physics

posted by mar

Soft tissue has a linear attenuation coefficient in the range of
μ = 0.35 cm−1
at 30 keV and
μ = 0.16 cm−1
at 100 keV. For this problem we use
μ = 0.21 cm−1,
which applies at around 50 keV incident X-ray energy.
(a) What fraction of X-ray photons at 50 keV are passing through a person's body? Hint: the person's body thickness is about 19 cm. Use a soft tissue approximation, i.e., neglecting bones.
(b) We compare bone and soft tissue of 4 cm thickness each. Using
μbone = 0.57 cm−1
at 50 keV, what fraction of a 50 keV incident X-ray beam is stopped in bone and soft tissue respectively?

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