Application Area
Nuclear Production
Nuclear systems depend on specific isotopes, not generic elements. Fissile materials, fertile materials, fusion-related isotopes, and specialized nuclear products form the backbone of energy, research, and strategic infrastructure.
Why isotopes matter in nuclear systems
Reactors run because certain nuclei can sustain fission. Fuel cycles matter because some isotopes can be converted into others. Fusion concepts depend on specific hydrogen and lithium isotopes.
The difference between U-235 and U-238 is not academic. It determines whether a fuel system works.
Key nuclear isotopes
U-235
Primary fissile isotope used in most commercial nuclear reactors.
U-238
Dominant natural uranium isotope and a fertile material in fuel cycles.
Pu-239
Key fissile isotope produced in reactors and used in certain fuel-cycle strategies.
Pu-238
Critical for long-lived space power systems.
Th-232
Fertile isotope at the center of thorium fuel cycle research.
U-233
Fissile isotope relevant to thorium-based pathways.
H-2 (Deuterium)
Stable heavy hydrogen isotope used in fusion research.
H-3 (Tritium)
Radioactive hydrogen isotope important to certain fusion approaches.
Li-6
Strategically important for tritium breeding concepts.
Li-7
Relevant in some nuclear system chemistries.
He-3
Scarce strategic isotope with specialized nuclear-related roles.
He-4
Common helium isotope foundational to cryogenics and industrial systems.
Full curated entries live in the Energy & Nuclear section.
Production and supply
Nuclear isotope supply is inseparable from the fuel cycle and national nuclear infrastructure: enrichment, reactors, and specialized production facilities.
For advanced reactors, HALEU and related enrichment pathways have become strategically important. Fusion adds pressure around tritium and lithium isotope management.