Helium-3 Handling Safety
Helium-3 is a stable, non-radioactive, inert gas — the burner's fuel poses no radiological handling hazard.
The burner (Aegis / MetroVolt) fuses deuterium with helium-3. Unlike tritium, helium-3 is stable and non-radioactive: it is an inert noble gas with no decay, no penetrating radiation, and no chemical toxicity. As a fuel it removes the dominant radiological hazard that D–T machines must manage.
Handling profile
- Non-radioactive: stable isotope, no decay, no dose.
- Inert: chemically unreactive, non-flammable, non-toxic.
- Simple asphyxiation control: like any inert gas, manage in confined spaces with ventilation.
- High value, so recovered: handled in closed systems to conserve it, not because of hazard.
Helium-3 for the burner is produced in the breeder (Hyperion) at roughly 1.97 kg/yr alongside its tritium output, and by tritium decay. Its scarcity, not its hazard, drives the care taken with it; closed-loop handling conserves a strategic material. The 5.44% neutron fraction of the D–³He reaction also means the burner produces far fewer neutrons than a D–T machine.
What remains to manage
The burner still involves deuterium (a flammable gas), high magnetic fields, and stored electrical energy from direct energy conversion. But its fuel itself is among the most benign of any energy technology. See deuterium safety.
A fuel that is stable, inert, and non-toxic is a structural safety advantage of the D–³He path.