Periodic Table/Selenium/⁹¹Se

← 90Se92Se →

⁹¹Se

Selenium-91

Radioactive· Half-life: 270 ms

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

34

Neutrons (N)

57

Mass Number (A)

91

Atomic Mass

90.945700AMU

Spin / Parity

1/2+

Binding E/A

8.144keV

Natural Abundance

Trace / None

Half-life

270 ms

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

β⁻

100.0%

β⁻n

21.0%

2n

Decay Chain

⁹¹SeSelenium270 ms

β⁻100.0%

β⁻n⁹⁰Br21.0%

2n⁸⁹Se

⁹¹BrBromine543 ms

β⁻100.0%

β⁻n⁹⁰Kr29.5%

⁹¹KrKrypton8.57 s

β⁻100.0%

β⁻n⁹⁰Rb

⁹¹RbRubidium58.2 s

β⁻100.0%

β⁻n⁹⁰Sr

⁹¹SrStrontium9.65 h

β⁻100.0%

⁹¹YYttrium58.5 d

β⁻100.0%

⁹¹ZrZirconiumSTABLE

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

Other Isotopes of Selenium

63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95

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