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Sorry to be a wet blanket but this is what first came to mind:
If the free radical scavengers have to be administered PRIOR to exposure, how would it help in a real life situation? You don't _expect_ people to be exposed to high levels of ionizing radiation - such exposure would only happen in the case of an accident, by definition impossible to predict.
Someone might suggest giving it to people at risk of exposure on a regular basis, but we don't know - by a long way - if the risk of chronic dosage of nanotubes outweighs the potential protection from a containment failure.
~~Xenobiologista