193Ir

193Ir is a stable isotope of the chemical element iridium (atomic number 77) with a mass number of 193. It is one of the two naturally occurring isotopes of iridium; the other is 191Ir. In natural iridium, 193Ir accounts for about 62.7% of the element’s abundance, while 191Ir makes up about 37.3%.

As a stable nuclide, 193Ir does not undergo radioactive decay and has no practical half-life. It shares all the chemical properties of iridium, so its presence does not alter iridium’s chemistry in compounds or alloys. Iridium itself is a very dense, hard, corrosion-resistant transition metal belonging to the platinum group and is typically found in trace amounts in the Earth’s crust.

Natural iridium occurs as a mixture of isotopes, and the isotopic composition is used in geochemical and cosmochemical studies to understand processes such as ore formation and planetary differentiation. However, unlike the closely studied radiative isotope 192Ir, 193Ir is not used as a radioisotope source or in radiotherapy.

Summary: 193Ir is a stable, naturally occurring isotope of iridium, comprising a majority of natural Ir with an abundance around 62.7%. It shares the chemical behavior of iridium and, as a stable isotope, has no radioactive applications.