Photoabsorption or photoelectric absorption is the dominant interaction mechanism in the s "Italic text" lose to inner shell electron binding energies where there are abrupt changes in interaction probability, so called absorption edges.
Photoabsorption or photoelectric absorption is the dominant interaction mechanism in the soft X-ray regime and for the lower hard X-ray energies. This rule is not valid close to inner shell electron binding energies where there are abrupt changes in interaction probability, so called absorption edges.