A system development method by Jackson M.A PDF

By Jackson M.A

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Equilibrium half value layer The greatest thickness of materials required to reduce the intensity of a polychromatic beam of radiation by a factor of two. Exposure chart A chart on which is plotted one or more curves which indicate exposures for specified source or X-ray tube, product, film, film density and source to film distance for various product thicknesses. Exposure latitude The ability of a film to accommodate variations in density occurring as a result of differences in thickness of the test object.

Half value thickness The thickness of an absorber that will reduce the intensity of ionising radiation to one half of its incident value half-life The time required for the activity of a radio-nuclide to be halved. Half-wave rectification Rectification which allows current to flow only during alternate half cycles of an alternating supply Hard radiation Radiation of relatively high penetrating power. Hardener A substance used to harden the gelatine in the emulsion on a radiographic film during fixing.

Becquerel The unit of activity of a radioisotope. An isotope has an activity of one (1) becquerel if one (1) atom is decaying each second. Its unit symbol is Bq. Betatron PDF wurde mit FinePrint pdfFactory Pro-Prufversion erstellt. de A toroidal device in which electrons are accelerated using electromagnets to generate high energy X-rays. Cassette A light-tight container for holding a radiographic film during exposure. Cathode The negatively charged electrode of an X-ray tube carrying the filament and focusing cup and from which electrons are discharged towards the target contained in the anode electrode.

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A system development method by Jackson M.A


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