Stronsium-87 (⁸⁷Sr)

Data nuklida

Unsur

Stronsium (Sr, Z = 38)

Nomor massa (A)

87

Proton (Z)

38

Neutron (N)

49

Massa atom

86.90887749454 ± 0.0000000055 u

Waktu paruh

Stabil

Mode peluruhan

Tidak meluruh

Kelimpahan alami

0.0700(20)

Tahun penemuan

1931

Sumber data

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

Kegunaan isotop stronsium

• Stable isotopic fractionation of strontium is small because the relative differences between the masses of strontium stable isotopes are small (mass numbers are 86, 87, and 88 for the most abundant stable isotopes). Also, strontium is not subject to reduction-oxidation reactions in normal terrestrial environments, which would cause isotopic fractionation to be more evident. Nevertheless, current studies are exploring potential applications of stable strontium isotopic fractionation; for example, it has been used as a proxy for temperature during coral growth and for insights into the diets of ancient populations,. The relative abundance of natural radiogenic 87Sr in seawater is related to the relative rates of processes that add or remove strontium in the ocean (seafloor spreading, mid-ocean-ridge hydrothermal activity, and continental weathering). Over geologic time, these processes have fluctuated and the isotope-amount ratio n(87Sr)/n(86Sr) has changed systematically. By measuring the n(87Sr)/n(86Sr) ratio in marine fossils of known age, it is possible to identify when such environmental changes occurred. Conversely, it is possible to estimate the ages of marine deposits by comparing measured n(87Sr)/n(86Sr) ratios with the global time chart; this process is known as strontium isotope stratigraphy.
• The isotope-amount ratio n(87Sr)/n(86Sr) is highly variable in rocks, minerals, soils, and waters, and it can be transmitted to plants (Fig. IUPAC.38.1), animals, and manufactured materials. Measurements of n(87Sr)/n(86Sr) ratios are used for forensic applications in food authentication (determining where food came from), archaeology, crime-scene investigation, and human migration,.
• The 87Rb- 87Sr dating technique utilizes the fact that 87Sr is a product of radioactive 87Rb decay (half-life of 4.97×1010 years) and is a useful tool for determining ages of rocks and minerals spanning the age of the Earth (Fig. IUPAC.38.2).

Isotop stronsium lainnya

⁷³Sr, ⁷⁴Sr, ⁷⁵Sr, ⁷⁶Sr, ⁷⁷Sr, ⁷⁸Sr, ⁷⁹Sr, ⁸⁰Sr, ⁸¹Sr, ⁸²Sr, ⁸³Sr, ⁸⁴Sr, ⁸⁵Sr, ⁸⁶Sr, ⁸⁸Sr, ⁸⁹Sr, ⁹⁰Sr, ⁹¹Sr, ⁹²Sr, ⁹³Sr, ⁹⁴Sr, ⁹⁵Sr, ⁹⁶Sr, ⁹⁷Sr, ⁹⁸Sr, ⁹⁹Sr, ¹⁰⁰Sr, ¹⁰¹Sr, ¹⁰²Sr, ¹⁰³Sr, ¹⁰⁴Sr, ¹⁰⁵Sr, ¹⁰⁶Sr, ¹⁰⁷Sr

Pelajari

Kimia inti Simulasi peluruhan ⁸⁷Sr Bagan nuklida