| radioactive isotope | <physics, radiobiology> An isotope of an element that has an unstable nucleus, it tries to stabilise itself by giving off ionising radiation. (09 Oct 1997) |
|---|---|
| radioactive pollutants | Radioactive substances which act as pollutants. They include chemicals whose radiation is released via radioactive waste, nuclear accidents, fallout from nuclear explosions, and the like. (12 Dec 1998) |
| radioactive probe | A nucleic acid fragment, labelled by a radioisotope, biotin, etc., that is complementary to a sequence in another nucleic acid (fragment) and that will, by hydrogen binding to the latter, locate or identify it and be detected; a diagnostic technique based on the fact that every species of microbe possesses some unique nucleic acid sequences which differentiate it from all others, and thus can be used as identifying markers or "fingerprints." (05 Mar 2000) |
| radioactive thyroxine | Thyroxine in which a radioisotope of iodine (125I or 131I) is incorporated into its molecule; used in experiments tracing the metabolism of thyroxine. Synonym: labelled thyroxine, radiolabelled thyroxine, radiothyroxin. (05 Mar 2000) |
| radioactive tracer | <physics, radiobiology> A radioisotope is an element which has the same atomic number as another but a different atomic weight, exhibiting the property of spontaneous decomposition. Decomposition gives off radiation (gamma rays) that can be detected with a counter. If a radioisotope is attached to a biological compound and injected into the body, its path may be traced through the body (resulting in an image). (27 Sep 1997) |
| radioactive tracers | Radioactive substances added in minute amounts to the reacting elements or compounds in a chemical process and traced through the process by appropriate detection methods, e.g., geiger counter. Compounds containing tracers are often said to be tagged or labelled. (12 Dec 1998) |
| radioactive waste | <radiobiology> Equipment and materials from nuclear operations which are radioactive and for which there is no further anticipated use. Wastes are generally classified as high-level (having radioactivity concentrations of hundreds to thousands of curies per gallon or cubic foot), low-level (in the range of 1 microcurie per gallon or cubic foot), or intermediate (between high and low). See: curie. (09 Oct 1997) |
| radioactivity | <radiobiology> The quality of emitting or the emission of corpuscular or electromagnetic radiations consequent to nuclear disintegration, a natural property of all chemical elements of atomic number above 83 and possible of induction in all other known elements. (18 Nov 1997) |
| radioallergosorbent test | An allergy test done on a sample of blood. The aim with rast, as with skin tests, is to check for allergic sensitivity to specific substances. Rast stands for radioallergosorbent test. (12 Dec 1998) |
| radioautogram | Older term for autoradiograph. (05 Mar 2000) |
| radioautography | <technique> A specimen containing radioactive atoms is overlaid with a photographic emulsion (X-ray film), which is subsequently developed, revealing the localisation of radioactivity as a pattern of silver grains. Resolution is determined by the path length of the radiation and so the low energy beta emitting isotope, tritium, is usually used. The technique can be used to visualise radioactively labelled molecules or fragments of molecules, used in analyzing length and number of DNA fragments after they are separated by gel electrophoresis. (12 Mar 1998) |
| radiobicipital | Relating to the radius and the biceps muscle. (05 Mar 2000) |
| radiobicipital reflex | Contraction of the biceps muscle which sometimes occurs in the elicitation of the brachioradial reflex. (05 Mar 2000) |
| radiobiology | Study of the scientific principles, mechanisms, and effects of the interaction of ionizing radiation with living matter. (12 Dec 1998) |
| radiocalcium | A radioisotope of calcium, particularly calcium-45. (05 Mar 2000) |
Synonyms : Adjuvant Radiotherapy, Adjuvant Radiotherapies, Radiotherapies, Adjuvant
Synonyms : Computer-Assisted Radiation Therapy, Computer Assisted Radiation Therapy, Computer Assisted Radiotherapy, Computer-Assisted Radiation Therapies, Computer-Assisted Radiotherapies, Radiation Therapies, Computer-Assisted, Radiation Therapy, Computer Assisted
Synonyms : Conformal Radiotherapies, Radiotherapies, Conformal
Synonyms : High-Energy Radiotherapy, Radiotherapy, Megavolt, High Energy Radiotherapy, Radiotherapy, High Energy
Synonyms : Intensity-Modulated Radiotherapies, Intensity-Modulated Radiotherapy, Radiotherapies, Intensity-Modulated, Radiotherapy, Intensity Modulated
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| radix |
(ra
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| rage |
(rage) (r[amacr]j) a state of violent anger.
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| Raillietina |
(Rail
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| radiation alopecia |
radiation-induced alopecia, transient hair loss following exposure to ionizing radiation.
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| radiation chimera |
an organism that survives with immunologic characteristics of host and donor after a bone marrow graft from an antigenically different donor, the host having first been subjected to sublethal whole-body irradiation so that there is reduced or no immune response to foreign cells by the donor.
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| RA | cause to be seen by emitting light as if in rays |
|---|---|
| RA | esp. of the complexion: show a strong bright color, such as red or pink |
| RA | extend or spread outward from a center or focus or inward towards a center |
| RA | send out rays or waves |
| RA | diverging from a common point |
| RA | (medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance |
| RA | the act of spreading outward from a central source |
| RA | a radial arrangement of nerve fibers connecting different parts of the brain |
| RA | the spread of a group of organisms into new habitats |
| RA | energy that is radiated or transmitted in the form of rays or waves or particles |
| RA | the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay |
| RA | syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions) |
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