Periodic Table/Fermium/²⁴¹Fm

242Fm →

²⁴¹Fm

Fermium-241

Radioactive· Half-life: 730 μs

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

100

Neutrons (N)

141

Mass Number (A)

241

Atomic Mass

241.074311AMU

Spin / Parity

5/2+

Binding E/A

7.247keV

Natural Abundance

Trace / None

Half-life

730 μs

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

SF

α

14.0%

β⁺

12.0%

Decay Chain

²⁴¹FmFermium730 μs

α14.0%

β⁺²⁴¹Es12.0%

²³⁷CfCalifornium800 ms

α70.0%

β⁺²³⁷Bk

²³³CmCurium27.0 s

β⁺80.0%

α²²⁹Pu20.0%

²³³AmAmericium3.20 min

α4.50%

β⁺²³³Pu

²²⁹NpNeptunium4.00 min

α68.0%

β⁺²²⁹U

²²⁵PaProtactinium1.71 s

α100.0%

²²¹AcActinium52.0 ms

α100.0%

²¹⁷FrFrancium22.0 μs

α100.0%

²¹³AtAstatine125 ns

α100.0%

²⁰⁹BiBismuth20100000000 Gy

α100.0%

²⁰⁵TlThalliumSTABLE

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

Other Isotopes of Fermium

241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260

← Back to FermiumData: IAEA NDS · ENSDF