radiolucence

radiolucence (rā´dēōloo´sens),

n relative term indicating the comparatively low attenuation of a radiographic beam produced by materials of relatively low atomic number. The image on a radiograph of such materials is relatively dark because of the greater amount of radiation that penetrates to reach the film.
References in periodicals archive ?
Radiograph in dogs with nasal aspergillosis may show generalized radiolucence of nasal cavity secondary to turbinate tissue destruction.