Periodic Table/Promethium/¹⁵⁵Pm

← 154Pm156Pm →

¹⁵⁵Pm

Promethium-155

Radioactive· Half-life: 41.5 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

61

Neutrons (N)

94

Mass Number (A)

155

Atomic Mass

154.928137AMU

Spin / Parity

5/2-

Binding E/A

7.994keV

Natural Abundance

Trace / None

Half-life

41.5 s

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

β⁻

100.0%

Decay Chain

¹⁵⁵PmPromethium41.5 s

β⁻100.0%

¹⁵⁵SmSamarium22.2 min

β⁻100.0%

¹⁵⁵EuEuropium4.74 y

β⁻100.0%

¹⁵⁵GdGadoliniumSTABLE

4-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