“…However, it is difficult to make highly concentrated and stable (long preservation time) silver nanoparticles suitable for real applications. The radiation technique has proven to be a convenient method to prepare size-controllable metal nanoparticles (Sarkany et al, 2005;Shin et al, 2004;Yu et al, 2004;Kang et al, 2006;Liu et al, 2007;Oh et al, 2006), because hydrated electrons generated from water radiolysis are strong reduction species.…”