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Internal in vitro dosimetry for fish using hydroxyapatite-based EPR detectors.

D V Ivanov1, E A Shishkina, D I Osipov

  • 1Institute of Metal Physics, Urals Division of Russian Academy of Sciences, 18, S. Kovalevskaya Str, 620137, Yekaterinburg, Russia, deniv@imp.uran.ru.

Radiation and Environmental Biophysics
|March 31, 2015
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Summary

Researchers developed an Electron Paramagnetic Resonance (EPR) dosimeter using biological hydroxyapatite. This novel dosimeter effectively measures internal ionizing radiation exposure in fish from contaminated aquatic ecosystems.

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Area of Science:

  • Environmental Science
  • Radiological Science
  • Ecotoxicology

Background:

  • Aquatic ecosystems in the Southern Urals were contaminated by Mayak Production Association activities in the 1950s.
  • Fishes in these contaminated lakes are subjects of ongoing research requiring accurate radiation dosimetry.
  • Existing dosimetry methods may not be suitable for in vitro internal dosimetry in fish.

Purpose of the Study:

  • To develop and pilot an Electron Paramagnetic Resonance (EPR) dosimeter for internal dosimetry in fish.
  • To evaluate biological hydroxyapatite as a detecting substance for radiation.
  • To assess the feasibility of using hydroxyapatite point detectors for passive radiation detection in fish.

Main Methods:

  • Biological hydroxyapatite grains were used as point detectors fixed in a solid matrix.
  • Pelletized detectors were covered with Mylar and placed within fish bodies.
  • Detectors were stored in refrigerated conditions for several months for passive dosimetry.

Main Results:

  • The study successfully piloted an EPR dosimeter for internal dosimetry in fish.
  • Biological hydroxyapatite demonstrated sufficient sensitivity for detecting ionizing radiation.
  • The developed dosimeter proved effective for passive detection of radiation in fish from contaminated Southern Urals lakes.

Conclusions:

  • Electron Paramagnetic Resonance (EPR) dosimetry using biological hydroxyapatite is a viable method for internal dosimetry in fish.
  • This technique offers a practical solution for dosimetric support in studies of fish inhabiting radiologically contaminated aquatic environments.
  • The developed dosimeter shows promise for long-term passive monitoring of radiation exposure in aquatic organisms.