The following radioactive materials cannot be transported by aircraft to, from or over Canada without prior authorization.

Nuclear Substance | Form | Quantity
--- | --- | ---
Plutonium1 | Unirradiated | More than 15 g
Uranium 235 | Unirradiated - uranium enriched to 20% 235U or more | More than 15 g
Uranium 235 | Unirradiated - uranium enriched to 10% 235U or more, but less than 20% 235U | More than 1 kg
Uranium 235 | Unirradiated - uranium enriched above natural, but less than 10%235U | 10 kg
Uranium 233 | Unirradiated | More than 15 g
Fuel consisting of depleted or natural uranium, thorium or low-enriched fuel (less than 10% fissile content) | Irradiated | More than 15 g

1All plutonium except that with isotopic concentration exceeding 80% in plutonium 238.