Helium-3
A stable isotope of helium whose nucleus contains two protons and one neutron. It is a fermion with a superfluid transition temperature of approximately 0.002 K. Extremely rare in nature, it is used primarily in dilution refrigerators, quantum computing, and fundamental physics research.
Timeline (last 90 days)
Some laboratories have achieved helium-3 recovery rates exceeding 90%.
The lunar surface, having long been bombarded by the solar wind, holds relatively abundant helium-3, but extracting and transporting it remains in the realm of science fiction.
Currently, helium-3 for global scientific research relies mainly on inventories produced by the decay of tritium in nuclear weapons, plus a small amount of by-products from nuclear reactors.
The price of helium-3 once soared to several thousand dollars per liter.
As the global nuclear disarmament process advances and the number of nuclear warheads declines, the by-product source of helium-3 is also shrinking; meanwhile, demand for helium-3 from quantum computing and low-temperature physics research continues to grow, and this supply-demand contradiction may push up prices and affect the feasibility of frontier experiments.
Helium-3 and helium-4 are the two stable isotopes of helium; a helium-4 nucleus contains 2 protons and 2 neutrons, while helium-3 contains 2 protons and 1 neutron.
Helium-4 transitions to a superfluid at 2.17K, whereas helium-3, being a fermion, has a superfluid transition temperature of about 0.002K.
The U.S. Department of Energy (DOE) accumulated a helium-3 stockpile due to the decay of tritium in nuclear warheads during the Cold War, and sells it as a byproduct to scientific and industrial users.
Dilution refrigeration technology could only be scaled up after nuclear weapons stockpiles appeared, because the helium-3 produced by tritium decay in nuclear warheads is a key resource required by dilution refrigerators.
Dilution refrigerators are key cooling devices for equipment such as quantum computers, superconducting quantum interference devices (SQUIDs), and astronomical detectors, and helium-3 is an irreplaceable working medium in their operation.
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All Facts (15)
Some laboratories have achieved helium-3 recovery rates exceeding 90%.
50%UnverifiedDilution refrigerators are key cooling devices for equipment such as quantum computers, superconducting quantum interference devices (SQUIDs), and astronomical detectors, and helium-3 is an irreplaceable working medium in their operation.
50%UnverifiedThe concentration of helium-3 in Earth's atmosphere is only about one part per million of helium-4; natural gas fields are the main source of commercial helium, and their helium-3 content is likewise negligible.
50%UnverifiedThe lunar surface, having long been bombarded by the solar wind, holds relatively abundant helium-3, but extracting and transporting it remains in the realm of science fiction.
50%UnverifiedCurrently, helium-3 for global scientific research relies mainly on inventories produced by the decay of tritium in nuclear weapons, plus a small amount of by-products from nuclear reactors.
50%UnverifiedThe price of helium-3 once soared to several thousand dollars per liter.
50%UnverifiedHelium-3 and helium-4 are the two stable isotopes of helium; a helium-4 nucleus contains 2 protons and 2 neutrons, while helium-3 contains 2 protons and 1 neutron.
50%UnverifiedHelium-4 transitions to a superfluid at 2.17K, whereas helium-3, being a fermion, has a superfluid transition temperature of about 0.002K.
50%UnverifiedThe U.S. Department of Energy (DOE) accumulated a helium-3 stockpile due to the decay of tritium in nuclear warheads during the Cold War, and sells it as a byproduct to scientific and industrial users.
50%UnverifiedDilution refrigeration technology could only be scaled up after nuclear weapons stockpiles appeared, because the helium-3 produced by tritium decay in nuclear warheads is a key resource required by dilution refrigerators.
50%UnverifiedHelium-3 is an extremely scarce helium isotope, with an estimated approximately 1 million tonnes deposited in lunar soil through solar wind.
50%UnverifiedThe fusion reaction of helium-3 and deuterium produces almost no neutrons, making it theoretically cleaner and safer than conventional nuclear fusion, with an extremely high energy density per unit mass.
50%UnverifiedControlled nuclear fusion has not yet been commercialized on Earth, and the infrastructure required to mine helium-3 on a large scale from the Moon and transport it back remains far out of reach.
50%UnverifiedThe lunar south pole possesses water ice resources, potential helium-3 reserves, and a strategic location as a stepping stone for deep space exploration.
50%UnverifiedAs the global nuclear disarmament process advances and the number of nuclear warheads declines, the by-product source of helium-3 is also shrinking; meanwhile, demand for helium-3 from quantum computing and low-temperature physics research continues to grow, and this supply-demand contradiction may push up prices and affect the feasibility of frontier experiments.
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