actinometry
光量測定
ac·ti·nom·e·try /-ˈnɑmətrɪ/ 名詞
感光測定法,光化線強度測定法
Ac·ti·nom·e·try n.
1. The measurement of the force of solar radiation.
2. The measurement of the chemical or actinic energy of light.
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actinometry
n : measuring the intensity of electromagnetic radiation
(especially of the sun's rays)