Periodic Table/Actinium/²²⁶Ac

← 225Ac227Ac →

²²⁶Ac

Actinium-226

Radioactive· Half-life: 1.22 d

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

89

Neutrons (N)

137

Mass Number (A)

226

Atomic Mass

226.026097AMU

Spin / Parity

1-

Binding E/A

7.454keV

Natural Abundance

Trace / None

Half-life

1.22 d

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

β⁻

83.0%

EC

17.0%

α

0.0%

Decay Chain

²²⁶AcActinium1.22 d

β⁻83.0%

EC²²⁶Ra17.0%

α²²²Fr0.01%

²²⁶ThThorium30.7 min

α100.0%

18O²⁰⁸Pb3.20%

²²²RaRadium33.6 s

α100.0%

¹⁴C²⁰⁸Pb3.00%

²¹⁸RnRadon33.8 ms

α100.0%

²¹⁴PoPolonium163 μs

α100.0%

²¹⁰PbLead22.2 y

β⁻100.0%

α²⁰⁶Hg1.90%

²¹⁰BiBismuth5.01 d

β⁻100.0%

α²⁰⁶Tl13.2%

²¹⁰PoPolonium138 d

α100.0%

²⁰⁶PbLeadSTABLE

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

Other Isotopes of Actinium

205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237

← Back to ActiniumData: IAEA NDS · ENSDF