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spectral mass attenuation coefficient
quotient of the spectral linear attenuation coefficient, 
Note 1 to entry: The spectral mass attenuation coefficient is expressed in square metre per kilogram (m2·kg−1).
Note 2 to entry: This entry was numbered 845-04-79 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-1223 in CIE S 017:2011.