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

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
References in periodicals archive ?
In contrast, infections with PARV4 were restricted to those with a history of parenteral exposure (IDUs and patients with hemophilia).
The higher frequency of PARV4 detection in HIV-positive persons may be an indirect reflection of the greater degree of parenteral exposure among IDUs who be come infected with HIV.