irradiation


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Related to irradiation: gamma irradiation, Blood Irradiation

irradiation

 [ĭ-ra″de-a´shun]
2. the dispersion of nervous impulse beyond the normal path of conduction.
3. the exposure of a substance to radiation, which consists of any of numerous kinds of rays that travel at the speed of light. Every living thing is subject to some irradiation by cosmic rays, ultraviolet rays in sunlight, and other natural radiation in the environment, all of which is usually slight and harmless. In large amounts, however, certain kinds of radiation cause direct harm to living cells, especially those rays that have a greater frequency and produce more energy. Irradiation of certain foods, including milk, kills harmful bacteria, prevents spoilage, and sometimes increases its vitamin efficiency. X-ray photography is used in industrial research and in diagnosis of disorders within the body.

Radiation therapy usually refers to treatment by x-rays and gamma rays. X-rays are produced by bombarding a tungsten target with high-speed electrons in a vacuum tube; gamma rays are emitted during the decay of radioisotopes. X-rays may be employed to kill organisms causing skin diseases, for example, or to destroy the abnormal cells that form tumors. Gonads, blood cells, and cancer cells are especially sensitive to radiation, particularly to x-rays and gamma rays.

Other rays are also used medically. Infrared rays produce a radiant heat used for the treatment of sprains and bursitis; tissues such as muscles and joints are relaxed and soothed by the penetration of these rays. Ultraviolet rays are used in sun lamps to treat skin diseases, such as acne and psoriasis. See also discussion of protection against harmful effects of radiation under radiation.
extended field irradiation irradiation of an extended field in radiation therapy for malignant lymphoma.
external beam irradiation radiation therapy in which the radiation is emitted from a source located at a distance from the body.
hemibody irradiation external beam irradiation involving exposure of half the body.
interstitial irradiation see radiation therapy.
involved field irradiation irradiation of only the involved field in radiation therapy for malignant lymphoma.
mantle field irradiation irradiation of a mantle field in radiation therapy for malignant lymphoma.
total body irradiation (whole-body irradiation) TBI; external beam irradiation involving exposure of the entire body.

ir·ra·di·a·tion

(i-rā'dē-ā'shŭn),
1. The subjective enlargement of a bright object seen against a dark background.
See also: radiation.
2. Exposure to the action of electromagnetic radiation (for example, heat, light, x-rays).
See also: radiation.
3. The spreading of nervous impulses from one area in the brain or cord, or from a tract, to another tract.
See also: radiation.
[L. ir-radio, (in-r), pp. -radi-atus, to beam forth]

irradiation

(ĭ-rā′dē-ā′shən)
n.
1. The act of exposing or the condition of being exposed to radiation.
2. The use or application of ionizing radiation, especially in medical treatment and for the sterilization or preservation of food.

irradiation

 
1. Radiation therapy, see there.
2. Blood irradiation, see there.

ir·ra·di·a·tion

(ir-rādē-āshŭn)
1. The subjective enlargement of a bright object seen against a dark background.
2. Exposure to the action of electromagnetic radiation (e.g., heat, light, x-rays).
3. The spreading of nervous impulses from one area in the brain or cord, or from a tract, to another tract.
See also: radiation
4. A process of preparation in which food is exposed to low doses of radiation to decrease bacteria and improve shelf life.
[L. ir-radio,(in-r), pp. -radi-atus, to beam forth]

irradiation

Exposure to any form of ionizing or other radiation either for purposes of treatment, as in radiotherapy, or to sterilize medical or surgical material and instruments.

irradiation

1. Application of electromagnetic radiations to an object. 2. A phenomenon in which a bright area against a black background appears larger than a darker area of equal size against the same background. Syn. Helmholtz illusion.

ir·ra·di·a·tion

(ir-rādē-āshŭn)
1. The subjective enlargement of a bright object seen against a dark background.
2. Exposure to the action of electromagnetic radiation.
[L. ir-radio, (in-r), pp. -radi-atus, to beam forth]
References in periodicals archive ?
Sensitivity to irradiation of PC3 and LNCaP cells was reduced by HULC
A Brown chief said the Philippines would benefit from the project more than his company since fresh fruit exports are expected to increase following the establishment of irradiation center in the country.
There are several vertical test holes for irradiation testing of nuclear fuels and materials.
The selected seeds put in Radiator Gamma Chamber Model 4000A CoA60 for irradiation at a dose of 250 Gy for 36"15' and 500 Gy for 72"30'.
Therefore this study was designed to evaluate the impact of ionizing radiations, including gamma (g) and electron (e) beam, on beef jerky through detection of induced hydrocarbons and develop any possible irradiation markers for determination of irradiated food samples and consequently to enhance their global trade.
Rad Source Technologies is a Suwanee, Georgia-based designer and manufacturer of X-ray irradiation systems used in a range of applications such as blood irradiation, small animal research and insect control.
The sensory attributes were evaluated within one day after the irradiation treatment.
PAN precursors were winded around glass tubes, and then were exposed to [gamma] ray irradiation from a [sup.60]Co source in vacuum at room temperature.
This work aimed to estimate the effect of gamma irradiation of fresh beef on the survival of E.
Hundreds of studies have proved that irradiation neither adds compounds to food nor takes nutrients away--and that it can help prevent the foodborne illnesses that sicken 48 million Americans and kill 3,000 every year.
Health and safety authorities of more than 40 countries have approved the use of irradiation in various types of food (it includes spices, cereal grains, legumes, grain products, fruit and vegetable products and meat).
LCCI Vice Presided Syed Mahmood Ghaznavi said this talking to a delegation of Pakistan Irradiation Services led by Kifayat Ullah here at the Lahore Chamber of Commerce & Industry on Thursday.