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thallium

 [thal´e-um]
a chemical element, atomic number 81, atomic weight 204.37, symbol Tl. (See Appendix 6.) Its salts are active poisons that may cause alopecia, liver and kidney damage, blindness, and neurologic and psychic symptoms such as ataxia, restlessness, delirium, hallucinations, delusions, and semicoma.
thallium 201 a radioactive isotope of thallium having a half-life of 3.05 days and decaying by electron capture with emission of gamma rays. It is used as a diagnostic aid in the form of thallous chloride Tl 201.
thallium scan a scintiscan involving the use of thallium 201. The radioisotope is administered intravenously and localizes, like calcium, in the myocardium. A scintillation camera produces an image of the distribution of the radioisotope. Areas of inadequate perfusion appear as “cold spots,” thus pinpointing the site of occlusions of the coronary arteries.



The thallium scan offers many advantages. It is noninvasive except for the administration of the radioisotope, which involves a radiation dose slightly larger than that received during a chest x-ray, and is extremely accurate.

The thallium-201 may be administered while the patient is exercising on a treadmill and being monitored by electrocardiogram. Subsequent scintigrams show areas of inadequate perfusion. This test is less likely than conventional exercise or stress testing to indicate disease when none is present and is more likely to detect disease when it is present. See also exercise thallium scintigraphy and myocardial perfusion scintigraphy.

Tl

Symbol for thallium.

Tl

thallium.

Tl

symbol for the element thallium.

Tl

Symbol for thallium

TL,

adj thoracolumbar; of or relating to the torso region, specifically the chest and lower back areas.

Tl

chemical symbol, thallium.
References in periodicals archive ?
The transmission loss will have the highest value for a normally incident sound, [theta]=0.
For the calculation of the transmission loss elementary geometries of walls or housings with a homogeneous material distribution are assumed.
Equalizer circuit in the receiver unit for transmission loss (ISSCC presentation 2.
They can be used to find the transmission loss and can be used in insertion loss calculations.
These very advanced electrical properties allow for high signal speed transfers and reduced transmission loss.
2) Dispersion-shifted fiber in L-band:Dispersion-shifted fiber (DSF) is a type of single-mode optical fiber that is tailored to shift the zero-dispersion wavelength from 1,310 nm to 1,550 nm, a wavelength in which the transmission loss is smaller.
Transmission loss refers to the attenuation of a particular component and does not depend upon the source or termination conditions.
The Serenity Sidelite Frame combines a single door frame with an attached window and carries a Sound Transmission Class (STC) rating of 35 per ASTM E90 (Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements) and ASTM E413 (Classification for Rating Sound Insulation).
Beside power generation, transmission loss is also one of the major concerns as heavy transmission losses are being incurred by the AC system.

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