Dear RADSAFErs, Happy New Year! Do any of you have experience in using Annular Kinetic Impactor? I believe they are manufactured Staplex and Hi-Q Environmental. I would like to know how effective the impactor is in separating radon and thoron from plutonium and other alpha emitters. Thank you in advance. Tosh Ushino San Onofre Nuclear Generating Station ushinot@songs.sce.com