ASTM E 186 - 98. Standard Reference Radiographs for Heavy-Walled (2 to 41⁄2-in. (51 to 114-mm)) Steel Castings

American Society for Testing and Materials (ASTM). 1998, 3 pages.
These reference radiographs2 for heavy-walled steel castings are applicable to nominal section thicknesses of 2 to 41⁄2 in. (51 to 114 mm) and consists of three separate sets as
follows:
Volume 1: 1–MV X Rays and Iridium 192 (called 1 to 2–Mev X rays in previous editions)-Set of 28 plates (5 by 8 in. (127 by 203 mm) in a 15 by 17 in. (381 by 432 mm) ring binder).
Volume 2: 2–MV X Rays and Cobalt-60 (called gamma rays in previous editions). This includes cobalt-60 or equivalent isotope radiation and from 2–MV up to 4–MV X rays- Set of 28 plates (5 by 8 in.) in a 15 by 17 in. ring binder.
Volume 3: 4–MV to 30–MV X rays (called 10 to 24 Mev X rays in previous editions)- Set of 28 plates (5 by 8 in.) in a 15 by 17 in. ring binder.