Apr 9 1971
From The Space Library
Cosmic ray tracks found in helmets of Apollo astronauts had indicated that exposure during space mission was sufficient to damage certain nonreplaceable cells on long flights, General Electric R&D Center team reported in Science. On two-year mission, fraction of cells killed could rise to 0.12% in cerebral cortex, 0.05% in retina, and more than 1.5% for giant cells. Proportions might be "highly worrisome, since additional safe shielding would impose important weight considerations on spacecraft design." (Comstock, Fleischer, et al., Science, 4/9/71, 154-6 )
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