Periodic Table/Thorium/²²⁸Th

← 227Th229Th →

²²⁸Th

Thorium-228

Radioactive· Half-life: 1.91 y

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

90

Neutrons (N)

138

Mass Number (A)

228

Atomic Mass

228.028740AMU

Spin / Parity

0+

Binding E/A

7.443keV

Natural Abundance

Trace / None

Half-life

1.91 y

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

α

100.0%

20O

1.1%

Decay Chain

²²⁸ThThorium1.91 y

α100.0%

20O²⁰⁸Pb1.13%

²²⁴RaRadium3.63 d

α100.0%

¹⁴C²¹⁰Pb4.00%

²²⁰RnRadon55.6 s

α100.0%

2β⁻²²⁰Ra

²¹⁶PoPolonium144 ms

α100.0%

2β⁻²¹⁶Rn

²¹²PbLead10.6 h

β⁻100.0%

²¹²BiBismuth1.01 h

β⁻64.1%

α²⁰⁸Tl35.9%

β⁻α²⁰⁸Pb0.01%

²¹²PoPolonium294 ns

α100.0%

²⁰⁸PbLeadSTABLE

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