Radiobiological effects of tritiated water short-term exposure on V79 clonogenic cell survival

Mattia Siragusa*, Nina Pil Møntegaard Fredericia, Mikael Jensen, Torsten Groesser

*Corresponding author for this work

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    Abstract

    We set out to improve the accuracy of absorbed dose calculations for in-vitro measurements of the Relative Biological Effectiveness (RBE) of tritiated water (HTO) for the clonogenic cell survival assay, also considering the influence of the end-of-track Linear Energy Transfer (LET) of low-energy electrons. The COmputation Of Local Electron Release (COOLER) program was adopted to investigate the cell geometry and the tritium full beta-decay spectrum impact on the S-values and subsequently on the RBE of HTO for clonogenic cell survival at similar high dose rates. S-values for cells growing in suspension are usually comparable to those for adherent cells. RBEs calculated at the 10% survival fraction through the use of the average energy are almost similar to those obtained with the beta-spectrum. For adherent cells, an RBE of 1.6 was found when HTO cell survival curves were compared to acute γ-ray exposures. Irrespective of the geometrical configuration, the RBE was 2.0 when the comparison was made with similar dose rates. These results underline the importance of irradiating at equal dose rates and cell culture conditions when measuring in-vitro RBE-values.
    Original languageEnglish
    JournalInternational Journal of Radiation Biology
    Volume94
    Issue number2
    Pages (from-to)57–165
    ISSN0955-3002
    DOIs
    Publication statusPublished - 2018

    Keywords

    • Auger electrons
    • COOLER
    • HTO
    • RBE
    • S-factors

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