Modelling radon progeny concentration variations in thermal spas.

Area of Science:

• Environmental Science
• Radiological Health
• Atmospheric Physics

Background:

• Radon and its short-lived progenies are significant indoor radioactive pollutants.
• Thermal spa users face considerable radiation exposure from these pollutants.
• Accurate monitoring of progeny concentration is vital for short-term dose estimations.

Purpose of the Study:

• To develop a prediction model for short-lived radon progeny concentration variations.
• To apply this model to published data from thermal spas on Lesvos Island.
• To estimate key physical parameters like attachment and deposition rates.

Main Methods:

• Modeled physical processes using differential equations based on radon measurements.
• Applied the model to existing data from thermal spas.
• Fitted published daughter data to model predictions, adjusting unknown parameters.

Main Results:

• Estimated attachment rate constants between 50 and 200 h⁻¹.
• Estimated deposition rate constants for attached progenies (0.25–5 h⁻¹) and unattached progenies (0.5–170 h⁻¹).
• Determined time shifts for unattached and attached progenies relative to radon.

Conclusions:

• The developed model effectively predicts radon progeny concentration variations.
• The study provides valuable insights into the behavior of radon progeny in thermal spa environments.
• Estimated parameters are crucial for refining radiation dose assessments in such settings.