Harshaw Chemical is now Harshaw Bicron NE. The number is 800-472-5656. The best person to talk to on old Harshaw parts is Ross Stanway at 216.349.6960 ext 6568. He has been a great help with our systems. Roger Moroney Technical Director - External Dosimetry Program Radiation Specialist Mallinckrodt wrmoroe@mkg.com 314.654.7457 voice 314.654.7998 fax