The Relative Biological Effectiveness of 22-Mevp X-Rays, Cobalt-60 Gamma Rays, and 200-Kvcp X-Rays: VII. Summary of Studies for Five Criteria of Effect

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Abstract
The results of RBE experiments using LD50 in yeast; LD50 in mice; LD50 rats; Fe59 uptake in rats; LD50 in chicken embryos, as criteria and carefully controlled dosimetry for "standard" 200-kvcp X-radiation and supervoltage radiations, CO60 [gamma]-rays and 22-Mevp X-rays. No differences were observed between the 2 supervoltage radiations, but each was less effective than 200-kvcp X-radiation by a factor of 0.82 to 0.93, (average 0.87) when the absorbed dose to soft tissue was estimated for mammalian endpoints. If the absorbed dose is calculated to bone marrow for rats and mice the 2 supervoltage radiations can be represented as 0.90 [plus or minus] 0.02 times less effective than 200-kvcp X-radiation.