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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 ?
In this frequency region, maximum panel vibration energy is transferred to sound so the sound transmission loss of the panel becomes lower.
Figure 7 shows the sound transmission loss (STL) test results of 2.
Carbon fiber panels were also tested for the sound transmission loss (STL) to evaluate the influence of unidirectional, braided, and non-crimped fabric (NCF) materials with epoxy resin on STL performance.
In the process of designing windshields for weight savings while offering enhanced impact performance through asymmetrical constructions, the degree of asymmetry between the glass plies can have a measured effect on the sound transmission loss performance, while holding the total weight constant.
7 shows a difference in the sound transmission loss properties of the construction in the 3500 to 6500 Hz range.
Analytic Sound Transmission Loss Calculations for Monolithic and Laminated Glazings