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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 experimental measurement of the sound transmission loss of a specimen, conducted in a pair of reverberation chambers separated by a window in which the test article can be installed, according to the ASTM E-90 standard [10], is based on:
Figure 6 shows the sound transmission loss (STL) test results of 4.
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.
After the superposition model was validated, the transmission loss and insertion loss of the muffer can be calculated for different phase delays between the sources.
Below the cutoff frequency, the breakout transmission loss for a circular duct can be predicted as
To assess the efficiency of the DE-based transmission loss
As a result, small transmission loss in on-body channel has been acquired.
The sound transmission loss (R) of a partition depends on it's mass, the stiffness and dimensions.
Sound Transmission Loss (TL) in decibels (dB) is an indication of how much noise a window will block out Acoustic performance is different as the frequent changes Lower frequencies (125 Hz, 250 Hz) are indicative of, vehicular traffic noise sources, while higher frequencies (500 Hz to 4000 Hz) are more indicative of pedestrian and other noise sources.
For those points on the outer perimeter of the coverage area, this reduced scan loss can dominate the increased range loss to that point, resulting in a lower overall transmission loss and improved performance.
The mass law states: if for a given wall the frequency is doubled, the transmission loss is doubled (increased by 6 dB); or, if for a given frequency the mass of the wall is doubled, the transmission loss is doubled.

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