ટેક્નેશિયમ: આવૃત્તિઓ વચ્ચેનો તફાવત

{{ભાષાંતર}}

 

 

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 particle]]s. Long-lived [[isotopes of technetium|technetium isotopes]] produced commercially are by-products of [[nuclear fission|fission]] of [[uranium-235]] in [[nuclear reactor]]s and are extracted from [[nuclear fuel cycle|nuclear fuel rod]]s. Because no isotope of technetium has a [[half-life]] longer than 4.2 million years ([[technetium-98]]), its detection in [[red giant]]s in 1952, which are billions of years old, helped bolster the theory that stars can produce heavier elements.