Nuklida · radioaktif
Argon-37 (³⁷Ar)
Argon-37 (³⁷Ar) adalah isotop radioaktif argon dengan 18 proton dan 19 neutron (nomor massa 37). Waktu paruhnya 35,011 hari (± 0,019 hari), meluruh terutama lewat penangkapan elektron (ε).
Data nuklida
- Unsur
- Argon (Ar, Z = 18)
- Nomor massa (A)
- 37
- Proton (Z)
- 18
- Neutron (N)
- 19
- Massa atom
- 36.966776301 ± 0.000000221 u
- Waktu paruh
- 35,011 hari (± 0,019 hari)
- Mode peluruhan
- Penangkapan elektron (ε) ( 100 %)
- Inti anak
- Klorin-37 (³⁷Cl)
- Tahun penemuan
- 1941
- Sumber data
- IAEA Atomic Mass Data Center (NUBASE) and IUPAC CIAAW, via PubChem
Kegunaan isotop argon
- Argon isotopes are used to date rock samples, especially volcanic rocks, using two related techniques (Fig. IUPAC.18.1),,,. –The first technique is potassium-argon dating (K-Ar), which is based on the decay of radioactive 40K to stable 40Ar. By comparing the concentrations of potassium and 40Ar in a sample, it is possible to determine how long the sample has been accumulating radiogenic 40Ar to determine the “age” of the sample. The half-life of 40K is approximately 1.25×109 years, making this a useful tool for dating rocks range in age from about 106 to 109 years. –A modification of the potassium-argon dating technique is the n(40Ar)/n(39Ar) isotope-amount-ratio technique, in which a sample is irradiated in a nuclear reactor to produce 39Ar from 39K. The isotope-amount ratio n(40Ar)/n(39Ar) is then determined, and from this, the approximate age of the rock can be calculated (Fig. IUPAC.18.2). The study of 37Ar (half-life of 35 days), 39Ar (half-life of 268 years), and 40Ar concentrations in groundwater can provide information about the production and release of these isotopes from rocks and other sources into groundwater and the relative ages of different groundwaters,,,,,.
Isotop argon lainnya
²⁹Ar, ³⁰Ar, ³¹Ar, ³²Ar, ³³Ar, ³⁴Ar, ³⁵Ar, ³⁶Ar, ³⁸Ar, ³⁹Ar, ⁴⁰Ar, ⁴¹Ar, ⁴²Ar, ⁴³Ar, ⁴⁴Ar, ⁴⁵Ar, ⁴⁶Ar, ⁴⁷Ar, ⁴⁸Ar, ⁴⁹Ar, ⁵⁰Ar, ⁵¹Ar, ⁵²Ar, ⁵³Ar, ⁵⁴Ar