radioactive tracer

Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.


1. a means or agent by which certain substances or structures can be identified or followed, as a radioactive tracer.
2. a mechanical device by which the outline of an object or the direction and extent of movement of a part may be graphically recorded; see also tracing.
3. a dissecting instrument for isolating vessels and nerves.
radioactive tracer a radioactive isotope replacing a stable chemical element in a compound (said to be radiolabeled) and so able to be followed or tracked through one or more reactions or systems by means of a radiation detector; used especially for such a compound that is introduced into the body for study of the compound's metabolism, distribution, and passage through the body.

radioactive tracer

a molecule containing a radioactive atom, which can be followed through a physiological system with radiation detectors.

radioactive tracer,

n a molecule to which a radioactive atom has been attached so that it can be followed through a physiologic system with radiation detectors.


characterized by radioactivity.

radioactive decay
spontaneous decomposition of the nuclei of the atoms of radioactive substances. Measured as the proportion of the atoms in a radionuclide that decompose per unit of time, usually stated as the half-life of that particular isotope.
radioactive fallout
dissemination of radioactive substances through the atmosphere and deposition on the environment generally; causes radiation injury.
radioactive isotope
radionuclide. A radioactive nuclide, e.g. radioactive iodine or strontium.
radioactive tracer
see radioactive tracer.


a means by which something may be followed, as (1) a mechanical device by which the outline or movements of an object can be graphically recorded, or (2) a material by which the progress of a compound through the body may be observed.

radioactive tracer
a radioactive isotope replacing a stable chemical element in a compound introduced into the body, enabling its metabolism, distribution and elimination to be followed in the living animal.
References in periodicals archive ?
Application of Radioactive Tracer Technology in the Real-time Measurement of Wear and Corrosion.
Mutated cancer cells accumulate more of the radioactive tracers because they are growing faster than healthy tissue and need more sugar for growth.
To detect the tissue distribution of GS-Rd after administration, radioactive tracer assay was performed.
The main advantage of MR-based techniques is that they do not expose the subject to radioactive tracers and therefore can be used repeatedly in the same subject, allowing researchers to track metabolic or structural changes over time.
In the preliminary study, researchers used an experimental radioactive tracer called iodofiltic acid I 123 (trade name Zemiva) to detect this use of glucose.
A special technique was used in the last stage of the gas injection pilot, whereby an environment-friendly radioactive tracer material, known as tritiated methane, was injected with the gas at the start-up.
SwRI drew on its long experience with radioactive tracer technology (RAIT) to develop the new tool.
Before imaging, patients receive an injection of a cancer-specific radioactive tracer called sestamibi.
To carry out a scan, a radioactive tracer is first injected into the patient's bloodstream.
A radioactive tracer is injected in the patient, and the scan evaluates as the organs process the tracer.
In mapping, a radioactive tracer with blue dye is injected at the midplane of the tumor mass or previous biopsy cavity, said Dr.
Using a dye or radioactive tracer, doctors will be able to identify the first sentinel lymph node near the tumor, and remove only that node to determine if the cancer has spread.

Full browser ?