| radioiodinated | Treated or combined with radioiodine. (05 Mar 2000) |
|---|---|
| radioiodinated serum albumin | A sterile, buffered, isotonic solution prepared to contain not less than 10 mg of radioiodinated normal human serum albumin per ml, and adjusted to provide not more than 1 mCi of radioactivity per ml; used as a diagnostic aid in determining blood volume and cardiac output. Synonym: radioiodinated serum albumin. (05 Mar 2000) |
| radioiodine | A radioactive isotope of iodine. (An isotope is an alternate version of a chemical element that has a different atomic mass). Radioiodine can be used in diagnostic tests as well as in radiotherapy of the thyroid.for hyperthyroidism, radioiodine is administered in capsule form on a one-time basis. It directly radiates thyroid tissues thereby destroying them. It takes 8-12 weeks for the thyroid to become euthyroid (normal) after treatment. The majority of patients undergoing this treatment eventually become hypothyroid, which is easily treated using thyroid hormones (levothyroxine). Radioiodine is contraindicated during pregnancy and breast feeding. (12 Dec 1998) |
| radioiron | A radioactive isotope of iron; e.g., 59Fe. (05 Mar 2000) |
| radioisotope | <chemical, radiobiology> Form of a chemical element with unstable neutron number, so that it undergoes spontaneous nuclear disintegration. Major use in biology is to trace the fate of atoms or molecules that follow the same metabolic pathway or enzymic fate as the normal stable isotope, but that can be detected with high sensitivity by their emission of radiation. Also used to locate the position of the radioactive metabolite, as in autoradiography and to measure relative rates of synthesis of compounds from radioactive precursors. (18 Nov 1997) |
| radioisotope dilution technique | Method for assessing flow through a system by injection of a known quantity of radionuclide into the system and monitoring its concentration over time at a specific point in the system. (12 Dec 1998) |
| radioisotope renography | Graphic tracing over a time period of radioactivity measured externally over the kidneys following intravenous injection of a radionuclide which is taken up and excreted by the kidneys. (12 Dec 1998) |
| radioisotope teletherapy | A type of high-energy radiotherapy using a beam of gamma-radiation produced by a radioisotope source encapsulated within a teletherapy unit. (12 Dec 1998) |
| radioisotopes | Isotopes that exhibit radioactivity and undergo radioactive decay. (12 Dec 1998) |
| radioisotopic purity | A loose term commonly used to denote radionuclidic purity. (05 Mar 2000) |
| radiolabelled | See: tag. (05 Mar 2000) |
| radiolabelled 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) |
| radiolaria | <zoology> Order of rhizopods, usually having a siliceous skeleton, or shell, and sometimes radiating spicules. The pseudopodia project from the body like rays. It includes the polycystines. See Polycystina. Origin: NL. See Radioli. Source: Websters Dictionary (01 Mar 1998) |
| radiolarian | <zoology> Of or pertaining to the Radiolaria. One of the Radiolaria. Source: Websters Dictionary (01 Mar 1998) |
| radiolead | A radioactive isotope of lead. (05 Mar 2000) |