Periodic Table/Actinium/²²⁵Ac

← 224Ac226Ac →

²²⁵Ac

Actinium-225

Radioactive· Half-life: 9.92 d

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

89

Neutrons (N)

136

Mass Number (A)

225

Atomic Mass

225.023229AMU

Spin / Parity

3/2-

Binding E/A

7.464keV

Natural Abundance

Trace / None

Half-life

9.92 d

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

α

100.0%

¹⁴C

5.3%

Decay Chain

²²⁵AcActinium9.92 d

α100.0%

¹⁴C²¹¹Bi5.30%

²²¹FrFrancium4.80 min

α100.0%

¹⁴C²⁰⁷Tl8.80%

β⁻²²¹Ra0.00%

²¹⁷AtAstatine32.6 ms

α100.0%

β⁻²¹⁷Rn0.01%

²¹³BiBismuth45.6 min

β⁻97.9%

α²⁰⁹Tl2.09%

²¹³PoPolonium3.71 μs

α100.0%

²⁰⁹PbLead3.23 h

β⁻100.0%

²⁰⁹BiBismuth20100000000 Gy

α100.0%

²⁰⁵TlThalliumSTABLE

8-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