IRRADIATING ELONGATED MATERIAL

摘要

A plurality of conductors covered with crosslinkable insulation are advanced past an accelerator window with the stringup of each being accomplished to present a number of passes of each conductor to the accelerator beam and to cause uniform dosing of the insulation. A shutter associated with each conductor and spanning all the passes thereof is mounted for movement between the associated conductor and the accelerator to shield the conductor from the beam. When the supply of one of the conductors is about to be exhausted and requires a splice to a new supply, the line speed of that conductor is decelerated while the associated shutter is interposed between that conductor and the beam in synchronization with the line speed relative to dosimetry data to provide a constant dose exposure per pass during the splicing. The movement of the shutter is similarly coordinated with the acceleration of the conductor to line speed following the splicing operation.