Characteristic X-ray frequencies from atoms due to the excitation of electrons from the L-shell. Denoted by La, L [i, ...; the lines are multiplets.
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The electron shell in an atom corresponding to a principal quantum number of two. The shell can contain up to eight electrons. See panel on Atomic structure.
Property of an injection moulding screw or extrusion screw, defined by ratio of screw length to flight diameter. It is typically 20-30 to 1 for thermoplastics and 5-10 to 1 for rubbers. See extrusion,
Class II histocompatibility antigens with functions similar to human HLA-D antigens on mouse B- cells. macrophages and accessory cells.
Small belt conveyor on which ore is so displayed that radioactive pieces are removed as they pass a Geiger-Miiller counter.