Periodic Table/Actinium/²²⁷Ac

← 226Ac228Ac →

²²⁷Ac

Actinium-227

Radioactive· Half-life: 21.8 y

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

89

Neutrons (N)

138

Mass Number (A)

227

Atomic Mass

227.027751AMU

Spin / Parity

3/2-

Binding E/A

7.450keV

Natural Abundance

Trace / None

Half-life

21.8 y

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

β⁻

98.6%

α

1.4%

Decay Chain

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

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