Periodic Table/Thorium/²²⁵Th

← 224Th226Th →

²²⁵Th

Thorium-225

Radioactive· Half-life: 8.75 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

90

Neutrons (N)

135

Mass Number (A)

225

Atomic Mass

225.023951AMU

Spin / Parity

3/2+

Binding E/A

7.455keV

Natural Abundance

Trace / None

Half-life

8.75 min

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

α

90.0%

EC

Decay Chain

²²⁵ThThorium8.75 min

α90.0%

EC²²⁵Ac

²²¹RaRadium25.0 s

α100.0%

¹⁴C²⁰⁷Pb1.20%

²¹⁷RnRadon593 μs

α100.0%

²¹³PoPolonium3.71 μs

α100.0%

²⁰⁹PbLead3.23 h

β⁻100.0%

²⁰⁹BiBismuth20100000000 Gy

α100.0%

²⁰⁵TlThalliumSTABLE

7-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