ˈ ̷ ̷| ̷ ̷ ̷ ̷ noun
or backscattering ˈ ̷ ̷| ̷ ̷ ̷ ̷ ̷ ̷
Etymology: back (II) + scatter or scattering
: the scattering of radiation (as X rays) in a direction approximately opposite to that of the incident radiation and due to reflection from particles of the medium traversed ; also : the radiation so reversed in direction