Periodic Table/Thorium/²³⁸Th

← 237Th239Th →

²³⁸Th

Thorium-238

Radioactive· Half-life: 9.40 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

90

Neutrons (N)

148

Mass Number (A)

238

Atomic Mass

238.056388AMU

Spin / Parity

0+

Binding E/A

7.362keV

Natural Abundance

Trace / None

Half-life

9.40 min

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

β⁻

100.0%

Decay Chain

²³⁸ThThorium9.40 min

β⁻100.0%

²³⁸PaProtactinium2.28 min

β⁻100.0%

²³⁸UUranium4.46 Gy

α100.0%

2β⁻²³⁸Pu2.20%

²³⁴ThThorium24.1 d

β⁻100.0%

α²³⁰Ra

²³⁴PaProtactinium6.70 h

β⁻100.0%

²³⁴UUranium246 ky

α100.0%

26Ne²⁰⁸Pb9.00%

28Mg²⁰⁶Hg1.40%

²³⁰ThThorium75.4 ky

α100.0%

24Ne²⁰⁶Hg5.80%

²²⁶RaRadium1.60 ky

α100.0%

¹⁴C²¹²Pb2.60%

2β⁻²²⁶Th

²²²RnRadon3.82 d

α100.0%

²¹⁸PoPolonium3.10 min

α100.0%

β⁻²¹⁸At0.02%

²¹⁴PbLead27.1 min

β⁻100.0%

²¹⁴BiBismuth19.9 min

β⁻100.0%

α²¹⁰Tl0.02%

β⁻α²¹⁰Pb0.00%

²¹⁴PoPolonium163 μs

α100.0%

²¹⁰PbLead22.2 y

β⁻100.0%

α²⁰⁶Hg1.90%

²¹⁰BiBismuth5.01 d

β⁻100.0%

α²⁰⁶Tl13.2%

²¹⁰PoPolonium138 d

α100.0%

²⁰⁶PbLeadSTABLE

17-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