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Technetium (43 Tc) is one of the two elements with Z < 83 that have no stable isotopes; the other such element is promethium. [2] It is primarily artificial, with only trace quantities existing in nature produced by spontaneous fission (there are an estimated 2.5 × 10 −13 grams of 99 Tc per gram of pitchblende) [3] or neutron capture by molybdenum.
A chart or table of nuclides maps the nuclear, or radioactive, behavior of nuclides, as it distinguishes the isotopes of an element.It contrasts with a periodic table, which only maps their chemical behavior, since isotopes (nuclides that are variants of the same element) do not differ chemically to any significant degree, with the exception of hydrogen.
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96 Nb 97 Mo 98 Tc 99 Ru 100 Rh 101 Pd 102 Ag 103 Cd 104 In 105 Sn 106 Sb 107 Te 108 I 109 Xe Cs 56; 56 ... 182 Pb Bi 84; 101 161 Nd 162 Pm 163 Sm 164 Eu 165 Gd 166 Tb ...
Technetium (99m Tc) sestamibi ("Cardiolite") is widely used for imaging of the heart. Technetium forms a variety of coordination complexes with organic ligands. Many have been well-investigated because of their relevance to nuclear medicine. [54] Technetium forms a variety of compounds with Tc–C bonds, i.e. organotechnetium complexes.
TC 4: Rolling bearings: TC 5: Ferrous metal pipes and metallic fittings: TC 6: Paper, board and pulps: TC 7: Rivets: Disbanded TC 8: Ships and marine technology: TC 9: Shipbuilding details for sea navigation: Disbanded TC 10: Technical product documentation: TC 11: Boilers and pressure vessels: STANDBY TC 12: Quantities and units: TC 13: Shaft ...
Any TC can form one or more SCs depending on the extent of its work programme. SCs define their scope under the parent TC to which they report directly. TC membership is composed of the IEC NCs (National Committees), all of which are free to take part in the work of any given TC.
Gemini, a lightweight, collaboratively designed protocol, striving to fill the gap between Gopher and HTTP [160] 1967: Unofficial: Cisco IOS IP Service Level Agreements Control Protocol [citation needed] 1972: Yes: InterSystems Caché, and InterSystems IRIS versions 2020.3 and later 1984: Yes: Big Brother: Unofficial: Arweave mining node [161 ...