Technetium Radioactive

Technetium is a radioactive element of the 4th period of D. I. Mendeleev’s periodic table of chemical elements, with atomic number 43.
Technetium has two stable isotopes: Te (isotope with mass number 123) and Te* (isotope with mass number 204). The remaining isotopes of technetium are radioactive.

Technetium was discovered in 1937 by Swedish chemist Niels Guden. Its name comes from the Greek word "techne", which means "art, craft" or "technique".

Technetium is a transuranium element, meaning its mass number is greater than 90. It is a very heavy element, its atomic radius is larger than that of other elements. Technetium is not a metal, but it does have some metallic properties. It has a silvery-white color and is highly reactive.

In nature, technetium occurs in the form of several radioactive isotopes. The most common isotope is Te-99, which has a half-life of 223 days. Te-121, Te-123 and Te-132 are also widely distributed isotopes.

The best known isotope of technetium is Te-99m, which is used in nuclear medicine to diagnose diseases. This isotope has a half-life of about 6 hours and emits gamma radiation with an energy of 140 keV.

In addition, technetium is used in the production of nuclear reactors, where it is used to control and control the process. Technetium can also be used as an indicator of radioactivity in the environment.

Thus, technetium is a radioactive element that has several isotopes with different properties. It is widely used in nuclear physics and medicine.

Technetium is a radioactive substance occupying an intermediate position between lanthanides and actionides. The 123I isotope also has a half-life of about 4 hours, although they have very different chemical properties and uses. It should also be noted that the half-life of 42K is also 4.47x109 years.

Technetium isotopes have not received significant use in isotope separation in the operation of a neutronization reactor; they are not used in fractional crystallization in nuclear chemistry. Uranium and 45K have intermediate half-lives, but are stable with respect to α-radiation, and therefore do not require a nuclear fuel reactor deactivation procedure after operation and disposal of spent fuel nuclei. Isotope