These guys have it right:

… It is wrong to compare internal emitters with external emitters, ie, ingesting radioactive isotopes versus in-flight exposure or background radiation. It is like comparing warming oneself near a fire versus eating a red hot coal. [my emphasis] …

They go further into the difference between radiation and contamination by ingestion of radioisotopes, which is worth a read to those who need some grounding in these concepts.


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