Scanning Method and Apparatus

摘要

Abstract The invention discloses a scanning method and apparatus suitable for scanning a pipeline or process vessel in which a beam of gamma radiation from a source is emitted through the vessel to be detected by an array of detectors which are each collimated to detect radiation 5 over a narrow angle relative to the width of the emitted radiation beam. Figure 1 Figure 1A + t 4 d A -- + 12'-h Figure 1B 4 d Figure 2 .../. . . . I- . . . . . ..___ __ __