Abstract
The risk of a radiation episode has increased in the last years due to several reasons. In case of a nuclear incident, as with the use of an improvised nuclear device, determination of the radiation doses received by the victims is of utmost importance to define the appropriate medical treatment or to monitor the late effects of radiation. Dose assessment in case of accidents can be performed using commonplace materials found in the accident area. In this paper, the dosimetric properties of monosodium glutamate are investigated by electron spin resonance spectroscopy (ESR), for retrospective and accidental dosimetry. The spectroscopic parameters were optimized to achieve higher signal intensity and better signal-to-noise ratio. As a result, the lowest detectable dose was 0.1 Gy, and monosodium glutamate showed a linear dose–response curve for doses ranging from 0.1 Gy to 10 kGy. The dosimetric signal was monitored from minutes right after irradiation, until 1 year. No changes in the signal intensity were observed over this period, meaning that doses could be assessed immediately after radiation exposure and can still be reconstructed long after the accident. This property also implies that late effects due to victim’s radiation exposure could be better monitored and understood. ESR signal intensity for samples irradiated with a photon energy below 100 keV was decreased by only 27% and no dose-rate dependence was noticed. Therefore, the ability to measure doses as low as 0.1 Gy, the high stability of the dosimetric signal, as well as independence on dose rate, tissue equivalence, low-cost, and wide commercial availability make monosodium glutamate a very good dosimetric material not only for retrospective and accidental but also for medical dosimetry.
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Acknowledgements
This work was supported by the funding agencies FAPESP (Grant 2007/06720-4), CNPq and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001 for partial funding through fellowship and research grants to the authors. The authors thank E. de Paula, C. R. da Silva, and L. Rocha for technical assistance, and A. B. Rech and F. G. Sampaio for the clinical irradiations.
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Guidelli, E.J., Lima, I.S. & Baffa, O. Monosodium glutamate for accidental, retrospective, and medical dosimetry using electron spin resonance. Radiat Environ Biophys 57, 349–356 (2018). https://doi.org/10.1007/s00411-018-0756-3
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DOI: https://doi.org/10.1007/s00411-018-0756-3