IEVref: | 881-04-27 | ID: | |

Language: | en | Status: Standard | |

Term: | mass attenuation coefficient | ||

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Symbol: | $\frac{\mu}{\rho}$ | ||

Definition: | 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$\frac{\mu}{\rho}=\frac{1}{\rho N}\frac{\text{d}N}{\text{d}l}$ NOTE – The mass attenuation coefficient $\frac{\mu}{\rho}$ for X-radiation and gamma-radiation may be expressed as the sum of several parts, each attributed to a particular phenomenon; $\frac{\tau}{\rho}$ for the photoelectric effect; $\frac{{\sigma}_{c}}{\rho}$ for the Compton effect; $\frac{{\sigma}_{\text{coh}}}{\rho}$ for coherent scattering; and $\frac{\kappa}{\rho}$ for pair production. | ||

Publication date: | 1983-01 | ||

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$\frac{\mu}{\rho}=\frac{1}{\rho N}\frac{\text{d}N}{\text{d}l}$