of a material for indirectly ionizing particles, the quotient dN/N by ρ dl,where dN/N is the fraction of particles that experience interactions in traversing a distance dl in a medium of density ρ
NOTE – The mass attenuation coefficient for X-radiation and gamma-radiation may be expressed as the sum of several parts, each attributed to a particular phenomenon; for the photoelectric effect; for the Compton effect; for coherent scattering; and for pair production.
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