Periodic Table/Thorium/²²²Th

← 221Th223Th →

²²²Th

Thorium-222

Radioactive· Half-life: 2.24 ms

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

90

Neutrons (N)

132

Mass Number (A)

222

Atomic Mass

222.018468AMU

Spin / Parity

0+

Binding E/A

7.470keV

Natural Abundance

Trace / None

Half-life

2.24 ms

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

α

100.0%

EC

Decay Chain

²²²ThThorium2.24 ms

α100.0%

EC²²²Ac

²¹⁸RaRadium25.9 μs

α100.0%

²¹⁴RnRadon259 ns

α100.0%

²¹⁰PoPolonium138 d

α100.0%

²⁰⁶PbLeadSTABLE

5-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