Periodic Table/Thulium/¹⁵⁵Tm

← 154Tm156Tm →

¹⁵⁵Tm

Thulium-155

Radioactive· Half-life: 21.6 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

69

Neutrons (N)

86

Mass Number (A)

155

Atomic Mass

154.939210AMU

Spin / Parity

11/2-

Binding E/A

7.861keV

Natural Abundance

Trace / None

Half-life

21.6 s

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

β⁺

99.2%

α

0.8%

Decay Chain

¹⁵⁵TmThulium21.6 s

β⁺99.2%

α¹⁵¹Ho0.83%

¹⁵⁵ErErbium5.30 min

β⁺100.0%

α¹⁵¹Dy0.02%

¹⁵⁵HoHolmium48.0 min

β⁺100.0%

¹⁵⁵DyDysprosium9.90 h

β⁺100.0%

¹⁵⁵TbTerbium5.32 d

EC100.0%

¹⁵⁵GdGadoliniumSTABLE

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

Other Isotopes of Thulium

144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182

← Back to ThuliumData: IAEA NDS · ENSDF