The present invention provides a process for sanitizing an object. The rib is disposed at a forward end of the tray for supporting a forward end of the holding member when the tray moves forward to the drawn position and the holding member moves to the usable position, and is situated in a space formed in the holding member when the holding member is at the non-usable position. The needle assembly includes a needle, a needle hub, and a needle seal. In some embodiments, the substrate may have a predetermined doping profile, such as a graded doping profile, that provides a built-in electric field suitable to guide the flow of photogenerated minority carriers towards the front side. The second protruding arm presents a physical barrier to the tang to limit the stroke of the actuator arm.