%0 Journal Article
%A William J Fisk
%A Richard J Prill
%A John D Wooley
%A William J Fisk
%A Yves C Bonnefous
%A Ashok J Gadgil
%A William J Riley
%B Health Physics
%D 1995
%G eng
%N 5
%P 689-698
%T New Methods of Energy Efficient  Radon Mitigation
%V 68
%1 <p>2.4</p>
%2 LBL-36519
%8 05/1995
%X <p>Two new radon mitigation techniques are introduced and their evaluation in a field study complemented by numerical model predictions is described. Based on numerical predictions, installation of a sub gravel membrane at the study site resulted in a factor of 2 reduction in indoor radon concentrations. Experimental data indicated that installation of "short-circuit" pipes extending between the subslab gravel and outdoors caused an additional factor of 2 decrease in the radon concentration. Consequently, the combination of these two passive radon mitigation features, called the membrane and short-circuit (MASC) technique, was associated with a factor of 4 reduction in indoor radon concentration. The energy-efficient active radon mitigation method, called efficient active subslab pressurization (EASP), required only 20% of the fan energy of conventional active subslab depressurization and reduced the indoor radon concentration by approximately a factor of 15, including the numerically-predicted impact of the sub-gravel membrane.</p>