Fig. 7 displays images of Cd phantoms (cross and a disk with 1 mm holes)
and ASTM standards (shown in Fig. 6) obtained with two of the tested samples described in Table
1. Image on the top was acquired with a gadolinium oxide converter (the structure was deposited on Al with 5 lm of
Gd2O3 bottom layer 35 lm of CsI(Tl)
and 5 lm of Gd2O3 top layer) and the image on the bottom was acquired with a gadolinium fluoride converter (the sensor had 7 lm of GdF3, 25 lm of CsI(Tl) and a top layer of GdF3 5 lm thick).
The top image displays higher contrast due to the higher concentration of Gd in the converter layers.