Periodic Table/Radium/²⁰³Ra

← 202Ra204Ra →

²⁰³Ra

Radium-203

Radioactive· Half-life: 36.0 ms

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

88

Neutrons (N)

115

Mass Number (A)

203

Atomic Mass

203.009234AMU

Spin / Parity

3/2-

Binding E/A

7.468keV

Natural Abundance

Trace / None

Half-life

36.0 ms

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

α

100.0%

β⁺

Decay Chain

²⁰³RaRadium36.0 ms

α100.0%

β⁺²⁰³Fr

¹⁹⁹RnRadon590 ms

α100.0%

β⁺¹⁹⁹At

¹⁹⁵PoPolonium4.64 s

α94.0%

β⁺¹⁹⁵Bi

¹⁹¹PbLead1.33 min

β⁺100.0%

α¹⁸⁷Hg0.51%

¹⁹¹TlThallium?

β⁺

¹⁹¹HgMercury49.0 min

β⁺100.0%

α¹⁸⁷Pt

¹⁹¹AuGold3.18 h

β⁺100.0%

¹⁹¹PtPlatinum2.83 d

EC100.0%

¹⁹¹IrIridiumSTABLE

9-step decay chain → stable · Primary path shown · branching ratios indicated

Other Isotopes of Radium

201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235

← Back to RadiumData: IAEA NDS · ENSDF