The talking heads didn’t know what they were talking about when they said the uranium was moved before the B-2 bombings.
Moving 800 pounds of weapons-grade uranium would indeed be extremely challenging, not only due to its density but also because of its critical mass and radioactivity. Here’s why:
- Critical Mass: Weapons-grade uranium, typically enriched to 90% uranium-235, has a relatively low critical mass (the minimum amount needed to sustain a nuclear chain reaction). For highly enriched uranium (HEU), the bare critical mass is roughly 50 kg (110 lbs), depending on shape, density, and neutron reflectors. Transporting 800 pounds (363 kg) far exceeds this, posing a severe risk of accidental criticality if improperly handled or configured (e.g., if compressed or surrounded by neutron-reflecting materials). Criticality could lead to a nuclear chain reaction, releasing intense radiation and potentially causing an explosion.
- Radioactivity: Uranium-235 is radioactive, emitting alpha particles and some gamma radiation. While alpha particles are less penetrating, the sheer quantity (800 pounds) would produce significant radiation exposure risks, requiring heavy shielding (e.g., lead or specialized containers) to protect handlers. This shielding adds substantial weight and complexity to transport. Prolonged exposure without protection could cause severe health effects, including radiation poisoning.
- Logistical Challenges: Beyond critical mass and radioactivity, the material’s density (19.1 g/cm³) means 800 pounds occupies a small volume (19 liters or ~5 gallons), making it deceptively compact but heavy. Handling requires specialized equipment, secure containment, and strict regulatory oversight due to its strategic and hazardous nature.