| radio-flagellata | <zoology> A group of Protozoa having both flagella and pseudopodia. Origin: NL. See Radiate, and Flagellata. Source: Websters Dictionary (01 Mar 1998) |
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| 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) |
| 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) |
Synonyms : Radioisotope Dilution Technic, Dilution Technic, Radioisotope, Dilution Technics, Radioisotope, Dilution Technique, Radioisotope, Dilution Techniques, Radioisotope, Radioisotope Dilution Technics, Radioisotope Dilution Techniques
Synonyms : Radioisotope Renographies, Renographies, Renographies, Radioisotope, Renography, Radioisotope
Synonyms : Teletherapy, Radioisotope, Therapy, Teleradioisotope
Synonyms : Isotopes, Radioactive
Synonyms : Assay, Radioligand, Assay, Radioreceptor, Assays, Radioligand, Assays, Radioreceptor, Protein Binding Radioassay, Protein-Binding Radioassays, Radioassay, Protein-Binding, Radioassays, Protein-Binding, Radioligand Assays, Radioreceptor Assays
| Radovici's sign |
(Ra
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| radioreceptor |
(ra
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| radiostrontium |
(ra
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| radiosurgery |
(ra
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| radiotelemetry |
(ra
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| rad | opacity to X-rays or other radiation |
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| rad | not transparent to X-rays or other forms of radiation |
| rad | electronic equipment consisting of a combination of a radio receiver and a record player |
| rad | exhibiting or caused by radioactivity |
| rad | measurement of the amount of radioactive material (usually carbon 14) that an object contains |
| rad | the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation |
| rad | the radioactive particles that settle to the ground after a nuclear explosion |
| rad | radioactive iodine test that measures the amount of radioactive iodine excreted in the urine |
| rad | test of thyroid function in which the patient is give an oral does of radioactive iodine-131 |
| rad | radioactive iodine test that measures the amount of radioactive iodine taken up by the thyroid gland |
| rad | material that is radioactive |
| rad | useless radioactive materials that are left after some laboratory or commercial process is completed |