Dynamic models for estimating radiation doses to hydrobionts in a freshwater ecosystem

Area of Science:

• Environmental science
• Radiological science
• Ecology

Background:

• The Kyshtym accident released radionuclides into freshwater bodies.
• Understanding radiation dose impacts on aquatic ecosystems is crucial for environmental remediation and risk assessment.

Purpose of the Study:

• To present a model for radionuclide transfer and dosimetric assessment in freshwater.
• To reconstruct radiation doses for aquatic biota in Lake Uruskul post-Kyshtym accident.

Main Methods:

• Development of a radionuclide transfer model for freshwater systems.
• Application of dosimetric models to estimate radiation doses for phytoplankton, zooplankton, zoobenthos, and fish.
• Reconstruction of doses over 50 years following the Kyshtym accident.

Main Results:

• Benthic organisms received the highest daily doses (2.6–8.3 Gy).
• Zooplankton and phytoplankton experienced significant doses (up to 3.3 Gy/day and 0.5 Gy/day, respectively).
• Fish received doses up to 4 mGy/day in the initial 100 days post-accident.

Conclusions:

• Radionuclide transfer and dosimetric models provide insights into aquatic ecosystem radiation exposure.
• The reconstructed doses suggest potential for long-term radiation effects on aquatic organisms in Lake Uruskul.
• Internal and external exposure pathways significantly contribute to the overall radiation dose received by aquatic biota.