Radiant exposure

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What Wikipedia says

In radiometry, radiant exposure or fluence is the radiant energy received by a surface per unit area, or equivalently the irradiance of a surface, integrated over time of irradiation, and spectral exposure is the radiant exposure per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength.

Excerpt from the Wikipedia article “Radiant exposure”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: United States Nuclear Regulatory Commission, Public domain, via Wikimedia Commons.