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. 2017 Jul 11;58(6):803–808. doi: 10.1093/jrr/rrx030

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© The Author 2017. Published by Oxford University Press on behalf of The Japan Radiation Research Society and Japanese Society for Radiation Oncology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Fig. 1. — Repair–time kinetics of the cell survival fraction after split dose irradiation. Upper panel: SAS cells irradiated with both primary and secondary radiations of 290 MeV/u carbon with 6 cm SOBP beams at the middle position, with an interval time. Lower panel: V79 cells irradiated with monoenergetic iron ions at 440 keV/μm, carbon ions at 100 keV/μm, or 150 kVp X-ray beams as the priming radiation, with an interval time, followed by secondary 150 keV X-rays. The dose for primary irradiation was selected to give a 10% survival rate, and that for secondary irradiation was selected to give another 10% survival at an interval time of zero (i.e. 1% survival in total). The cells were kept at different times (t) at 25°C for repair.