Scattered radiation in a water phantom irradiated by roentgen photons between 50 and 250 keV

n g e r and K u r t L i d k nMultiple scattering occurs when roentgen photons of therapeutic or diagnostic quality enter a low atomic medium such as water so that, a t a given point, secondary or scattered photons in addition to the primary photons from the radiation source are present.This increase in the number of photons within the scattering medium is called the 'build-up'.