Nuklida · stabil · alami

Silikon-30 (³⁰Si)

Silikon-30 (³⁰Si) adalah isotop stabil silikon dengan 14 proton dan 16 neutron (nomor massa 30). Kelimpahan alaminya [0.030 37, 0.031 10].

Data nuklida

Unsur: Silikon (Si, Z = 14)
Nomor massa (A): 30
Proton (Z): 14
Neutron (N): 16
Massa atom: 29.973770137 ± 0.000000023 u
Waktu paruh: Stabil
Mode peluruhan: Tidak meluruh
Kelimpahan alami: [0.030 37, 0.031 10]
Tahun penemuan: 1924
Sumber data: IAEA Atomic Mass Data Center (NUBASE) and IUPAC CIAAW, via PubChem

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).