Abstract: A method of constructing a low crosstalk faceplate for a multiple section photomultiplier tube is disclosed. To prevent scatter of incident radiation into adjacent sections, a glass barrier which absorbs the incident radiation is formed within the faceplate around each clear glass section and across the entire thickness of the faceplate. The construction method involves the use of a glass whose transmission characteristic can be varied by exposure to ultraviolet radiation. Thus, the faceplate is constructed of the U.V. sensitive glass, specific areas are masked, and then the glass is exposed to the required radiation and a following heat treatment. The boundary regions around each photocathode are thereby converted to opaque glass.