Introduction to Radon & Health Risk
The Fundamentals of Radon & Radioactivity
Radon Occurrence & Behavior
Radon Measurement & Devices
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Chapter 3 Overview

This chapter provides basic information on the ways in which radon enters a home and how the indoor and outdoor environments affect its behavior.

Chapter Outline

  • Chapter 3: Entry and Behavior of Radon in Indoor Air
    • How Radon Gets Indoors
    • Radon Sources
      • Radon from Radium in Soils and Bedrock
      • Building Materials
      • Water
    • Radon Transport Mechanisms
      • Aquifer & Well Water
      • Concentration Gradient Diffusion (rock & soil)
      • Emanation from Building Materials
      • Pressure Driven Airflow
    • Radon Pathways
      • Foundations
      • Other Pathways
    • Factors Affecting Indoor Radon Levels
      • Dynamic Equilibrium
      • Diurnal Cycles
      • Seasonal Variations

Chapter Learning Objectives

  • Identify the primary routes of radon entry into a building
  • Identify (4) mechanisms that transport radon into a building
  • Identify (3) ways in which Pressure Driven Airflow draws radon into a building
  • Define the concept of stack effect
  • Define the concept of neutral pressure plane.  List negative pressure sources (thermal bypasses) in a building
  • Explain how a spike in radon levels inside the home can occur
  • List six pathways for pressure driven transport
  • Identify the five common foundations common in the US and define which are pathways for pressure driven airflow
  • Explain how daily and seasonal variations effect radon concentrations.
  • Describe the effect of ventilation on indoor radon concentrations.
  • Identify the EPA Guideline for radon in water
  • Identify the primary contribution to indoor air caused by radon in water
  • Identify the primary sources of radon in water.
  • Identify the primary contribution to a radon in air problem due to radon in water.
  • List the typical water sampling methods.
  • Identify the two methods of analyzing collected water samples.
  • Name at least one pro and one con for each water sampling method.
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