Silikon-32 (³²Si)

Data nuklida

Unsur

Silikon (Si, Z = 14)

Nomor massa (A)

32

Proton (Z)

14

Neutron (N)

18

Massa atom

31.974151538 ± 0.00000032 u

Waktu paruh

157 tahun (± 7 tahun)

Mode peluruhan

Peluruhan beta minus (β⁻) ( 100 %)

Inti anak

Fosforus-32 (³²P)

Tahun penemuan

1953

Sumber data

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

Kegunaan isotop silikon

• Because molecules, atoms, and ions of the stable isotopes of silicon possess slightly different physical and chemical properties, they commonly will be fractionated during physical, chemical, and biological processes, giving rise to variations in isotopic abundances and in atomic weights. There are substantial variations in the isotopic abundances of silicon in natural terrestrial materials (Fig. IUPAC.14.1). These variations are useful in investigating the origin of substances and studying environmental, hydrological, and geological processes,. Diatoms, a major group of algae, need silicon to build up their opaline shells and prefer 28Si while taking up Si(OH)4, which is the biologically available form of silicon in the marine environment. This progressively enriches surface waters with 29Si and 30Si. 32Si-labeled silicic acid of high specific radioactivity is used to measure uptake rates of Si and estimate marine sedimentation of biogenic (created by living organisms) silica (by diatoms and sea shells). By performing uptake kinetic experiments, the 32Si activity can be measured as 32P using counting of Cherenkov radiation (radiation produced by charged particles passing through a medium at a speed greater than that of light through the same medium — after Soviet physicist Pavel A. Cherenkov) with a liquid scintillation analyzer (measuring ionizing radiation using the interaction of radiation on a material and counting the resulting photon emissions).
• Cosmogenic 32Si has a half-life of about 150 years and is produced by cosmic-ray spallation of argon in the stratosphere and troposphere. 32Si in dust is precipitated in snow, making it possible to date dust in snow and glacial ice (Fig. IUPAC.14.2). Glaciers are archives for global climate history because they contain a variety of proxies (imprints of past environmental conditions used to interpret paleoclimate) for climate forcing and climate response. Cosmogenic 32Si that is stored in glaciers and ice-core samples can be analyzed using accelerator mass spectrometry to date when sections of glaciers formed,.

Isotop silikon lainnya

²²Si, ²³Si, ²⁴Si, ²⁵Si, ²⁶Si, ²⁷Si, ²⁸Si, ²⁹Si, ³⁰Si, ³¹Si, ³³Si, ³⁴Si, ³⁵Si, ³⁶Si, ³⁷Si, ³⁸Si, ³⁹Si, ⁴⁰Si, ⁴¹Si, ⁴²Si, ⁴³Si, ⁴⁴Si, ⁴⁵Si

Pelajari

Kimia inti Simulasi peluruhan ³²Si Bagan nuklida