microdensitometer

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mi·cro·den·si·tom·e·ter

 (mī′krō-dĕn′sĭ-tŏm′ĭ-tər)
n.
An extremely sensitive densitometer used to measure optical densities of photographic plates or film to detect small details, such as spectral lines invisible to the human eye.
References in periodicals archive ?
During the quarter the Company shipped an INTRABEAM system for intra- operative radiation therapy and two Microdensitometers, which are used to provide high-precision characterization relative to the radiation dose surrounding small radiation sources.