Determination of Integral Absorbed Dose from Exposure Measurements

Methods of evaluating integral doses administered in roentgen diagnostic s and radiation therapy are analyzed. The calculations are performed by using either centralaxis depth-dose data with a saturated contribution of scattered radiation, or roentgen radiation spectra, and performing necessary corrections for escape energy. The relation between exposure and the incident energy per unit area is calculated for the different spectra by means of energy absorption coefficients for air. Both methods give roughly the same results but disagree with certain published data. (auth)