Investigation of Radon Entry and Effectiveness of Mitigation Measures in Seven Houses in New Jersey.

摘要

This report describes the results from a year-long, intensive, instrumented study of radon entry processes and the effectiveness of radon mitigation measures in seven occupied New Jersey houses. All of the houses that were studied are basement houses that had elevated radon levels (i.e., greater than 400 and less than 7500 Bq m(sup (minus)3)) prior to the study. Various mitigation strategies were evaluated in the houses. The most successful strategy was depressurization of the soil beneath the concrete slab of the basement. To achieve subslab depressurization, one or more slab penetration points were selected for each house. The most important diagnostic measurement in selection of effective slab penetration points was testing of air flows between potential penetrations and points on the slab perimeter. Careful sealing of the wall to the slab was found to increase the effective zone of depressurization beneath the slab. 100 figs., 35 tabs.