Periodic Table/Promethium/¹³⁹Pm

← 138Pm140Pm →

¹³⁹Pm

Promethium-139

Radioactive· Half-life: 4.15 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

61

Neutrons (N)

78

Mass Number (A)

139

Atomic Mass

138.916799AMU

Spin / Parity

5/2

Binding E/A

8.061keV

Natural Abundance

Trace / None

Half-life

4.15 min

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

β⁺

100.0%

Decay Chain

¹³⁹PmPromethium4.15 min

β⁺100.0%

¹³⁹NdNeodymium29.7 min

β⁺100.0%

¹³⁹PrPraseodymium4.41 h

β⁺100.0%

¹³⁹CeCerium138 d

EC100.0%

¹³⁹LaLanthanumSTABLE

5-step decay chain → stable · Primary path shown

Other Isotopes of Promethium

126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165

← Back to PromethiumData: IAEA NDS · ENSDF