Figure 194

Comparison of X-radiography (left) and gamma radiography (right) of a monumental bronze finger—a fragment of the monumental statue of Emperor Constantin held at the Capitoline Museum. The polygonal patch repairs are highlighted in red. The operating conditions for gamma radiography were: ~2 mm ¹⁹²Ir 30Ci (1,1 TBq) source, 1 m source/object distance, 20 min. exposure, ERLM Dürr NDT H CR plate (resolution 50 µm), 0.1 mm Pb filtering before and after detector. Monumental bronze finger, Rome, ca. 330 CE, H. 38 cm (Musée du Louvre, inv. Br78). See fig. 172 for an overall view. See Azéma, Descamps-Lequime, and Mille 2018.