Americium-234

Properties and data of the isotope ²³⁴Am.

Content

General data

Name of the isotope:Americium-234; Am-234Symbol:²³⁴Am or 23495AmMass number A:234 (= number of nucleons)Atomic number Z:95 (= number of protons)Neutrons N:139Isotopic mass:234.04773(17) u (atomic weight of Americium-234)Nuclide mass:233.9956221 u (calculated nuclear mass without electrons)Mass excess:44.46021 MeVMass defect:1.900071364 u (per nucleus)Nuclear binding energy:1769.90507514 MeV (per nucleus)
7.5636969 MeV (average binding energy per nucleon)Separation energy:S_N = 6.87(19) MeV (first neutron)
S_P = 2.88(17) MeV (first proton)Half-life:2.32(8) minDecay constant λ:0.0049795056074709 s^-1Specific activity α:1.281507870984 × 10⁺¹⁹ Bq g^-1
346353478.64443 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1967

Radioactive Decay

Half-life T_½ = 2.32(8) min (minutes) respectively 1.392 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²³⁰Np	?	6.80(15) MeV
EE	²³⁴Pu	ca. 100 %	4.11(16) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 139) and isobaric (same nucleon number A = 234) with Americium-234. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 139	Isobar A = 234
83	²²²Bi
84	²²³Po
85	²²⁴At
86	²²⁵Rn
87	²²⁶Fr
88	²²⁷Ra	²³⁴Ra
89	²²⁸Ac	²³⁴Ac
90	²²⁹Th	²³⁴Th
91	²³⁰Pa	²³⁴Pa
92	²³¹U	²³⁴U
93	²³²Np	²³⁴Np
94	²³³Pu	²³⁴Pu
95	²³⁴Am	²³⁴Am
96	²³⁵Cm	²³⁴Cm
97	²³⁶Bk	²³⁴Bk
98	²³⁷Cf