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Air kerma rate from radionuclides distributed in forest ecosystem
1Saint-Petersburg Research Institute of Radiation Hygiene after Professor P.V. Ramzaev, 8 Mira Str., 197101, Saint-Petersburg, Russian Federation.
Journal of Environmental Radioactivity
|August 27, 2023
Summary
This study quantifies radiation dose rates in forests, finding that forest biomass can reduce air kerma rates by 15-20% near the ground. These findings are crucial for assessing radiation exposure in contaminated forest ecosystems.
Area of Science:
- Environmental Science
- Radiation Physics
- Forest Ecology
Background:
- Radioactive contamination in forests poses risks to ecosystems and human health.
- Accurate assessment of external radiation dose rates is essential for radiation protection.
- Forest environments significantly alter radiation fields due to biomass and soil interactions.
Purpose of the Study:
- To evaluate the air kerma rate in radioactively contaminated forests.
- To quantify the impact of forest biomass on radiation dose rates.
- To develop practical tools for assessing radiation exposure in forest ecosystems.
Main Methods:
- Numerical solution of the transport (Boltzmann) equation for photon transport.
- Modeling radionuclide sources in soil and forest biomass (trunks, crowns).
- Development of approximation formulae for practical dose rate calculations.
Main Results:
- Forest biomass reduces air kerma rate by up to 15-20% at 1m above soil for specific source depths and biomass densities.
- The effect of forest biomass on dose rate is less dependent on photon energy than on source depth and biomass distribution.
- Weathering processes significantly influence the dynamics of air kerma rate after radioactive fallout.
Conclusions:
- Forest biomass acts as a significant attenuating and scattering medium for gamma radiation.
- Approximation formulae provide practical tools for estimating dose rates in forest ecosystems.
- Understanding radiation transport in forests is critical for accurate environmental radiation monitoring and risk assessment.
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