An image processing method includes decoding encoded image data to generate a decoded image signal including a luma signal and a chroma signal. The radiation shielding material comprises a rubber component and a radiation attenuating metal in amounts effective to obtain a desired balance of flexibility and radiation attenuation, respectively. The stapling unit has a stapling magazine in which staple blanks are stored. Argon gas is used to provide the inert atmosphere and also applied to cool and condense the silver vapor into a silver nano powder to obtain a silver nano particle.