TERMIUM Plus®

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PHOTOTIMER [1 record]

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Alphabetical list of terms

Record 1 1987-12-09

English

Subject field(s)
  • Radiography (Medicine)
CONT

Phototimers contain a fluorescent material which emits light when exposed to the x-ray beam. The light is directed toward a photocathode which emits electrons when struck by light. The number of electrons emitted is proportional to the brightness of the light which in turn is proportional to the x-ray intensity striking the fluorescent screen. This flow of electrons is amplified in a photomultiplier and ... automatically terminates the exposure when a predetermined exposure has been reached.

French

Domaine(s)
  • Radiographie (Médecine)
DEF

Dispositif de détermination et de commande automatique du temps de pose en radiographie.

OBS

Termes et définition tirés de la norme NF-C74-100, 1972.

Spanish

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