2022 International Radon and Vapor Intrusion Symposium

OUTDOOR RADON LEVELS INFLUENCE ON
INDOOR RADON LEVELS
Bill Brodhead
WPB Enterprises, Inc.,
2844 Slifer Valley Rd., Riegelsville, PA 18017
wmbrodhead@gmail.com www.wpb-radon.com
Abstract

The Indoor Radon Abatement Act was signed in 1988 with the goal of reducing indoor radon levels to the radon levels outdoors.  Radon mitigation methods have been employed nationwide since that time to reduce, but not eliminate, indoor radon levels.  Meeting the goal set in 1988 has not been practiced by the industry primarily because it required making radon measurements indoors and eliminating any direct soil gas entry into the residence.  In this study the reduction of indoor radon levels were maximized to the point where outdoor radon levels became the primary source.  The data provided in this study is an attempt to determine the influence of outdoor radon levels on indoor radon levels at a single residence. The data include radon levels outdoors and on three levels of the home indoors measured over several months in 2022.  The methods used to eliminate the pathways of soil gas into the residence are also included.