Lantanum-138 (¹³⁸La)

Data nuklida

Unsur

Lantanum (La, Z = 57)

Nomor massa (A)

138

Proton (Z)

57

Neutron (N)

81

Massa atom

137.907124041 ± 0.000000446 u

Waktu paruh

103 miliar tahun (± 1 miliar tahun)

Mode peluruhan

Peluruhan beta plus (β⁺) ( 65,5 %), Peluruhan beta minus (β⁻) ( 34,5 %)

Inti anak

Barium-138 (¹³⁸Ba), Serium-138 (¹³⁸Ce)

Kelimpahan alami

0.000 8881(71)

Tahun penemuan

1947

Sumber data

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

Kegunaan isotop lantanum

• Studies have shown that 138La (with a half-life of 1.06×1011 years) can be used along with 138Ce and 136Ce to measure time elapsed from a supernova explosion producing large numbers of neutrinos.
• 138La decays to 138Ce and 138Ba, respectively, by beta decay with a half-life of 1.06×1011 years and by electron capture with a half-life of 1.56×1011 years. The isotope-amount ratio n(138Ce)/n(142Ce) has been used for dating rocks on long time scales (billions of years) and as a chemical tracer in geochemistry. The increase in radiogenic 138Ba in rocks enriched in rare earth elements, such as allanite, enables one to determine the age of such rocks (Fig. IUPAC.57.1).

Isotop lantanum lainnya

¹¹⁶La, ¹¹⁷La, ¹¹⁸La, ¹¹⁹La, ¹²⁰La, ¹²¹La, ¹²²La, ¹²³La, ¹²⁴La, ¹²⁵La, ¹²⁶La, ¹²⁷La, ¹²⁸La, ¹²⁹La, ¹³⁰La, ¹³¹La, ¹³²La, ¹³³La, ¹³⁴La, ¹³⁵La, ¹³⁶La, ¹³⁷La, ¹³⁹La, ¹⁴⁰La, ¹⁴¹La, ¹⁴²La, ¹⁴³La, ¹⁴⁴La, ¹⁴⁵La, ¹⁴⁶La, ¹⁴⁷La, ¹⁴⁸La, ¹⁴⁹La, ¹⁵⁰La, ¹⁵¹La, ¹⁵²La, ¹⁵³La, ¹⁵⁴La, ¹⁵⁵La, ¹⁵⁶La, ¹⁵⁷La

Pelajari

Kimia inti Simulasi peluruhan ¹³⁸La Bagan nuklida