Technetium: Difference between revisions
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'''Technetium''' is a | {{DISPLAYTITLE:Technetium}} | ||
[[File:Periodisches_System_der_Elemente_(1904-1945,_now_Gdansk_University_of_Technology).jpg|thumb|right|Technetium in the periodic table]] | |||
'''Technetium''' is a chemical element with the symbol '''Tc''' and atomic number 43. It is the lightest element whose isotopes are all radioactive; none are stable. Nearly all technetium is produced synthetically, and it is primarily used in the field of [[nuclear medicine]]. | |||
==History== | ==History== | ||
Technetium was | Technetium was the first element to be artificially produced. It was discovered in 1937 by [[Carlo Perrier]] and [[Emilio Segrè]] in a sample of molybdenum that had been bombarded with deuterons in a cyclotron. The element was named from the Greek word "technetos," meaning "artificial," reflecting its synthetic origin. | ||
==Properties== | |||
Technetium is a silvery-gray metal that tarnishes slowly in moist air. It is a member of the [[transition metals]] and is located in group 7 of the periodic table. Technetium is chemically similar to [[rhenium]] and [[manganese]]. | |||
== | ===Isotopes=== | ||
[[File:First_technetium-99m_generator_-_1958.jpg|thumb|left|First technetium-99m generator - 1958]] | |||
The most common isotope of technetium is technetium-99, which is a product of the fission of [[uranium-235]] in nuclear reactors. Technetium-99m, a metastable nuclear isomer, is used in various diagnostic tests in nuclear medicine due to its short half-life of about 6 hours and its ability to emit gamma rays. | |||
==Applications== | ==Applications== | ||
Technetium is primarily used in [[nuclear medicine]] for diagnostic imaging. The isotope technetium-99m is used in approximately 85% of all diagnostic imaging procedures in nuclear medicine. It is used in [[bone scans]], [[myocardial perfusion imaging]], and other diagnostic tests. | |||
[[File:Pertechnetate1.svg|thumb|right|Pertechnetate ion structure]] | |||
===Chemical Compounds=== | |||
Technetium forms a variety of chemical compounds, including oxides, halides, and complex ions. The pertechnetate ion (TcO₄⁻) is the most stable form of technetium in aqueous solutions and is used in many radiopharmaceuticals. | |||
[[File:Chloro-containing_coordination_complexes_of_technetium_(Tc-99).jpg|thumb|left|Chloro-containing coordination complexes of technetium (Tc-99)]] | |||
==Production== | |||
Technetium is produced as a byproduct of the fission of uranium-235 in nuclear reactors. It can also be produced by bombarding molybdenum-98 with neutrons. The extraction of technetium from spent nuclear fuel involves complex chemical processes. | |||
== | ==Safety== | ||
* [[ | Technetium is radioactive, and its handling requires precautions to avoid exposure. The most common isotope, technetium-99, has a half-life of 211,000 years and decays by beta emission. Proper shielding and handling protocols are essential to ensure safety. | ||
==Related pages== | |||
* [[Nuclear medicine]] | |||
* [[Radioisotope]] | |||
* [[Periodic table]] | * [[Periodic table]] | ||
* [[Transition metals]] | |||
[[Category:Transition metals]] | |||
[[Category:Chemical elements]] | [[Category:Chemical elements]] | ||
[[Category: | [[Category:Nuclear medicine]] | ||
Latest revision as of 10:55, 23 March 2025
.jpg)
Technetium is a chemical element with the symbol Tc and atomic number 43. It is the lightest element whose isotopes are all radioactive; none are stable. Nearly all technetium is produced synthetically, and it is primarily used in the field of nuclear medicine.
History[edit]
Technetium was the first element to be artificially produced. It was discovered in 1937 by Carlo Perrier and Emilio Segrè in a sample of molybdenum that had been bombarded with deuterons in a cyclotron. The element was named from the Greek word "technetos," meaning "artificial," reflecting its synthetic origin.
Properties[edit]
Technetium is a silvery-gray metal that tarnishes slowly in moist air. It is a member of the transition metals and is located in group 7 of the periodic table. Technetium is chemically similar to rhenium and manganese.
Isotopes[edit]
The most common isotope of technetium is technetium-99, which is a product of the fission of uranium-235 in nuclear reactors. Technetium-99m, a metastable nuclear isomer, is used in various diagnostic tests in nuclear medicine due to its short half-life of about 6 hours and its ability to emit gamma rays.
Applications[edit]
Technetium is primarily used in nuclear medicine for diagnostic imaging. The isotope technetium-99m is used in approximately 85% of all diagnostic imaging procedures in nuclear medicine. It is used in bone scans, myocardial perfusion imaging, and other diagnostic tests.
Chemical Compounds[edit]
Technetium forms a variety of chemical compounds, including oxides, halides, and complex ions. The pertechnetate ion (TcO₄⁻) is the most stable form of technetium in aqueous solutions and is used in many radiopharmaceuticals.
.jpg)
Production[edit]
Technetium is produced as a byproduct of the fission of uranium-235 in nuclear reactors. It can also be produced by bombarding molybdenum-98 with neutrons. The extraction of technetium from spent nuclear fuel involves complex chemical processes.
Safety[edit]
Technetium is radioactive, and its handling requires precautions to avoid exposure. The most common isotope, technetium-99, has a half-life of 211,000 years and decays by beta emission. Proper shielding and handling protocols are essential to ensure safety.
