Two‐dimensional X‐ray diffraction patterns may be recorded quantitatively by means of X‐ray‐to‐electron converters which are scanned in a television‐type raster scan. Detectors of this type are capable of operating over the whole range of counting rates from very low to higher than those with which other types of converters can deal. The component parts of an X‐ray television detector are examined and the limits to the precision of the measurements