Search results
Results From The WOW.Com Content Network
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.
Effective doses can range from 6 μSv (0.006 mSv) for a 3 MBq chromium-51 EDTA measurement of glomerular filtration rate to 11.2 mSv (11,200 μSv) for an 80 MBq thallium-201 myocardial imaging procedure. The common bone scan with 600 MBq of technetium-99m MDP has an effective dose of approximately 2.9 mSv (2,900 μSv). [24]
The power of prognosis from a myocardial perfusion scan is excellent and has been well tested, and this is "perhaps the area of nuclear cardiology where the evidence is most strong". [ 13 ] [ 16 ] Many radionuclides used for myocardial perfusion imaging, including rubidium-82 , technetium-99m and thallium-201 have similar typical effective ...
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
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(I) iodide has the CsCl crystal structure. The monohalides, also known as thallous halides, all contain thallium with oxidation state +1. Parallels can be drawn between the thallium(I) halides and their corresponding silver salts; for example, thallium(I) chloride and bromide are light-sensitive, and thallium(I) fluoride is more soluble in water than the chloride and bromide.
The chemical reactivity of the Tl–C bond is also the lowest in the group, especially for ionic compounds of the type R 2 TlX. Thallium forms the stable [Tl(CH 3) 2] + ion in aqueous solution; like the isoelectronic Hg(CH 3) 2 and [Pb(CH 3) 2] 2+, it is linear. Trimethylthallium and triethylthallium are, like the corresponding gallium and ...
Tl 2 S can be prepared from the elements or by precipitating the sulfide from a solution of thallium(I), e.g. the sulfate or nitrate. Thin films have been deposited, produced from a mixture of citratothallium complex and thiourea. Heating the film in nitrogen at 300°C converts all the product into Tl 2 S [4]