There are several good web pages on Whole Body Counting and phantoms, including BMRD-HML, PNNL, and LANL. I invite all of you to look at the most recent addition: http://www.llnl.gov/wbc/ These pages have some good pictures of different styles of counting systems and phantoms. David P. Hickman, Ph.D. Lawrence Livermore National Laboratory dhickman@llnl.gov