| radio frequency or radiofrequency | <physics> Term used to describe electromagnetic radiation with frequencies less than infrared, but greater than audio frequencies, i.e., greater than about 15,000 Hz. Wavelengths are therefore less than about 20,000 km and greater than about 0.01 mm. (These numbers are not precise.) (09 Oct 1997) |
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| radio label | A mildly radioactive molecule that is used to tag another molecule (such as a protein) so that it can be identified as it goes through some kind of biochemical process. (09 Oct 1997) |
| radio wave | <physics> Electromagnetic radiation with wavelengths of 300 millimetres or longer (even up to several kilometres). Radiation of this type is used to broadcast radio and television signals, and has frequencies up to thousands of megahertz (or one gigahertz). (09 Oct 1997) |
| radio waves | That portion of the electromagnetic spectrum beyond the microwaves, with wavelengths as high as 30 km. They are used in communications, including television. Short wave or hf (high frequency), uhf (ultrahigh frequency) and vhf (very high frequency) waves are used in citisen's band communication. (12 Dec 1998) |
| radio-flagellata | <zoology> A group of Protozoa having both flagella and pseudopodia. Origin: NL. See Radiate, and Flagellata. Source: Websters Dictionary (01 Mar 1998) |
| radioactive | Giving off radiation. (12 Dec 1998) |
| radioactive atom | <chemistry, physics> An atom with an unstable nucleus, which emits particulate or electromagnetic radiation (radioactive emission) to achieve greater stability. See: radionuclide, half-life, Becquerel. (05 Mar 2000) |
| radioactive constant | <physics, radiobiology> The fraction of the amount of a radionuclide that undergoes transition per unit time. Formally: Lamda=dP/dt Where dP is the probability of a given nucleus undergoing spontaneous nuclear transition in the time interval dt. (16 Dec 1997) |
| radioactive contamination | <radiobiology> Radioactive substance dispersed in material or places where it is undesirable. (16 Dec 1997) |
| radioactive cow | Colloquialism for radionuclide generator. See: cow. (05 Mar 2000) |
| radioactive decay | <physics> The process by which a spontaneous change in nuclear state takes place. This process is accompanied by the emission of energy in various specific combinations of electromagnetic and corpuscular radiation and neutrinos. (16 Dec 1997) |
| radioactive equilibrium | <radiobiology> That condition in which the activities of the members of a radioactive chain decrease exponentially in time with the half-life of the chain precursor. Such radioactive equilibrium is only possible when the half-life of the precursor is longer than that of any other chain member. If the precursor half-life is so long that the change in the precursor population during the period of interest can be ignored, all the activities become sensibly equal and the equilibrium is said to be secular, otherwise it is said to be transient. (16 Dec 1997) |
| radioactive fallout | The material that descends to the earth or water well beyond the site of a surface or subsurface nuclear explosion. (12 Dec 1998) |
| radioactive iodide uptake test | A test of thyroid function in which 131I-iodide is given orally; after 24 hours, the amount present in the thyroid gland is measured and compared with normal values. Synonym: radioactive iodide uptake test, RAI test. (05 Mar 2000) |
| radioactive iodine | Iodine that gives off radiation. See radioiodine. (12 Dec 1998) |
Synonyms :
Synonyms : Radiosurgery, Gamma Knife, Radiosurgery, Linac, Radiosurgery, Linear Accelerator, Radiosurgery, Stereotactic, Body Radiotherapies, Stereotactic, Body Radiotherapy, Stereotactic, Gamma Knife Radiosurgeries, Linear Accelerator Radiosurgeries, Radiosurgeries
Synonyms : Radiotherapies, Radiotherapies, Targeted, Targeted Radiotherapies
Synonyms : Dosage, Radiotherapy, Dosages, Radiotherapy, Radiotherapy Dosages
Synonyms : Planning, Computer-Assisted Radiotherapy, Calculation, Computer-Assisted Dosimetry, Calculations, Computer-Assisted Dosimetry, Computer Assisted Radiotherapy Planning, Computer-Assisted Dosimetry Calculation, Computer-Assisted Dosimetry Calculations
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| Rauwolfia |
any of several alkaloids extracted from the shrub Rauwolfia serpentina any shrub or small tree of the genus Rauwolfia having leaves in whorls and cymose flowers; yield substances used medicinally especially as emetics or purgatives or antihypertensives
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| raceme |
usually elongate cluster of flowers along the main stem in which the flowers at the base open first
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| radiotherapy |
(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
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| Raynaud's sign |
acrocyanosis: cyanosis of the extremities; can occur when a spasm of the blood vessels is caused by exposure to cold or by strong emotion
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| radioulnar |
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| RA | the amount of electromagnetic radiation leaving or arriving at a point on a surface |
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| RA | an attractive combination of good health and happiness |
| RA | the quality of being bright and sending out rays of light |
| RA | radiating or as if radiating light |
| RA | energy that is transmitted in the form of (electromagnetic) radiation |
| RA | the rate of flow of radiant energy (electromagnetic waves) |
| RA | heating a building by radiation from panels containing hot water or electrical heaters |
| RA | in a radiant manner |
| RA | send out real or metaphoric rays |
| RA | spread into new habitates and produce variety or variegate |
| RA | issue or emerge in rays or waves |
| RA | experience a feeling of well-being or happiness, as from good health or an intense emotion |
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