Modeling gamma absorbed dose due to meandering plumes

Area of Science:

• Atmospheric Science
• Radiological Physics

Background:

• Gaussian plume models are standard for atmospheric dispersion.
• Wind direction variability, especially under stable, low-wind conditions, complicates dose rate predictions.
• Gifford's fluctuating plume model provides a basis for addressing temporal variations.

Purpose of the Study:

• To develop a theoretical framework for predicting average gamma absorbed dose rates from meandering Gaussian plumes.
• To compare the new theoretical approach with traditional methods using average concentration distributions.

Main Methods:

• Development of a theory based on Gifford's fluctuating Gaussian plume model.
• Incorporation of plume meandering due to wind direction variations caused by large-scale eddies.
• Comparison of theoretical calculations with traditional approaches.

Main Results:

• A theory was established to predict average gamma absorbed dose rates considering plume meandering.
• The developed theory provides an alternative to traditional methods based on time-averaged concentrations.
• Approximate calculations demonstrated the application of the new theory.

Conclusions:

• The new theory offers a more refined prediction of gamma absorbed dose rates in specific atmospheric conditions.
• Accounting for plume meandering improves the accuracy of dose rate estimations.
• This approach is particularly relevant for scenarios with stable, low-wind conditions.