Combined X-Ray/Beta Sensor Advances Nuclear Gauging Technology

A combination sensor utilizing two isotopes, one of which emits low-energy X-rays and the other mid-energy beta particles, has been developed to gauge foil laminates and magnetic films (floppy disks, tapes, etc.). The measurement technique takes advantage of the preferential X-ray absorption of metallic coatings and provides automatic compensation for substrate thickness variation. The sensor is designed for on-line monitoring and functions under microprocessor control.