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| Radioisotope power systems | |
|---|---|
| Name | Radioisotope power systems |
| Caption | Schematic of a radioisotope thermoelectric generator |
| Invented | 1950s |
| Inventor | United States Atomic Energy Commission |
| Major uses | Spacecraft power, remote terrestrial stations |
Radioisotope power systems provide electrical power using heat from radioactive decay and are used where Apollo, Voyager, Galileo, Cassini–Huygens, New Horizons or Curiosity missions required long-lived, reliable power. Developed during the Cold War era by institutions including the United States Atomic Energy Commission, Oak Ridge National Laboratory, and contractors such as General Electric, these systems combine nuclear materials and energy conversion devices to supply electricity for instruments, heaters, and communications on missions to Outer space destinations like Jupiter, Saturn, and Pluto. Their development involved cross-cutting work with agencies such as the National Aeronautics and Space Administration and laboratories including Los Alamos National Laboratory and Lawrence Livermore National Laboratory.
Radioisotope power systems use the decay heat of radioisotopes such as Plutonium-238 to produce electricity via converters developed by teams from Jet Propulsion Laboratory and vendors like Teledyne Energy Systems, with deployment on platforms from Voyager 1 to Curiosity (rover), marrying expertise from Argonne National Laboratory, Sandia National Laboratories, and industrial partners including Boeing and Lockheed Martin. Their energy density and longevity made them essential for exploration beyond the range of solar panels in missions run by European Space Agency, Roscosmos, Indian Space Research Organisation, and cooperative programs like International Space Station logistics studies. Policy oversight and certification involve agencies such as the Department of Energy (United States) and regulators including the Nuclear Regulatory Commission for terrestrial applications and contingency planning with organizations like the Federal Emergency Management Agency.
Design integrates a radioisotope heat source containing fuel forms of Plutonium-238 or alternatives such as Strontium-90 inside robust containment engineered by teams from Oak Ridge National Laboratory and manufactured under standards from American Society of Mechanical Engineers. Heat is converted to electricity using devices like thermoelectric converters developed at Jet Propulsion Laboratory and thermophotovoltaic cells researched at Stanford University and Massachusetts Institute of Technology, or dynamic converters such as Stirling engines advanced by Cleveland Electric teams and flight prototypes built in collaboration with NASA Glenn Research Center. Thermal management, shielding, and structural interfaces are tested at facilities including Sandia National Laboratories and Los Alamos National Laboratory to meet launch safety criteria coordinated with launch providers like United Launch Alliance and SpaceX.
Major classes include radioisotope thermoelectric generators pioneered by Bell Laboratories, radioisotope heater units used on small probes built by Teledyne Brown Engineering, and advanced systems such as the Stirling-based radioisotope generator flight demonstrations supported by NASA Glenn Research Center and industry partners like Sunpower Inc.. Variants incorporate fuel in forms characterized by Oak Ridge National Laboratory materials science groups and produce electricity through thermoelectric materials researched at Pennsylvania State University, thermophotovoltaic architectures explored at University of California, Berkeley, or dynamic converters prototyped by teams at Aerojet Rocketdyne.
Radioisotope power systems have flown on landmark missions including Pioneer 10, Pioneer 11, Voyager 2, Galileo (spacecraft), Ulysses (spacecraft), Cassini–Huygens, New Horizons, and Mars Science Laboratory, supporting payloads developed by institutions such as Jet Propulsion Laboratory, California Institute of Technology, and Southwest Research Institute. Terrestrial uses include remote buoys and navigation aids serviced by manufacturers like Lockheed Martin and deployed in collaboration with agencies such as the National Oceanic and Atmospheric Administration and United States Coast Guard. Scientific research programs at observatories managed by Smithsonian Institution teams and planetary science investigations under the Planetary Society have relied on radioisotope sources for sustained operations in extreme environments like Europa-analog testbeds and polar research stations supported by National Science Foundation funding.
Safety design, emergency planning, and environmental assessments involve regulators and laboratories including the Environmental Protection Agency, Department of Energy (United States), Nuclear Regulatory Commission, Sandia National Laboratories, and Lawrence Livermore National Laboratory. Containment strategies and accident scenarios reference standards and exercises coordinated with Federal Aviation Administration and international partners such as European Space Agency safety panels. Environmental impact studies have been informed by work at Yellowstone National Park-adjacent research programs and community engagement with entities like State of New Mexico authorities when production or transport operations occur near sites such as Los Alamos National Laboratory.
Early development in the 1950s and 1960s involved programs at Oak Ridge National Laboratory, Los Alamos National Laboratory, and Bell Labs for thermoelectric devices, with milestones including flight qualification on Transit (satellite), programmatic decisions by the United States Atomic Energy Commission, and later stewardship by the Department of Energy (United States). Cold War-era investments tied to strategic initiatives at Sandia National Laboratories and demonstration flights on Pioneer and Voyager missions established operational heritage, while later revitalization for missions like New Horizons and Mars 2020 involved partnerships among NASA, DOE, and industry suppliers such as Aerojet Rocketdyne.
Future work explores increased specific power and fuel security through renewed production of Plutonium-238 at facilities including Oak Ridge National Laboratory and production partners like Idaho National Laboratory, advanced conversion technologies from research teams at Massachusetts Institute of Technology and Stanford University, and mission concepts targeting Europa Clipper, outer planet probes proposed by NASA Jet Propulsion Laboratory and international collaborations with European Space Agency and Japan Aerospace Exploration Agency. Policy, export controls, and international cooperation will engage entities such as the White House and United Nations bodies as deployment scales and commercial interest from companies like SpaceX and Blue Origin intersect with civil and scientific priorities.