Periodic Table/Polonium/²⁰⁹Po

← 208Po210Po →

²⁰⁹Po

Polonium-209

Radioactive· Half-life: 124 y

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

84

Neutrons (N)

125

Mass Number (A)

209

Atomic Mass

208.982430AMU

Spin / Parity

1/2-

Binding E/A

7.630keV

Natural Abundance

Trace / None

Half-life

124 y

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

α

99.5%

β⁺

0.5%

Decay Chain

²⁰⁹PoPolonium124 y

α99.5%

β⁺²⁰⁹Bi0.45%

²⁰⁵PbLead17.0 My

EC100.0%

²⁰⁵TlThalliumSTABLE

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

Other Isotopes of Polonium

186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227

← Back to PoloniumData: IAEA NDS · ENSDF