RADIUM-226 AND. RADON-222 REMEDIAL ACTION GUIDES (ABove BackGrounD) RADIONUCLIDE GUIDE RaDON-222 >0.03 REauirReD ACTION <0.02 No AcTION >3pC1/1 REauirReD ACTION +DAUGHTERS RaDON-222 . ACTION STRUCTURES BouNDARY OF CONTROLLED PROPERTY >30PeC1/1 REQUIRED ACTION Over SURFACE OF CONTROLLED PROPERTY RADI UM-226 >15eC1/c REqurrReD ACTION 19 cm or Less SOIL THICKNESS >5pC1/1 RequiReD ACTION SURFACE WATER oR GROUND WATER Gamma Dose >0.02 mMREM/HR REQUIRED ACTION EXTERNAL RADIATION