Figure 4: Energy-specific neutron transmission images allowing mapping of the elemental distributions.

(a) Transmission image obtained at the energies of gold resonance of spectral region A. (b) Transmission measured at energies B with no resonances present for these samples. (c) Image (a) normalized by image (b), emphasizing contribution of gold only. (d) Image measured at the Pd resonance energy (spectral region C) normalized by an off-resonance region B, emphasizing the distribution of Pd within the samples. No Pd is detected in samples N1 and N4.