THE INFLUENCE OF PINHOLES IN WATERPROOFING MATERIALS ON THE VALUE OF THE RADON DIFFUSION COEFFICIENT

Area of Science:

• Environmental Science
• Materials Science
• Nuclear Engineering

Background:

• Waterproofing materials are essential for building integrity.
• Radon gas intrusion poses a health risk.
• Understanding radon diffusion is key to effective mitigation.

Purpose of the Study:

• To experimentally investigate the impact of simulated construction damage (pinholes) on the radon diffusion coefficient of waterproofing materials.
• To quantify how the number and size of imperfections affect radon permeability.
• To provide data for selecting and evaluating waterproofing materials in radon-prone environments.

Main Methods:

• Simulated microscopic holes (pinholes) were created in various waterproofing materials.
• Radon diffusion coefficients were measured five times per material: initially and after introducing 1, 2, 4, and 8 pinholes.
• Measurements were conducted under non-stationary conditions using homemade radon sources.
• Electron microscopy was used to document the precise dimensions of the imperfections.

Main Results:

• The presence and number of pinholes demonstrably altered the radon diffusion coefficient.
• Larger and more numerous pinholes led to a significant increase in radon diffusion.
• Material thickness also influenced the radon diffusion coefficient, interacting with the effect of pinholes.

Conclusions:

• Simulated damage significantly compromises the radon-blocking efficacy of waterproofing materials.
• The study highlights the critical need to consider material imperfections in radon risk assessments.
• Findings inform material selection and quality control for enhanced radon protection in buildings.