According to Saint-Gobain the density of LYSO is 7.1 g/cc for 10% Yttrium material and 7.25 g/cc for 5% Yttrium material. Ray Raylman Raymond R. Raylman, Ph.D. Associate Professor/Vice Chair for Research Dept of Radiology/Box 9236 West Virginia University Morgantown, WV, 26506 Phone: 304-293-1973oe