Periodic Table/Strontium/⁹⁹Sr

← 98Sr100Sr →

⁹⁹Sr

Strontium-99

Radioactive· Half-life: 269 ms

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

38

Neutrons (N)

61

Mass Number (A)

99

Atomic Mass

98.932884AMU

Spin / Parity

3/2+

Binding E/A

8.206keV

Natural Abundance

Trace / None

Half-life

269 ms

Decay Modesoverview · half-life · α · β⁻ · β⁺

β⁻

100.0%

β⁻n

0.1%

Decay Chain

⁹⁹SrStrontium269 ms

β⁻100.0%

β⁻n⁹⁸Y0.10%

⁹⁹YYttrium1.48 s

β⁻100.0%

β⁻n⁹⁸Zr1.77%

⁹⁹ZrZirconium2.10 s

β⁻100.0%

⁹⁹NbNiobium15.0 s

β⁻100.0%

⁹⁹MoMolybdenum2.75 d

β⁻100.0%

⁹⁹TcTechnetium211 ky

β⁻100.0%

⁹⁹RuRutheniumSTABLE

7-step decay chain → stable · Primary path shown · branching ratios indicated

Other Isotopes of Strontium

73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107

← Back to StrontiumData: IAEA NDS · ENSDF