ORDELA, Inc. cordially invites you to attend the PERALSŪ Workshop XX at the Seattle BAER 2000 conference on Sunday, November 12th from 9:00 am to 10:30 am. Current PERALSŪ users are invited to contact ORDELA and present a short summary of their recent PERALSŪ work. Other topics will include recent work-in-progress on analysis of radionuclides in soils, polonium in lead and solders and effects of different extractive scintillators on pulse height energy resolution and peak position. After the presentation of new items, a brief description of solvent extraction, extractive scintillator chemistry and the PERALSŪ instrument will be given. Attendees, if they notify ORDELA before the meeting at www.ordela.com , will be given a current publications availability list of recently published papers dealing with the PERALSŪ and other useful information.