That's stated pretty explicitly--even for those few most directly exposed in accidents--in the discussion section of the paper you link (which my first linked paper was a followup study to, 20 years later, btw), and it was found to be true in the larger population of nuclear material workers in the second paper (who were, indeed, working in an environment where much more was known about how to control the dangers of what they were working with).
Another important point is to people who don't understand the physics, something not understood "must" be feared, therefore the most dangerous part must have been the physics. However I understand at least some of the chemistry and industrial processes using bulk hydrofluoric scare me more than the physics. Aside from the mechanical / explosive hazards, of course (machine plastic explosives to precise shapes on a milling machine for the implosion weapons, are you insane? You're hooking up a zillion blasting caps to .. what?)
http://www.orau.org/ptp/pdf/accidentsurvivorslanl.pdf