Periodic Table/Thorium/²⁰⁹Th

← 208Th210Th →

²⁰⁹Th

Thorium-209

Radioactive

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

90

Neutrons (N)

119

Mass Number (A)

209

Atomic Mass

209.017601AMU

Spin / Parity

5/2-

Binding E/A

7.436keV

Natural Abundance

Trace / None

Half-life

Unknown

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

α

β⁺

Decay Chain

²⁰⁹ThThorium?

α

β⁺²⁰⁹Ac

²⁰⁵RaRadium220 ms

α100.0%

β⁺²⁰⁵Fr

²⁰¹RnRadon7.00 s

α

β⁺²⁰¹At

¹⁹⁷PoPolonium53.6 s

α44.0%

β⁺¹⁹⁷Bi

β⁺

¹⁹³TlThallium21.6 min

β⁺100.0%

¹⁹³HgMercury3.80 h

β⁺100.0%

¹⁹³AuGold17.6 h

β⁺100.0%

α¹⁸⁹Ir

¹⁹³PtPlatinum50.0 y

EC100.0%

¹⁹³IrIridiumSTABLE

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

Other Isotopes of Thorium

208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239

← Back to ThoriumData: IAEA NDS · ENSDF