"Figure 2 from ""Effective gamma-ray sterilization and characterization of conductive polypyrrole biomaterials"": (a) Atomic force micrographs of PPy and γ-PPy samples irradiated with different doses of gamma-ray. (b) Average roughness (root mean square) of PPy and γ-PPy samples. NanoWorld Pointprobe NCHR AFM probes were used for the imaging."