Iodin-129 (¹²⁹I)

Data nuklida

Unsur

Iodin (I, Z = 53)

Nomor massa (A)

129

Proton (Z)

53

Neutron (N)

76

Massa atom

128.904983643 ± 0.000003385 u

Waktu paruh

16,14 juta tahun (± 0,12 juta tahun)

Mode peluruhan

Peluruhan beta minus (β⁻) ( 100 %)

Inti anak

Xenon-129 (¹²⁹Xe)

Tahun penemuan

1951

Sumber data

IAEA Atomic Mass Data Center (NUBASE) and IUPAC CIAAW, via PubChem

Kegunaan isotop iodin

• 131I (with a half-life of about 8 days) and 129I are both fission products; 129I is a long-lived fission product with a half-life of 1.7×107 years that can be helpful in the detection of the movement of radiation after a radioactive event, such as occurred at the Japanese reactors at Fukushima. In nuclear reactors and weapons tests, uranium and plutonium undergo fission processes in which one of the fission products is the long-lived isotope 129I. This isotope has been used as a groundwater tracer to determine evidence of nuclear fission, and it can also be tracked in rainwater as evidence of a fission event in the air (weapons explosion; Fig. IUPAC.53.1),,.
• Natural cosmogenic 129I enters groundwater and other terrestrial environments from the atmosphere and then decays to 129Xe. The isotope-amount ratio n(129I)/n(127I) can be used as a clock to estimate time since cosmogenic 129I entered the system. The amount of product 129Xe in such cases is too small to measure; however, excess quantities of 129Xe can be found in meteorites and other very old samples that contained extinct primordial 129I. Younger water bodies also can be differentiated from older water bodies by determining the amount of anthropogenic 129I released since the 1960s from sources such as nuclear bomb tests,.

Isotop iodin lainnya

¹⁰⁶I, ¹⁰⁷I, ¹⁰⁸I, ¹⁰⁹I, ¹¹⁰I, ¹¹¹I, ¹¹²I, ¹¹³I, ¹¹⁴I, ¹¹⁵I, ¹¹⁶I, ¹¹⁷I, ¹¹⁸I, ¹¹⁹I, ¹²⁰I, ¹²¹I, ¹²²I, ¹²³I, ¹²⁴I, ¹²⁵I, ¹²⁶I, ¹²⁷I, ¹²⁸I, ¹³⁰I, ¹³¹I, ¹³²I, ¹³³I, ¹³⁴I, ¹³⁵I, ¹³⁶I, ¹³⁷I, ¹³⁸I, ¹³⁹I, ¹⁴⁰I, ¹⁴¹I, ¹⁴²I, ¹⁴³I, ¹⁴⁴I, ¹⁴⁵I, ¹⁴⁶I, ¹⁴⁷I

Pelajari

Kimia inti Simulasi peluruhan ¹²⁹I Bagan nuklida