Assessing radiation dosimetry for microorganisms in naturally radioactive mineral springs using GATE and Geant4-DNA Monte Carlo simulations.

Autor: Kolovi S; Laboratoire de Physique de Clermont (LPC) - UMR6533, CNRS/IN2P3 Université Clermont Auvergne, Aubière, France.; LTSER 'Zone Atelier Territoires Uranifères', Clermont-Ferrand, France., Fois GR; Laboratoire de Physique de Clermont (LPC) - UMR6533, CNRS/IN2P3 Université Clermont Auvergne, Aubière, France., Lanouar S; Laboratoire de Physique de Clermont (LPC) - UMR6533, CNRS/IN2P3 Université Clermont Auvergne, Aubière, France., Chardon P; Laboratoire de Physique de Clermont (LPC) - UMR6533, CNRS/IN2P3 Université Clermont Auvergne, Aubière, France.; LTSER 'Zone Atelier Territoires Uranifères', Clermont-Ferrand, France., Miallier D; Laboratoire de Physique de Clermont (LPC) - UMR6533, CNRS/IN2P3 Université Clermont Auvergne, Aubière, France.; LTSER 'Zone Atelier Territoires Uranifères', Clermont-Ferrand, France., Baker LA; LTSER 'Zone Atelier Territoires Uranifères', Clermont-Ferrand, France.; Laboratoire Microorganismes: Génome Environnement (LMGE) - UMR6023, CNRS, Université Clermont Auvergne, Clermont-Ferrand, France.; Laboratoire de Géographie Physique et Environnementale (GEOLAB) - UMR6042, CNRS, Université Clermont Auvergne, Clermont-Ferrand, France., Bailly C; LTSER 'Zone Atelier Territoires Uranifères', Clermont-Ferrand, France.; Laboratoire de Physique Subatomique et des Technologies Associées (SUBATECH) - UMR6457, CNRS/IN2P3/IMT Atlantique/Université de Nantes, Nantes, France., Beauger A; LTSER 'Zone Atelier Territoires Uranifères', Clermont-Ferrand, France.; Laboratoire Microorganismes: Génome Environnement (LMGE) - UMR6023, CNRS, Université Clermont Auvergne, Clermont-Ferrand, France., Biron DG; LTSER 'Zone Atelier Territoires Uranifères', Clermont-Ferrand, France.; Laboratoire Microorganismes: Génome Environnement (LMGE) - UMR6023, CNRS, Université Clermont Auvergne, Clermont-Ferrand, France., David K; LTSER 'Zone Atelier Territoires Uranifères', Clermont-Ferrand, France.; Laboratoire de Physique Subatomique et des Technologies Associées (SUBATECH) - UMR6457, CNRS/IN2P3/IMT Atlantique/Université de Nantes, Nantes, France., Montavon G; LTSER 'Zone Atelier Territoires Uranifères', Clermont-Ferrand, France.; Laboratoire de Physique Subatomique et des Technologies Associées (SUBATECH) - UMR6457, CNRS/IN2P3/IMT Atlantique/Université de Nantes, Nantes, France., Pilleyre T; Laboratoire de Physique de Clermont (LPC) - UMR6533, CNRS/IN2P3 Université Clermont Auvergne, Aubière, France.; LTSER 'Zone Atelier Territoires Uranifères', Clermont-Ferrand, France., Schoefs B; LTSER 'Zone Atelier Territoires Uranifères', Clermont-Ferrand, France.; Metabolism, Molecular Engineering of Microalgae and Applications, Laboratoire de Biologie des Organismes, Stress, Santé Environnement, IUML FR3473, CNRS, Le Mans University, Le Mans, France., Breton V; Laboratoire de Physique de Clermont (LPC) - UMR6533, CNRS/IN2P3 Université Clermont Auvergne, Aubière, France.; LTSER 'Zone Atelier Territoires Uranifères', Clermont-Ferrand, France., Maigne L; Laboratoire de Physique de Clermont (LPC) - UMR6533, CNRS/IN2P3 Université Clermont Auvergne, Aubière, France.; LTSER 'Zone Atelier Territoires Uranifères', Clermont-Ferrand, France.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2023 Oct 12; Vol. 18 (10), pp. e0292608. Date of Electronic Publication: 2023 Oct 12 (Print Publication: 2023).
DOI: 10.1371/journal.pone.0292608
Abstrakt: Mineral springs in Massif Central, France can be characterized by higher levels of natural radioactivity in comparison to the background. The biota in these waters is constantly under radiation exposure mainly from the α-emitters of the natural decay chains, with 226Ra in sediments ranging from 21 Bq/g to 43 Bq/g and 222Rn activity concentrations in water up to 4600 Bq/L. This study couples for the first time micro- and nanodosimetric approaches to radioecology by combining GATE and Geant4-DNA to assess the dose rates and DNA damages to microorganisms living in these naturally radioactive ecosystems. It focuses on unicellular eukaryotic microalgae (diatoms) which display an exceptional abundance of teratological forms in the most radioactive mineral springs in Auvergne. Using spherical geometries for the microorganisms and based on γ-spectrometric analyses, we evaluate the impact of the external exposure to 1000 Bq/L 222Rn dissolved in the water and 30 Bq/g 226Ra in the sediments. Our results show that the external dose rates for diatoms are significant (9.7 μGy/h) and comparable to the threshold (10 μGy/h) for the protection of the ecosystems suggested by the literature. In a first attempt of simulating the radiation induced DNA damage on this species, the rate of DNA Double Strand Breaks per day is estimated to 1.11E-04. Our study confirms the significant mutational pressure from natural radioactivity to which microbial biodiversity has been exposed since Earth origin in hydrothermal springs.
Competing Interests: The authors have declared that no competing interests exist.
(Copyright: © 2023 Kolovi et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
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