Nuklida · stabil · alami

Talium-205 (²⁰⁵Tl)

Talium-205 (²⁰⁵Tl) adalah isotop stabil talium dengan 81 proton dan 124 neutron (nomor massa 205). Kelimpahan alaminya [0.7041, 0.7056].

Data nuklida

Unsur: Talium (Tl, Z = 81)
Nomor massa (A): 205
Proton (Z): 81
Neutron (N): 124
Massa atom: 204.974427318 ± 0.00000133 u
Waktu paruh: Stabil
Mode peluruhan: Tidak meluruh
Kelimpahan alami: [0.7041, 0.7056]
Tahun penemuan: 1931
Sumber data: IAEA Atomic Mass Data Center (NUBASE) and IUPAC CIAAW, via PubChem

Because molecules, atoms, and ions of the stable isotopes of thallium possess slightly different physical and chemical properties, they commonly will be fractionated during physical, chemical, and biological processes, giving rise to variations in isotopic abundances and in atomic weights. There are substantial variations in the isotopic abundances of thallium in natural terrestrial materials (Fig. IUPAC.81.1). These variations are useful in investigating the origin of substances and studying environmental, hydrological, and geological processes. The isotope-amount ratio n(205Tl)/n(203Tl) has been used to study how trace metals are transported and distributed in hydrothermal fluids. The n(205Tl)/n(203Tl) ratio has also been used to study the cycling, distribution, and behavior of thallium in the marine environment.
203Tl is used in the production of 201Tl via the 203Tl (p, 3 n) 201Pb reaction, which is followed by a subsequent electron capture decay reaction of 201Pb to finally yield 201Tl. 205Tl is used as an alternative target in the production of 201Tl.