Question

Soft tissue has a linear attenuation coefficient in the range of ? = 0.35 cm?1 at 30 keV and ? = 0.16 cm?1 at 100 keV. For this problem we use ? = 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, that is, neglecting bones. N N0 = (b) We compare bone and soft tissue of 3 cm thickness each. Using ?bone = 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? bone N N0 = soft tissue N N0

Answer 1