Photon interactions with soft tissue

Linear attenuation coefficient [cm-1]

Scattering (total)

Photoelectric

Scattering (absorption)

• sphotoelectric is larger

than sscattering below 25 keV

• e- Range (150 keV) ? 300 mm

Dose to the patient

sphotoelectric ? Z4/E3

Energy [KeV]

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