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Xeroradiography is a type of X-ray imaging in which a picture of the body is recorded on paper rather than on film. In this technique, a plate of selenium, which rests on a thin layer of aluminium oxide, is charged uniformly by passing it in front of a scorotron.[1] The process was developed by engineer Dr. Robert C. McMaster in 1950.[2]

Medical diagnostics

As X-ray photon impinges on this amorphous coat of selenium, charges diffuse out, in proportion to energy content of the X-ray. This occurs as a result of photoconduction. The resulting imprint, in the form of charge distribution on the plate, attracts toner particles, which is then transferred to reusable paper plates. In contrast to conventional X-rays, photographic developers are not needed. Hence the term xeroradiography; 'xero' meaning dry in Greek. It requires more radiation exposure. Historically used in mammography prior to the advent of digital mammography.

Xeromammography is a form of xeroradiography.[3]


  1. ^ "Scorotron". Medcyclopaedia. GE.
  2. ^ Berger, Harold (1986). "Robert C. McMaster — a personal remembrance". NDT International. 19 (5): 356. doi:10.1016/0308-9126(86)90020-9.
  3. ^ Xeromammography at the US National Library of Medicine Medical Subject Headings (MeSH)

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  This article incorporates public domain material from the U.S. National Cancer Institute document "Dictionary of Cancer Terms".

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