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Thanks this helps a lot. One other Q: if the pellets spill, how dangerous are they from a radioactivity perspective?

• acidburnNSA 7y ago
  Unshielded but intact pebbles would emit extraordinarily high amounts of radiation that falls off with 1/r^2 by geometric attenuation. Picking them up and putting them back in a shield would require remote handling (long tools and/or robots). But once they're all picked up and re-shielded, the radiation would be gone. Much different from spilling a vat of radioactive liquid which is much harder to clean.