Cobalt-62m

Properties and data of the isotope ^62mCo.

Contents

General data

Name of the isotope:Cobalt-62m; Co-62mSymbol:^62mCo or 62m27CoMass number A:62 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:35Isotopic mass:61.934058(20) u (atomic weight of Cobalt-62m)
Excitation energy: 22(5) keVNuclide mass:61.9192467 u (calculated nuclear mass without electrons)Mass excess:-61.42458 MeVMass defect:0.580489924 u (per nucleus)Nuclear binding energy:540.72288127 MeV (per nucleus)
8.72133679 MeV (average binding energy per nucleon)Half-life:13.86(9) minDecay constant λ:0.00083351031813365 s^-1Specific activity α:8.228715645920 × 10⁺¹⁸ Bq g^-1
222397720.16002 Ci g^-1Spin and parity:
(nuclear angular momentum)(5)+

Radioactive Decay

Half-life T_½ = 13.86(9) min (minutes) respectively 8.316 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁶²Ni	> 99 %
Iso	⁶²Ni	< 1 %

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
⁶²Co		1.54(10) min	(2)+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 35) and isobaric (same nucleon number A = 62) with Cobalt-62m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 35	Isobar A = 62
18	⁵³Ar
19	⁵⁴K
20	⁵⁵Ca
21	⁵⁶Sc
22	⁵⁷Ti	⁶²Ti
23	⁵⁸V	⁶²V
24	⁵⁹Cr	⁶²Cr
25	⁶⁰Mn	⁶²Mn
26	⁶¹Fe	⁶²Fe
27	⁶²Co	⁶²Co
28	⁶³Ni	⁶²Ni
29	⁶⁴Cu	⁶²Cu
30	⁶⁵Zn	⁶²Zn
31	⁶⁶Ga	⁶²Ga
32	⁶⁷Ge	⁶²Ge
33	⁶⁸As	⁶²As
34	⁶⁹Se
35	⁷⁰Br
36	⁷¹Kr
37	⁷²Rb
38	⁷³Sr