Nuklida · radioaktif · alami
Torium-232 (²³²Th)
Torium-232 (²³²Th) adalah isotop radioaktif torium dengan 90 proton dan 142 neutron (nomor massa 232). Waktu paruhnya 14 miliar tahun (± 0,1 miliar tahun), meluruh terutama lewat peluruhan alfa (α). Kelimpahan alaminya 0.9998(2).
Data nuklida
- Unsur
- Torium (Th, Z = 90)
- Nomor massa (A)
- 232
- Proton (Z)
- 90
- Neutron (N)
- 142
- Massa atom
- 232.038053606 ± 0.000001525 u
- Waktu paruh
- 14 miliar tahun (± 0,1 miliar tahun)
- Mode peluruhan
- Peluruhan alfa (α) ( 100 %), Peluruhan beta ganda
- Inti anak
- Radium-228 (²²⁸Ra), Uranium-232 (²³²U)
- Kelimpahan alami
- 0.9998(2)
- Tahun penemuan
- 1898
- Sumber data
- IAEA Atomic Mass Data Center (NUBASE) and IUPAC CIAAW, via PubChem
Kegunaan isotop torium
- The decay of 232Th (with a half-life of 1.40×1010 years) to 208Pb is used to date rocks based on the accumulation of the stable daughter product 208Pb. The half-lives of the isotopes between the parent radionuclide 232Th and stable endpoint 208Pb all have much shorter half-lives than thorium. Therefore, the amount of 208Pb that accumulates in a sample is determined primarily by the amount of 232Th parent radionuclide present when the mineral was formed and the time that has elapsed since the mineral solidified. Another dating method, the 230Th/ 234U method, is based on the hypothesis that the sample contains uranium, but no 230Th at the time of its formation. Then, the age of the specimen is determined mainly by the amount of 230Th in the specimen. Reliable ages with this method range from several thousand to approximately 350 thousand years.
Isotop torium lainnya
²⁰⁸Th, ²⁰⁹Th, ²¹⁰Th, ²¹¹Th, ²¹²Th, ²¹³Th, ²¹⁴Th, ²¹⁵Th, ²¹⁶Th, ²¹⁷Th, ²¹⁸Th, ²¹⁹Th, ²²⁰Th, ²²¹Th, ²²²Th, ²²³Th, ²²⁴Th, ²²⁵Th, ²²⁶Th, ²²⁷Th, ²²⁸Th, ²²⁹Th, ²³⁰Th, ²³¹Th, ²³³Th, ²³⁴Th, ²³⁵Th, ²³⁶Th, ²³⁷Th, ²³⁸Th, ²³⁹Th