helium-3
Generated by GPT-5-miniExpansion Funnel Raw 66 → Dedup 13 → NER 13 → Enqueued 10
| helium-3 | |
|---|---|
| Name | Helium-3 |
| Phase | Gas (standard conditions) |
| Density | 0.134 kg/m³ (gas) |
| Boiling point | 3.19 K |
| Discovery | 1939 (isotope identified in 1939) |
helium-3
Introduction
helium-3 is a light, stable isotope of Helium distinguished by a nucleus of two protons and one neutron. It is notable in Nuclear fusion research, low-temperature physics pioneered by Pyotr Kapitsa and John Bardeen, and space resource discussions involving NASA and national space agencies such as the China National Space Administration and the European Space Agency. Interest spans academic laboratories at institutions like Massachusetts Institute of Technology and applied programs at corporations including Lockheed Martin and Virgin Galactic.
Properties
helium-3 exhibits quantum properties exploited in Cryogenics experiments at facilities like CERN and universities such as Harvard University and University of Cambridge. Its nuclear spin (1/2) gives rise to applications in Nuclear magnetic resonance carried out by groups at Stanford University and Max Planck Society institutes. Compared with Helium-4, helium-3 has different superfluid phases observed in experiments by researchers at Low Temperature Laboratory (Aalto University) and historically by teams led by Douglas Osheroff and Robert Coleman Richardson. Thermodynamic properties influence work at Los Alamos National Laboratory and Princeton Plasma Physics Laboratory.
Natural occurrence and production
helium-3 occurs in small concentrations in the Earth's atmosphere and is produced by Cosmic ray interactions studied by researchers at Jet Propulsion Laboratory and observatories such as Mauna Kea Observatories. Terrestrial sources include release from radioactive decay chains in minerals analyzed by teams at United States Geological Survey and Geological Survey of Canada. Lunar regolith concentrations were measured during missions by Apollo program astronauts and instruments from agencies like Roscosmos and Indian Space Research Organisation. Man‑made production arises in Nuclear reactors and during Tritium decay in facilities such as Savannah River Site and experiments at Oak Ridge National Laboratory.
Applications and uses
helium-3 finds specialized use in Cryogenics for dilution refrigerators employed by groups at IBM and Bell Labs for quantum computing research at Google and Microsoft Research. Its properties enable neutron detection in instruments developed by manufacturers selling to Department of Homeland Security and research centers like Argonne National Laboratory. Fusion research programs at ITER and private ventures connected to Tokamak Energy consider helium-3 for aneutronic fusion concepts inspired by proposals from Freeman Dyson and theoretical work appearing in journals associated with American Physical Society. Medical imaging experiments using hyperpolarized isotopes have been conducted at hospitals affiliated with Mayo Clinic and Johns Hopkins Hospital.
Resource potential and extraction
helium-3 gained prominence in resource debates concerning the Moon following analyses by Lunar and Planetary Institute and policy studies from RAND Corporation. Proposals for extraction involve robotic missions similar to those by Lunar Reconnaissance Orbiter and commercial concepts advanced by companies like Planetary Resources and ispace. Geological sourcing on Earth has been proposed in association with Natural gas fields exploited by firms such as ExxonMobil and Gazprom and evaluated by national labs including Sandia National Laboratories. International law discussions touch agencies like the United Nations and treaties negotiated following precedents set by the Outer Space Treaty as nations plan prospecting activities.
Safety and handling
Handling of helium-3 falls under laboratory safety protocols enforced at institutions like Occupational Safety and Health Administration‑regulated facilities and national laboratories including Brookhaven National Laboratory. Storage and transport practices follow guidelines used by organizations such as International Air Transport Association for cryogenic gases and by infrastructure providers like Air Products and Chemicals, Inc. to manage pressurized cylinders and cryostats. Emergency response planning often references training from Federal Emergency Management Agency and coordination with local agencies when working with large cryogenic systems.