Periodic Table/Uranium/²³¹U

← 230U232U →

²³¹U

Uranium-231

Radioactive· Half-life: 4.20 d

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

92

Neutrons (N)

139

Mass Number (A)

231

Atomic Mass

231.036292AMU

Spin / Parity

5/2+

Binding E/A

7.410keV

Natural Abundance

Trace / None

Half-life

4.20 d

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

EC

100.0%

α

0.0%

Decay Chain

²³¹UUranium4.20 d

EC100.0%

α²²⁷Th0.00%

²³¹PaProtactinium32.6 ky

α100.0%

24Ne²⁰⁷Tl13.4%

23F²⁰⁸Pb9.90%

²²⁷AcActinium21.8 y

β⁻98.6%

α²²³Fr1.38%

²²⁷ThThorium18.7 d

α100.0%

²²³RaRadium11.4 d

α100.0%

¹⁴C²⁰⁹Pb8.90%

²¹⁹RnRadon3.96 s

α100.0%

²¹⁵PoPolonium1.78 ms

α100.0%

β⁻²¹⁵At2.30%

²¹¹PbLead36.2 min

β⁻100.0%

²¹¹BiBismuth2.14 min

α100.0%

β⁻²¹¹Po0.28%

²⁰⁷TlThallium4.77 min

β⁻100.0%

²⁰⁷PbLeadSTABLE

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

Other Isotopes of Uranium

215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243

← Back to UraniumData: IAEA NDS · ENSDF