thallium is a monovalent cation. Thallium has 31 isotopes, but the 2 most common isotopes are 203Tl and 205Tl. The chemical symbol for Thallium is Tl. In recent years, thallium compounds have also been used in the development of high-temperature superconductive films, tapes and wires for magnetic energy storage, imaging and propulsion applications. The use of 203Tl is used to produce one of the most used isotopes in nuclear medicine: 201Tl. Thallium is used in manufacturing, as well as in some chemical reactions and medical procedures. The use for 205Tl is used in nuclear - magnetic resonance research. Thallium-201 (Th-201) is a radiopharmaceutical used for scintigraphy, primarily of the myocardium. Sometimes called a "Thallium scan" or "nuclear scintigraphy", this stress test is similar to an echo stress test, but it focuses in more on the coronary arteries and their ability to deliver blood to the heart under stress.A Thallium stress test may be indicated if the echo stress test was inconclusive, or it may be done instead, if there is a likelihood of coronary artery disease. Thallium is a toxic metal and hence it has limited uses. Thallium is a naturally occurring trace metalloid element with atomic symbol Tl, atomic number 81, and atomic weight 204.383. Thallium is found in many compounds such as these: crooksite, hutchinsonite, and lorandite. Thallium metal is mostly used for producing photoelectric cells. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 electrons in the atomic structure. In addition, research activity with thallium is ongoing to develop high-temperature superconducting materials for such applications as magnetic resonance imaging, storage of magnetic energy, magnetic propulsion, and electric power generation and transmission. Since thallium(I) sulfate is a simple powder with indistinctive properties, it can easily be mistaken for more innocuous chemicals. Thallium(I) sulfate is soluble in water and its toxic effects are derived from the thallium(I) cation. A thallium stress test is a nuclear imaging study that shows how well blood flows to the heart muscle. There is ongoing research with thallium to develop high-temperature superconducting materials (wires) for applications such as magnetic resonance imaging, storage of magnetic energy, magnetic propulsion, and electric power generation and transmission, as well as filters in wireless communication. Use as a pesticide has been banned in the United States due to toxicity from accidental exposure. In thermometer’s mercury alloy has 8% of thallium, as it … Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here! The mean lethal dose of thallium(I) sulfate for an adult is about 1 gram. Thallium-201 radionuclide myocardial perfusion imaging — Thallium-201 was introduced as a perfusion tracer because of its high (approximately 80 percent) first pass myocardial extraction fraction across physiologic ranges of myocardial blood flow . It usually is combined with an exercise stress test on a treadmill or stationary bicycle. The element thallium is treated by the body as an analog of potassium; it is produced in a cyclotron by bombarding thallium-203 with protons.. Characteristics. Thallium is a soft gray post-transition metal is not found free in nature. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. Thallium is not only a highly effective depilatory, it is also an extraordinarily nasty poison.