On the significance of very small angle scattered radiation to radiographic imaging at low energies

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Abstract
The angular distribution of scattered radiation at low energies for angles between 2.degree. and 15.degree. from the outward normal to the exit surface of several phantoms, with 1.degree. resolution, was examined. A cryogenically cooled Ge detector was used to measure the spectra of the scattered radiation. The differential scattering fluences, or numbers of photons per unit solid angle per unit surface area, exhibit distinct peaks at angles in the vicinity of 5.degree., with the angular position being only slightly energy dependent but very material dependent. The scattered spectra show large changes as a function of angle, in some cases actually becominng harder than the exit unscattered beam. The significance of this behavior relative to the imaging of targets in mammography examinations is discussed.
Funding Information
  • Bureau of Radiological Health (223-80-6013)

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