Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Retrospective dosimetry using fingernail electron paramagnetic resonance response

  • Noori, Abbas (Department of Physics, Faculty of Science, University of Isfahan) ;
  • Mostajaboddavati, Mojtaba (Department of Physics, Faculty of Science, University of Isfahan) ;
  • Ziaie, Farhood (Radiation Application Research School, Nuclear Science & Technology Research Institute)
  • Received : 2017.05.08
  • Accepted : 2018.01.17
  • Published : 2018.04.25
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Abstract

Human fingernails were used to estimate the radiation dose via electron paramagnetic resonance measurements of radiation-induced radicals. The limiting factors in this research were mechanically induced electron paramagnetic resonance signals due to the mechanical stress during the preparation of the samples. Therefore, different treatment methods of fingernails were used to reduce the mechanically induced signals. The results demonstrate that the mechanically induced and radiation-induced signals have apparently different microwave power saturation behaviors. In addition, the mechanically induced signal shows a fading evolution over time and reaches a constant value. Chemical treatment using the different reagents showed that the minimum mechanically induced signal was obtained using the dithiothreitol reagent. The dose-response curves of the samples treated with dithiothreitol for 30 minutes demonstrated a greater linearity than those of samples treated for 5 minutes. Therefore, to find an unknown absorbed dose in a fingernail sample using a calibration curve, we recommend adopting the mentioned chemical treatment procedure to reduce the uncertainty.

Keywords

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  1. Advances in EPR Dosimetry in Terms of Retrospective Determination of Absorbed Dose in Radiation Accidents vol.41, pp.1, 2018, https://doi.org/10.2478/ctb-2018-0002