Periodic Table/Thorium/²²⁷Th

← 226Th228Th →

²²⁷Th

Thorium-227

Radioactive· Half-life: 18.7 d

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

90

Neutrons (N)

137

Mass Number (A)

227

Atomic Mass

227.027703AMU

Spin / Parity

1/2+

Binding E/A

7.445keV

Natural Abundance

Trace / None

Half-life

18.7 d

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

α

100.0%

Decay Chain

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

8-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