A polychromatic X-ray beam has the energy spectrum in Figure P. Which option depicts the energy spectrum after passing through a human body? In every graph the horizontal axis is energy in keV and the vertical axis is relative X-ray intensity.
Low-energy photons are preferentially absorbed, reducing intensity and increasing the mean energy of the transmitted spectrum: beam hardening. The upper energy endpoint remains fixed by the source voltage. B suppresses the low-energy part while retaining the high-energy extent and characteristic lines. C and D instead truncate the high-energy end.
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