PMID: 6969231Oct 1, 1980Paper

Negative pion irradiation of mammalian cells. III. A comparative analysis of DNA strand breakage, repair and cell survival after exposure to pi-mesons and X-rays

International Journal of Radiation Biology and Related Studies in Physics, Chemistry, and Medicine
K F WeibezahnT Coquerelle

Abstract

The yields of immediate and residual breaks in DNA of X- and peak pion irradiated Chinese hamster cells were measured by hydroxylapatite chromatography in order to investigate the r.b.e. of immediate break production and the relation between residual breaks and survival in the same low dose range of up to 10 Gy. A linear dose response for immediate break induction was observed with an r.b.e. of 0.37 for peak pions, whereas the formation of residual breaks showed a linear-quadratic dose dependence for both types of radiation. The dose-effect curves of residual break can directly be correlated with the corresponding survival curves for both radiation types used indicating that residual breaks are lethal events (most probably unrepaired double strand breaks) formed in this low dose range by single- and multi-hit interactions. Despite their lower efficiency in formation of immediate breaks peak pions produce more residual breaks per dose than X-rays.

References

Jan 1, 1977·International Journal of Radiation Oncology, Biology, Physics·J D ChapmanR C Urtasun
Mar 23, 1978·Nature·D T GoodheadR Cox
Mar 1, 1976·Proceedings of the National Academy of Sciences of the United States of America·D L DugleJ D Chapman
Mar 1, 1972·The British Journal of Radiology·M R RajuG W Barendsen

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Citations

Nov 1, 1981·Physics in Medicine and Biology·P R Burch, M S Chesters

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