Relative biological efficiency of 1000-kvp and 250-kvcp x-rays.  V.  Determinations based on the LD50 of the 4-day-old chick embryo.
D000818:Animals; D002642:Chick Embryo; D006801:Humans; D007928:Lethal Dose 50; D014965:X-Rays
ROENTGEN RAYS/effects