Abstract
Study of heavy ion radiation–induced effects on mice could provide insight into the human health risks of space radiation exposure. The purpose of the present study is to assess the relative biological effectiveness (RBE) of 12C and 28Si ion radiation, which has not been reported previously in the literature. Female C57BL/6J mice (n = 15) were irradiated using 4–8 Gy of 28Si (300 MeV/nucleon energy; LET 70 keV/μm) and 5–8 Gy of 12C (290 MeV/nucleon energy; LET 13 keV/μm) ions. Post-exposure, mice were monitored regularly, and their survival observed for 30 days. The LD50/30 dose (the dose at which 50 % lethality occurred by 30-day post-exposure) was calculated from the survival curve and was used to determine the RBE of 28Si and 12C in relation to γ radiation. The LD50/30 for 28Si and 12C ion is 5.17 and 7.34 Gy, respectively, and the RBE in relation to γ radiation (LD50/30—7.25 Gy) is 1.4 for 28Si and 0.99 for 12C. Determination of RBE of 28Si and 12C for survival in mice is not only important for space radiation risk estimate studies, but it also has implications for HZE radiation in cancer therapy.
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Acknowledgments
This work is supported by National Aeronautics and Space Administration (NASA) Grant #NNX07AH70G and NNX09AU95G. Dr. D. Trani was supported by the National Space Biomedical Research Institute (NSBRI) through NCC 9-58. We are indebted to the members of the NASA Space Radiation Laboratory at the Brookhaven National Laboratory for extending their excellent support for this study.
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Suman, S., Datta, K., Trani, D. et al. Relative biological effectiveness of 12C and 28Si radiation in C57BL/6J mice. Radiat Environ Biophys 51, 303–309 (2012). https://doi.org/10.1007/s00411-012-0418-9
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DOI: https://doi.org/10.1007/s00411-012-0418-9