Strontium-90

Strontium-90 (90
Sr
) is a radioactive isotope of strontium produced by nuclear fission, with a half-life of 28.8 years. It undergoes β− decay into yttrium-90, with a decay energy of 0.546 MeV. Strontium-90 has applications in medicine and industry and is an isotope of concern in fallout from nuclear weapons, nuclear weapons testing, and nuclear accidents.

This article is about the chemical isotope. For the band, see Strontium 90 (band).
Strontium-90, 90Sr
Strontium-90 test source in tin
General
Symbol90Sr
Namesstrontium-90, 90Sr, Sr-90
Protons (Z)38
Neutrons (N)52
Nuclide data
Natural abundancesyn
Half-life (t1/2)28.79 years
Isotope mass89.9077279(16) Da
Decay products90Y
Decay modes
Decay modeDecay energy (MeV)
Beta decay0.546
Isotopes of strontium
Complete table of nuclides
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