; boiling point 268.934°A at 1 atmosphere pressure; density 0.1785 grams per liter at STP ; valence usually 0. Spectroscopic evidence for the presence of helium in the sun was first obtained during a solar eclipse in 1868 CE. A bright yellow emission line was observed and was later shown to correspond to no known element; the new element was named by J. N. Lockyer and E. Frankland from Helios [Gr., sun]. Helium was isolated (1895 CE) from a sample of the uranium mineral cleveite by Sir William Ramsay.
- Helium-3 (He-3) is a light, non-radioactive isotope of helium with two protons and oneneutron, in contrast with two neutrons in common helium. Its hypothetical existence was first proposed in 1934 by the Australian nuclear physicist Mark Oliphant while he was working at the University of Cambridge Cavendish Laboratory. Oliphant had performed experiments in which fast deuterons collided with deuteron targets (incidentally, the first demonstration of nuclear fusion).[1] Helium-3 was thought to be aradioactive isotope until helions were also found in samples of natural helium, which is mostly helium-4, taken both from the terrestrial atmosphere and from natural gaswells.[2]
- The helion, the nucleus of a helium-3 atom, consists of two protons but only one neutron, in contrast to two neutrons in ordinary helium. Its existence was first proposed in 1934 by the Australian nuclear physicist Mark Oliphant while based at Cambridge University's Cavendish Laboratory, in an experiment in which fast deuterons were reacted with other deuteron targets (the first demonstration of nuclear fusion). Helium-3, as an isotope, was postulated to be radioactive, until helions from it were accidentally identified as a trace "contaminant" in a sample of natural helium (which is mostly helium-4) from a gas well, by Luis W. Alvarez and Robert Cornog in a cyclotron experiment at the Lawrence Berkeley National Laboratory, in 1939. The presence of helium-3 in underground gas deposits impl
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| abstract | - Archeological evidence suggests the ancient Protheans used helium-3, as there is evidence of helium-3 mining on planets such as Zafe and Sharring in formerly Prothean-inhabited systems. It is also believed that the ancient arthenn civilization mined helium-3 on Gaelon. Before its facilities were destroyed in the Krogan Rebellions, the planet Vard was the key helium-3 producer for all of krogan space - its destruction by Citadel Spectres early in the wars was a strategic setback that the krogan fleets never fully recovered from. The original facilities had been constructed with salarian aid.
- Helium 3 (also written as Helium-3 and abbreviated as He3 or He-3) is an English record label. Formed by alternative rock band Muse in 2006, Helium 3 is a subdivision of Warner Music Group, one of the 'Big Three' record companies. Beginning with the single "Supermassive Black Hole", the label has issued Muse releases since 2006, working internationally with Warner Bros. Records, A&E Records and the various regional Warner Music labels. The name of the record label is derived from Helium-3, a rare isotope of the noble gas helium which can be theoretically be used in the future for energy production through Nuclear fusion.
- Helium-3 (He-3) is a light, non-radioactive isotope of helium with two protons and oneneutron, in contrast with two neutrons in common helium. Its hypothetical existence was first proposed in 1934 by the Australian nuclear physicist Mark Oliphant while he was working at the University of Cambridge Cavendish Laboratory. Oliphant had performed experiments in which fast deuterons collided with deuteron targets (incidentally, the first demonstration of nuclear fusion).[1] Helium-3 was thought to be aradioactive isotope until helions were also found in samples of natural helium, which is mostly helium-4, taken both from the terrestrial atmosphere and from natural gaswells.[2] Helium-3 occurs as a primordial nuclide, escaping from the Earth's crust into the atmosphere and into outer space over millions of years. Helium-3 is also thought to be a natural nucleogenic and cosmogenic nuclide, one produced when lithium is bombarded by natural neutrons. Those are released by spontaneous fission and bynuclear reactions with cosmic rays. Some of the helium-3 found in the terrestrial atmosphere is also a relic of atmospheric and underwater nuclear weapons testing, conducted by the three big nuclear powers before 1963. Most of this comes from the decay of tritium (hydrogen-3), which decays into helium-3 with a half life of 12.3 years. Furthermore, some nuclear reactors (landbound or shipbound) periodically release some helium-3 and tritium into the atmosphere. The nuclear reactor disaster at Chernobyl released a huge amount of radioactive tritium into the atmosphere, and smaller accidents have caused smaller releases. Furthermore, significant amounts of tritium and helium-3 have been deliberately produced in national arsenal nuclear reactors by the irradiation of lithium-6. The tritium is used to "boost" nuclear weapons, and some of this inevitably escapes during its production, transportation, and storage. Hence, helium-3 enters the atmosphere both through its direct release and through theradioactive decay of tritium. The abundance of helium-3 is thought to be greater on the Moon than on Earth, having been embedded in the upper layer of regolith by the solar wind over billions of years,[3]though still lower in quantity than in the solar system's gas giants.[4][5]
- The helion, the nucleus of a helium-3 atom, consists of two protons but only one neutron, in contrast to two neutrons in ordinary helium. Its existence was first proposed in 1934 by the Australian nuclear physicist Mark Oliphant while based at Cambridge University's Cavendish Laboratory, in an experiment in which fast deuterons were reacted with other deuteron targets (the first demonstration of nuclear fusion). Helium-3, as an isotope, was postulated to be radioactive, until helions from it were accidentally identified as a trace "contaminant" in a sample of natural helium (which is mostly helium-4) from a gas well, by Luis W. Alvarez and Robert Cornog in a cyclotron experiment at the Lawrence Berkeley National Laboratory, in 1939. The presence of helium-3 in underground gas deposits implied that it either did not decay or had an extremely long half-life compatible with a primordial isotope. Helium-3 is proposed as a second-generation fusion fuel for fusion power uses. Tritium decays into helium-3 with a 12 year half-life. Tritium produced for other uses evolves helium-3 which can be recovered. Irradiation of lithium in a nuclear reactor — either a fusion or fission reactor — can also produce tritium, and helium-3 after decay.
- (hē´•lē•ėm-3) A stable isotope of the gaseous chemical element; symbol He3; atomic number 2; atomic weight 3.0026; melting point below 272°A at 26 atmospheres pressure; boiling point 268.934°A at 1 atmosphere pressure; density 0.1785 grams per liter at STP ; valence usually 0. Spectroscopic evidence for the presence of helium in the sun was first obtained during a solar eclipse in 1868 CE. A bright yellow emission line was observed and was later shown to correspond to no known element; the new element was named by J. N. Lockyer and E. Frankland from Helios [Gr., sun]. Helium was isolated (1895 CE) from a sample of the uranium mineral cleveite by Sir William Ramsay.
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