On welds that have been repaired, X-rays of the repaired area are usually made from the outside of the pipe. Here, technicians fasten a radioisotope container atop the pipe. The radiographic film is placed on the opposite side of the pipe, also on the outside., 1976-07, PCA0002-2a-20, Folder: PCA0002-2a. Alyeska Pipeline Service Company : Trans-Alaska Pipeline Construction Collection, 1976-1977, PCA 2. Alaska State Library - Historical Collections Finding Aids. https://alaska.libraryhost.com/repositories/2/archival_objects/17439 Accessed February 22, 2025.