| 131I | radioactive Iodine(used in Thyroid uptake, Liver & Kidney Scans & Treatment of malignant & nonmalig... |
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| 99mTc | radioactive Technetium(used in Brain Skull, Thyroid, Liver, Spleen, Bone & Lung scans) |
| RA | radioactive; ragocyte; ragweed antigen; rapidly adapting [receptors]; reactive arthritis; reciprocal... |
| RAIU | radioactive iodine uptake |
| RAMP | radioactive antigen microprecipitin; right atrial mean pressure |
| rose spots | Characteristic exanthema of typhoid fever; 10-20 small pink papules on the lower trunk lasting a few days and leaving hyperpigmentation. (05 Mar 2000) |
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| Rose-Waaler test | A test of historical interest: when sheep red cells are suspended in a concentration of antiserum to sheep red cells which is too low to cause agglutination, the addition of serum from a patient with rheumatoid arthritis will cause agglutination. (05 Mar 2000) |
| dog-rose | <botany> A common European wild rose, with single pink or white flowers. Source: Websters Dictionary (01 Mar 1998) |
| oil of rose | A volatile oil from the fresh flowers of Rosa gallica and R. Damascena and other members of the Rosaceae family. Used largely in perfumery; ointments, and toilet preparations. Synonym: attar of rose, essence of rose, otto of rose. (05 Mar 2000) |
| otto of rose | A volatile oil from the fresh flowers of Rosa gallica and R. Damascena and other members of the Rosaceae family. Used largely in perfumery; ointments, and toilet preparations. Synonym: attar of rose, essence of rose, otto of rose. (05 Mar 2000) |
| essence of rose | A volatile oil from the fresh flowers of Rosa gallica and R. Damascena and other members of the Rosaceae family. Used largely in perfumery; ointments, and toilet preparations. Synonym: attar of rose, essence of rose, otto of rose. (05 Mar 2000) |
| air pollutants, radioactive | Pollutants, present in air, which exhibit radioactivity. (12 Dec 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) |