ac·ti·nom·e·ter /ˌæktəˈnɑmətɚ/
  光化線計,感光計,測光表
  ac·ti·nom·e·ter /ˌæktəˈnɑmətɚ/ 名詞
  曝光表,光化線強度計,化學光度計
  Ac·ti·nom·e·ter n.  (a) An instrument for measuring the direct heating power of the sun's rays. (b) An instrument for measuring the actinic effect of rays of light.
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  actinometer
       n : an instrument for measuring the intensity of electromagnetic
           radiation (usually by the photochemical effect)