exposure

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exposure

 [eks-po´zhur]
1. the act of laying open, as surgical exposure.
2. the condition of being subjected to something, as to infectious agents or extremes of weather or radiation, which may have a harmful effect.
3. in radiology, a measure of the amount of ionizing radiation at the surface of the irradiated object, such as a person's body; calculated by multiplying milliamperage times exposure time in seconds, expressed in units of milliampere seconds (mAs). See also x-rays.
x-ray exposure see exposure (def. 3).

ex·po·sure

(eks-pō'zhūr),
1. A condition of displaying, revealing, exhibiting, or making accessible.
2. In dentistry, loss of hard tooth structure covering the dental pulp due to caries, dental instrumentation, or trauma.
3. Proximity or contact with a source of a disease agent in such a manner that effective transmission of the agent or harmful effects of the agent may occur.
4. The amount of a factor to which a group or individual was exposed; in contrast to the dosage, the amount that enters or interacts with the organism.

exposure

/ex·po·sure/ (eks-po´zher)
1. the act of laying open, as surgical exposure.
2. the condition of being subjected to something, as to infectious agents, extremes of weather, or radiation, which may have a harmful effect.
3. in radiology, a measure of the amount of ionizing radiation at the surface of the irradiated object, e.g., the body.

air exposure  radiation exposure measured in a small mass of air, excluding backscatter from irradiated objects.

exposure

[ikspō′zhər]
Etymology: L, exponere, to lay out
1 a measure of the ionization of air produced by a beam of radiation. It is expressed as coulombs per kilogram of air.
2 a state of being in the presence of or subjected to a force or influence (e.g., viral exposure, heat exposure).
Epidemiology A state of contact or close proximity to a chemical, pathogen, radioisotope or other other substance by ingesting, breathing, or direct contact—e.g., on skin or eyes; exposure may be short term—acute—or long term—chronic

Imaging An image, such as an anteroposterior exposure of the chest
Medical liability The degree of malpractice risk borne by a health care provider while performing a particular medical service
Nuclear physics The amount of ionising radiation in air from X-rays or gamma rays at a specific point in space, defined as the total charge of ions divided by the mass that would completely stop the radiation; the SI unit for exposure is coulomb per kg—C/kg; in human terms, exposure refers to the amount of ionizing radiation to which a person has been subjected

exposure

Epidemiology A state of contact or close proximity to a chemical, pathogen, radioisotope or other other substance by swallowing, breathing, or direct contact–eg, on skin or eyes; exposure may be short term–acute or long term–chronic. See Acute exposure, Athlete exposure, Chronic exposure, Intermediate exposure, Occupational exposure to bloodborne pathogens, Perinatal substance exposure Imaging An image, as an AP exposure of the chest Medical liability A general term for the degree of malpractice risk borne by a health care provider while performing a particular medical service See Risk management.

ex·po·sure

(eks-pō'zhŭr)
1. Contact of a compound with an epithelial barrier such as the skin, eyes, respiratory tract, or gastrointestinal tract before absorption occurs.
See also: exposed dose, external dose
2. Physical effects caused by harsh weather.
3. Placing an object or person in a given environmental state.

exposure

  1. the aspect of a particular location with respect to the points of the compass, for example, some garden plants, such as the peach tree in England, prefer a southern exposure.
  2. a rock outcrop.
  3. a soil section.

ex·po·sure

(eks-pō'zhŭr)
1. In dentistry, loss of hard tooth structure covering the dental pulp due to caries, dental instrumentation, or trauma.
2. A condition of displaying, revealing, exhibiting, or making accessible.
3. Proximity to contact with a source of a disease agent in such a manner that effective transmission of the agent or harmful effects of the agent may occur.

exposure

(ikspō´zhər),
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
(erəthē´mə),
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.

exposure

1. the act of laying open, as surgical exposure.
2. the condition of being subjected to something, as to infectious agents or extremes of weather or radiation, which may have a harmful effect.
3. in radiology, a measure of the amount of ionizing radiation at the surface of the irradiated object, e.g. the body.

exposure button
of an x-ray machine. Usually on a 4 to 5 ft cable so that the operator can stand at a distance away from the primary beam. Combined with a timing device that is preset and controls the exposure time. The button is usually a two-stage mechanism, the first causing preheating of the cathode filament and/or rotating the anode, the second closing the electrical circuit and the creation of the x-ray beam.
exposure chart
a chart set up after a preliminary trial that sets out the best arrangement of exposure factors for a particular set of radiological equipment in order to obtain the best results.
climatic exposure
exposure to the weather without provision of shelter. See hypothermia, hyperthermia.
exposure error
under- or overexposure in radiography causing inferior contrast and detail.
exposure factors
the milliampere-seconds and kilovoltage for radiography of a particular animal. The factors are influenced by the speed of the film to be used, the anode to film distance, the grid to be used and the size of the subject. The exposure factors should be kept constant as far as possible.
exposure latitude
degree of over- or underexposure tolerable in a correctly developed film to still produce an acceptable radiographic image.
provocative exposure
in testing for possible hypersensitivity, the exposure to a suspected offensive agent to see if there is a recurrence of clinical signs.
exposure time
in radiography variable but fastest is best with animals because of the difficulty of holding the animal quite still or of delaying its breathing for any length of time. The milliamperage used should be as high as possible to keep the exposure time short.

Patient discussion about exposure

Q. I feel some effects due to less exposure to sunlight. I heard that UV lighting is effective for depression. I’m living in northwest pacific; the summers are very nice but way to short. I feel some effects due to less exposure to sunlight. I have been told that sun light helps the production of the chemical in the brain that we are deficient of. If true, are there certain types of fixtures and/or bulbs that I should try.

A. Its also called seasonal affective disorder:
http://medical-dictionary.thefreedictionary.com/disorder

(SAD) depression with fatigue, lethargy, oversleeping, overeating, and carbohydrate craving recurring cyclically during specific seasons, most commonly the winter months.

I would about UV. Perhaps you should get a fluorescent light fixture for the area where you spend the most time each day and turn it on.

The web sites that sell the commercial light boxes want several hundred dollars or even more. (Seems like rip off to me.)
The web page at
http://www.ncpamd.com/seasonal.htm

says "studies suggest that regular fluorescent lights will work as well. UV (ultraviolet) light can damage eyes and skin, so it must be filtered out. It is best to buy a commercially built light box to be sure of the exact amount of light and to be sure that there are no isolated "hot spots" which could damage eyes. Many people still prefer full spectrum (minus UV) light because it i

Q. how do i keep my baby as minimal as passable exposed to the out side world threats? like decease and other things

A. It might seem like a caring attitude, but I'm not sure it's neither possible nor absolutely necessary - babies do get sick, usually only mildly and transiently, so trying to prevent all the cases of fever would be quite impossible.

What you can do, is to maintain the regular infant welfare visits, give him or her the necessary vaccinations (one of the most important things you can do for your child), make sure your baby eats well, regarding both the amount and type of foods, and generally keep a good hygiene: make sure to wash hands after you go to the toilet and before you handle your baby, don't expose him or her to other sick infants etc.

However, all this is just a general advice - if you have specific question you may want to consult your doctor (e.g. a pediatrician).

Take care,

More discussions about exposure