tracer


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Related to tracer: traces, tracker

tracer

 [trās´er]
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.

trac·er

(trās'ĕr),
1. An element or compound containing atoms that can be distinguished from their normal counterparts by physical means (for example, radioactivity assay or mass spectrography) and can thus be used to follow (trace) the metabolism of the normal substances.
See also: tracing (2).
2. A colored or radioactive substance that can be injected in the region of a tumor (for example, melanoma, breast) to map the flow of lymph from the tumor to its nearest nodal basin; used in sentinel node detection.
See also: tracing (2).
3. A colored substance (for example, a dye) used as a tracer to follow the flow of water.
See also: tracing (2).
4. An instrument used in dissecting out nerves and blood vessels.
See also: tracing (2).
5. A mechanical device with a marking point attached to one jaw and a graph plate or tracing plate attached to the other jaw; used to record the direction and extent of movements of the mandible.
See also: tracing (2).
[M.E. track, fr. O. Fr. tracier, to make one's way, fr. L. traho, pp. tractum, to draw, + -er, agent suffix]

tracer

(trā′sər)
n.
An identifiable substance, such as a dye or a radioactive isotope, that is introduced into a biological or mechanical system and can be followed through the course of a process, providing information on the pattern of events in the process or on the redistribution of the parts or elements involved. Also called label.

tracer

Imaging A substance, such as a radioisotope, used in imaging procedures

trac·er

(trā'sĕr)
1. An element or compound containing atoms that can be distinguished from their normal counterparts by physical means (e.g., radioactivity assay or mass spectrography) and can thus be used to follow (trace) the metabolism of the normal substances.
2. A colored substance (e.g., a dye) used as a tracer to follow the flow of water.
3. An instrument used in dissecting out nerves and blood vessels.
4. A mechanical device with a marking point attached to one jaw and a graph plate or tracing plate attached to the other jaw; used to record the direction and extent of movements of the mandible.
See also: tracing (2)

tracer

1. A biochemical that has been tagged with a radioactive atom so that its destination can be determined.
2. A length of nucleic acid tagged with a radioactive atom that can be used to find and identify samples of its complementary strand.

tracer

any rare ISOTOPE, for example radioactive forms such as 14C, which is administered in some way to organisms so that its fate may be subsequently followed within the organism or in the products of its METABOLISM.

trac·er

(trā'sĕr)
1. A mechanical device with a marking point attached to one jaw and a graph plate or tracing plate attached to the other jaw; used to record direction and extent of mandibular movements.
2. An element or compound containing atoms that can be distinguished from their normal counterparts by physical means (e.g., radioactivity assay or mass spectrography) and can thus be used to follow (trace) metabolism of normal substances.
3. Colored or radioactive substance that can be injected in region of a tumor (e.g., melanoma, breast) to map lymph flow from tumor to its nearest nodal basin; used in sentinel node detection.
References in periodicals archive ?
Radio tracers are also used to detect leakages once the pipeline is in operation, therefore improving the safety aspects and conservation of the environment.
LTHE Tracer 900 retails at PS9249, the GT model at PS10,469 and will hit showrooms this month.
The best estimate for SIR was calculated for each subject by taking the median of the best five tracer element (V, Y, Sc, Ce, and Al) estimates.
Five tracer pebbles can be clearly distinguished when P is 0 and 1, but only four tracer pebbles can be distinguished when P is 2.
In these methods, the conventional way to present the response of a flow to the injection of a tracer is to graphically represent the variation in tracer concentration over time (the tracer response curve) detected in two or more cross sections downstream of the injection point, called sampling sections (the distances between the sections in this study are given in Table 1).
Figure 3a shows the measured tracer concentrations for all tracers.
He further added that BISP will soon hold another meeting with the service providers/training institutes of Khyber Pakhtunkhwa to share the results of Tracer Study.
Caption: From the left, Mrs Kashiwanwa Neshila, Development Officer: Alumni and Networking, University of Namibia, Ms Kumbi Short, General Consultant, International University of Management, Dr Kalumbi Shangula, Chairperson of the National Council for Higher Education, Mr Anneley Willemse, Senior Higher Education Officer at the National Council for Higher Education and Mr Efraim Dumeni, Manager: Information and Research, Polytechnic of Namibia, at the launch of the Namibia Tracer Studies Survey on Wednesday at the Polytechnic Hotel and Tourism School.
The exercise of tracer study is expected to be completed by the end of first quarter of current fiscal year.
In that era, consumers left traces of movement that could be tracked through paper sources, credit applications, credit bureau reports and postal change of addresses and the professional tracer had to develop many closed sources of information coupled with a keen sense of intuition, a good voice and persuasive abilities to locate them.