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Linear Attenuation Coefficients. Monochromatic photons are attenuated exponentially in a uniform target. The number of photons in a pencil beam interact within a small distance dx is. dN = -μ Ndx. where μ is the linear attenuation coefficient and the solution to the above differential equation is.
The linear attenuation coefficient increases as the atomic number of the absorber increases. The mass attenuation coefficient is defined as the ratio of the linear attenuation coefficient and absorber density (μ/ρ).
The linear attenuation coefficient, attenuation coefficient, or narrow-beam attenuation coefficient characterizes how easily a volume of material can be penetrated by a beam of light, sound, particles, or other energy or matter. [1]
Linear attenuation coefficient (µ) is a constant that describes the fraction of attenuated incident photons in a monoenergetic beam per unit thickness of a material 1. It includes all possible interactions including coherent scatter, Compton scatter and photoelectric effect 1.
Linear Attenuation Coefficients. Linear attenuation coefficient is measured using the following setup. Using small detector to avoid the effect of Compton scattered photons on the measured linear attenuation coefficient.
Units for the linear attenuation coefficient are typically expressed in cm^-1, indicating how many units of thickness are required to reduce the intensity of radiation by a factor of e (approximately 2.718).
Attenuation Coefficients Linear attenuation coefficient µ: The probability of an interaction per unit distance traveled. µ has the dimensions of inverse length (eg. cm-1). N =N e−µx 0 The coefficient µ depends on photon energy and on the material being traversed. Radiation Interactions: photons Page 9 of 13
