Not an expert, but I'd think the A-bombed cities provided numerous examples of all the range of possible radiation contamination in humans, from "negligible" to

Not an expert, but I'd think the A-bombed cities provided numerous examples of all the range of possible radiation contamination in humans, from "negligible" to "fatal in hours" and possibly beyond. (I'm assuming a 1-dimensional scale here, which may be a mistake) Why would the total radiation of the event matter at all? All the radiation that an individual may receive beyond "fatal in hours" will not be relevant to their reproductive future. (Except in the contrived scenario in which a male receives enough radiation to kill him in hours, but still conceives a child in these hours)