entrance exposure

entrance exposure,

the skin dose of radiation as the beam enters the patient. It may be expressed in milliroentgens or C/kg.

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exposure

(ikspō´zhr),
n uncovering: subjection to viewing or radiation.

exposure, accidental pulp,

n a pulp exposure unintentionally created during instrumentation.

exposure, air,

n the radiation exposure measured in a small mass of air under conditions of electronic equilibrium with the surrounding air, i.e., excluding backscatter from irradiated parts or objects.

exposure, cariogenic

(karēōjen´ik),
n an incident in which teeth come into contact with foods that tend to create a favorable environment for development of dental caries.

exposure, carious pulp,

n a pulp exposure occasioned by extension of the carious process to the pulp chamber wall.

exposure, chronic,

n a radiation exposure of long duration, either continuous (protraction exposure) or intermittent (fractionation exposure); usually referring to exposure of relatively low intensity.

exposure, cumulative,

n the total accumulated exposure resulting from repeated radiation exposures of the whole body or of a particular region.

exposure, double,

n the two superimposed exposures on the same radiographic or photographic film.

exposure, entrance,

n an exposure measured at the surface of an irradiated body, part, or object. It includes both primary radiation and backscatter from the irradiated underlying tissue or material.

exposure, erythema

(erthē´m),
n the radiation exposure necessary to produce a temporary redness of the skin. The exposure required varies with the quality of the radiation to which the skin is exposed.

exposure incident,

n an event in which a health care professional's potential for infection is heightened after coming into contact with a patient's blood, body fluids, mucous membranes, or broken skin.

exposure, mechanical pulp,

n See exposure, pulp, surgical.

exposure, parenteral,

n exposure of the internal systems of the body due to the puncturing of the skin by a needle or other sharp instrument.

exposure, protraction,

n the continuous exposure to radiation over a relatively long period at a low exposure rate.

exposure, pulp,

n an opening through the wall of the pulp chamber uncovering the dental pulp.

exposure, radiographic,

n a measure of the x or g radiation to which a person or object, or part of either, is exposed at a certain place, this measure being based on its ability to produce ionization. The unit of x- or g-radiation exposure is the roentgen (R).

exposure, radiographic, entrance (surface),

n the radiation exposure measured at the external surface of a person or thing that has been ir-radiated. Measurement includes both backscatter radiation from the exposed tissues and primary radia-tion.

exposure rate, output,

n the exposure to radiation at a specified point per unit of time, usually expressed in roentgens per minute.

exposure, surface,

n See exposure, entrance.

exposure, surgical pulp,

n (mechanical pulp exposure) the pulp exposure created intentionally or unintentionally during instrumentation.

exposure, threshold,

n the minimum exposure that will produce a detectable degree of any given effect.

exposure time,

n the time during which a person or object is exposed to radiation, expressed in one of the conventional units of time.