Uranium-234m

Properties and data of the isotope ²³⁴U.

Content

General data

Name of the isotope:Uranium-234m; U-234mSymbol:²³⁴U or 23492UMass number A:234 (= number of nucleons)Atomic number Z:92 (= number of protons)Neutrons N:142Isotopic mass:234.04095(2) u (atomic weight of Uranium-234m)
Excitation energy: 1421.257(17) keVNuclide mass:233.9904873 u (calculated nuclear mass without electrons)Mass excess:38.14468 MeVMass defect:1.909371016 u (per nucleus)Nuclear binding energy:1778.56764518 MeV (per nucleus)
7.60071643 MeV (average binding energy per nucleon)Half-life:33.5(20) μsDecay constant λ:20690.96061373 s^-1Specific activity α:5.324952108687 × 10⁺²⁵ Bq g^-1
1.439176245591 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)6-

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
²³⁴U		2.455(6) × 10⁵ a	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 142) and isobaric (same nucleon number A = 234) with Uranium-234m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 142	Isobar A = 234
84	²²⁶Po
85	²²⁷At
86	²²⁸Rn
87	²²⁹Fr
88	²³⁰Ra	²³⁴Ra
89	²³¹Ac	²³⁴Ac
90	²³²Th	²³⁴Th
91	²³³Pa	²³⁴Pa
92	²³⁴U	²³⁴U
93	²³⁵Np	²³⁴Np
94	²³⁶Pu	²³⁴Pu
95	²³⁷Am	²³⁴Am
96	²³⁸Cm	²³⁴Cm
97	²³⁹Bk	²³⁴Bk
98	²⁴⁰Cf
99	²⁴¹Es
100	²⁴²Fm