Off-line supercritical fluid extraction (SFE) followed by γ-radiolysis as an alternative treatment technique for PCB-contaminated soil was investigated in this study using BZ #54 (2,2',6,6'-tetrachlorobiphenyl) as the model compound. The preliminary results indicate that removal of BZ #54 from spiked sand and soil using SFE at 150 o C and 20 MPa is 98% and 93%, respectively. The reduction efficiency of 864 mg/l BZ #54 in isooctane by γ-radiolysis is 99.8% at an absorbed dose of 500 kGy.