Technetium - Periodic Table of Videos
TECHNETIUM 99m
i am radioactive! or: my technetium scintigraphy
Reso - Technetium
Reso - Technetium
Technetium (element #43)
Technetium 99m Medium
Dj Technetium- Yaranaika
DJ-Technetium - Lovely AILIEN
nuclear medicine and technetium cows
DJ-Technetium - maid in Japan
Technetium-99m
Technetium
Technetium 99m
Technetium - Periodic Table of Videos
TECHNETIUM 99m
i am radioactive! or: my technetium scintigraphy
Reso - Technetium
Reso - Technetium
Technetium (element #43)
Technetium 99m Medium
Dj Technetium- Yaranaika
DJ-Technetium - Lovely AILIEN
nuclear medicine and technetium cows
DJ-Technetium - maid in Japan
Technetium-99m
Technetium
Technetium 99m
Technetium Nosce te Ipsum
Technetium 99m
Technetium Mission Control
Technetium - Agencja Reklamowa - film reklamowy
Synthesis of Technetium ( Z = 43) Alloys at UNLV
Technetium 99 -
science vid technetium 99m 2
DJ-Technetium - Tc-ma_009
Nuclear Chemistry part 4/4 Technetium 99
Technetium ( /tɛkˈniːʃiəm/ tek-NEE-shee-əm) is the chemical element with atomic number 43 and symbol Tc. It is the lowest atomic number element without any stable isotopes; every form of it is radioactive. Nearly all technetium is produced synthetically and only minute amounts are found in nature. Naturally occurring technetium occurs as a spontaneous fission product in uranium ore or by neutron capture in molybdenum ores. The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese.
Many of technetium's properties were predicted by Dmitri Mendeleev before the element was discovered. Mendeleev noted a gap in his periodic table and gave the undiscovered element the provisional name ekamanganese (Em). In 1937, technetium (specifically the technetium-97 isotope) became the first predominantly artificial element to be produced, hence its name (from the Greek τεχνητός, meaning "artificial").
Its short-lived gamma ray-emitting nuclear isomer—technetium-99m—is used in nuclear medicine for a wide variety of diagnostic tests. Technetium-99 is used as a gamma ray-free source of beta particles. Long-lived technetium isotopes produced commercially are by-products of fission of uranium-235 in nuclear reactors and are extracted from nuclear fuel rods. Because no isotope of technetium has a half-life longer than 4.2 million years (technetium-98), its detection in 1952 in red giants, which are billions of years old, helped bolster the theory that stars can produce heavier elements.