The linear attenuation coefficient in lead for ^99mTc gamma rays (140 keV) is 23 cm^-1. What percentage of these gamma rays will be absorbed by a lead apron that contains 0.60 mm of lead?

Question

Quizplus · Accepted Answer

The intensity of the transmitted radiation is given by: I = I₀e^- ^$\mu$ ^x where $\mu$is the linear attenuation coefficient, or the fraction of the beam absorbed in some (very small) thickness x. The linear attenuation coefficient $\mu$ is the analog of the decay constant $\lambda$ in radioactive decay. The linear attenuation coefficient $\mu$ depends on the type of absorbing material and the energy of the photons.

The Linear Attenuation Coefficient in Lead for 99mTc Gamma Rays

The Linear Attenuation Coefficient in Lead for ^99mTc Gamma Rays