Protaktinium-231 (²³¹Pa)

Data nuklida

Unsur

Protaktinium (Pa, Z = 91)

Nomor massa (A)

231

Proton (Z)

91

Neutron (N)

140

Massa atom

231.035882500 ± 0.000001901 u

Waktu paruh

32,65 ribu tahun (± 0,2 ribu tahun)

Mode peluruhan

Peluruhan alfa (α) ( 100 %)

Inti anak

Aktinium-227 (²²⁷Ac)

Kelimpahan alami

1

Tahun penemuan

1918

Sumber data

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

Kegunaan isotop protaktinium

• 231Pa (with a half-life of 3.25×104 years) and 230Th (with a half-life of 7.56×104 years) are produced in seawater by radioactive decay of 235U and 234U. The amount ratio of radioactive production of 231Pa and 230Th, n(231Pa)/n(230Th), is 0.093. 230Th is removed from seawater in settling particulates more efficiently than 231Pa, while 231Pa tends to be transported farther in ocean currents. Therefore, the amount ratio n(231Pa)/n(230Th) in settling particulates tends to be less than the production ratio of 0.093 unless the water mass is stationary and allows both products to settle out. Thus, sedimentary records of excess n(231Pa)/n(230Th) amount ratios can provide information for changes in the relative magnitude of major ocean circulation (Fig. IUPAC.91.1),.
• 231Pa is a natural radiogenic isotope produced by alpha decay of 235U to 231Th, followed by beta emission to form 231Pa. Although its behavior in the environment as a transient member of the U-series decay chain may be complex, measurements and modeling of 231Pa in relation to the isotopes of uranium and thorium have been used in a variety of geochronologic applications on time scales of 103 to 105 years,. Studies include movement of water masses and particles in the oceans, rates of magma melting and movement beneath volcanoes, and ages of carbonate mineral deposits, including corals, in relation to climate change.

Isotop protaktinium lainnya

²¹¹Pa, ²¹²Pa, ²¹³Pa, ²¹⁴Pa, ²¹⁵Pa, ²¹⁶Pa, ²¹⁷Pa, ²¹⁸Pa, ²¹⁹Pa, ²²⁰Pa, ²²¹Pa, ²²²Pa, ²²³Pa, ²²⁴Pa, ²²⁵Pa, ²²⁶Pa, ²²⁷Pa, ²²⁸Pa, ²²⁹Pa, ²³⁰Pa, ²³²Pa, ²³³Pa, ²³⁴Pa, ²³⁵Pa, ²³⁶Pa, ²³⁷Pa, ²³⁸Pa, ²³⁹Pa, ²⁴⁰Pa, ²⁴¹Pa

Pelajari

Kimia inti Simulasi peluruhan ²³¹Pa Bagan nuklida