Definition: | fraction of a parallel beam of specified radiation removed by attenuation in passing through a thin layer of thickness Δx of a substance divided by this thickness
Note 1 to entry: The attenuation coefficient is primarily energy dependent. Note 2 to entry: Depending on whether Δx is expressed in terms of length, mass per unit area, amount of substance or atoms per unit area, μ is called the linear, mass, molar, or atomic attenuation coefficient. Note 3 to entry: This entry was numbered 393-14-41 in IEC 60050-393:2003.
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