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In order to obtain spatial information about the gamma-ray emissions from an imaging subject (e.g. a person's heart muscle cells which have absorbed an intravenous injected radioactive, usually thallium-201 or technetium-99m, medicinal imaging agent) a method of correlating the detected photons with their point of origin is required.
Scintigraphy (from Latin scintilla, "spark"), also known as a gamma scan, is a diagnostic test in nuclear medicine, where radioisotopes attached to drugs that travel to a specific organ or tissue (radiopharmaceuticals) are taken internally and the emitted gamma radiation is captured by gamma cameras, which are external detectors that form two-dimensional images [1] in a process similar to the ...
Thallium-202 (half-life 12.23 days) can be made in a cyclotron [4] while thallium-204 (half-life 3.78 years) is made by the neutron activation of stable thallium in a nuclear reactor. [ 5 ] In the fully ionized state, the isotope 205 Tl 81+ becomes beta-radioactive, undergoing bound-state β − decay to 205 Pb 81+ with a half-life of 291 +33
Thallium poisoning is poisoning that is due to thallium and its compounds, which are often highly toxic. [1] Contact with skin is dangerous and adequate ventilation should be provided when melting this metal. [2] Many thallium compounds are highly soluble in water and are readily absorbed through the skin. [3]
Example thallide monoclinic Cs 7.29 K 5.71 Tl 13 containing [Tl 6] 6− and [Tl 7] 7− clusters. Thallides are compounds containing anions composed of thallium.There are several thallium atoms in a cluster, and it does not occur as a single Tl − in thallides.
Myocardial perfusion imaging or scanning (also referred to as MPI or MPS) is a nuclear medicine procedure that illustrates the function of the heart muscle . [ 1 ] It evaluates many heart conditions, such as coronary artery disease (CAD), [ 2 ] hypertrophic cardiomyopathy and heart wall motion abnormalities.
Similarly, thallium(I) aryl compounds require steric bulk for their isolation. [4] A well-known organothallium(I) species is thallium cyclopentadienide. It arises by treatment of thallium(I) salts, such as thallium sulfate, with cyclopentadiene. Thallium(I) cyclopentadienide adopts a zig-zag chain structure of cyclopentadienide and thallium. [5]
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