257Fm. Isotop von Fermium. Halbwertszeit: 8,7 d. Zerfallsreihe.

257FmFermium-257
Allgemein
NameFermium-257
Symbol257Fm
Massenzahl257
ElementFermium
natürliche Häufigkeitsyn.
Halbwertszeit8,7 d
Anzahl der Zerfallsprodukte2
Zerfallsprodukte257Fm → 253Cf, ZA: α (≈ 100 %), ZE: 6,864 MeV
257Fm → (–), ZA: SF (0,210 %), ZE: 0 MeV
Zerfallsreihe
257Fm
α SF
253Cf
β- α
253Es
α SF
249Bk
β- α
249Cf
α SF
245Cm
α SF
241Pu
β-α SF
241Am
α SF
237Np
α
233Pa
β-
233U
α SF 24Ne
229Th
α
225Ra
β-
225Ac
α
221Fr
(–)
209Pb
β-
209Bi
α
205Tl
(–)
237U
β-
237Np
α
233Pa
β-
233U
α SF 24Ne
229Th
α
225Ra
β-
225Ac
α
221Fr
(–)
209Pb
β-
209Bi
α
205Tl
(–)
(–)
(–)
245Am
(–)
249Cm
β-
249Bk
β- α
249Cf
α SF
245Cm
α SF
241Pu
β-α SF
241Am
α SF
237Np
α
233Pa
β-
233U
α SF 24Ne
229Th
α
225Ra
β-
225Ac
α
221Fr
(–)
209Pb
β-
209Bi
α
205Tl
(–)
237U
β-
237Np
α
233Pa
β-
233U
α SF 24Ne
229Th
α
225Ra
β-
225Ac
α
221Fr
(–)
209Pb
β-
209Bi
α
205Tl
(–)
(–)
(–)
245Am
(–)