Abstract
Chinese hamster ovary (CHO) cells that had been exposed to very low doses of ionizing radiation from incorporated tritiated thymidine or X-rays were shown not to be more resistant to the induction of chromatid aberrations by a subsequent higher dose of ionizing radiation than previously untreated cells. The adaptive response to ionizing radiation was absent both in cells challenged with high doses of X-rays (1.25 Gy) and in cells post-treated with thermal neutrons (0.5-1 x 10(12) n/cm2). In agreement with these observations in CHO cells we were unable to demonstrate an adaptive response to X-rays also in human lymphocytes from five different donors.
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