Cobalt-70m

Properties and data of the isotope ^70mCo.

Contents

See also: List of individual Cobalt isotopes (and general data sources).

General data

Name of the isotope:Cobalt-70m; Co-70mSymbol:^70mCo or 70m27CoMass number A:70 (= number of nucleons)Atomic number Z:27 (= number of protons)Neutrons N:43Isotopic mass:69.94994(32) u (atomic weight of Cobalt-70m)
Excitation energy: 200 keVNuclide mass:69.9351287 u (calculated nuclear mass without electrons)Mass excess:-46.63059 MeVMass defect:0.63392725200001 u (per nucleus)Nuclear binding energy:590.49943167 MeV (per nucleus)
8.43570617 MeV (average binding energy per nucleon)Half-life:0.47(5) sDecay constant λ:1.4747812352339 s^-1Specific activity α:1.28715077335 × 10⁺²² Bq g^-1
347878587394.05 Ci g^-1Spin and parity:
(nuclear angular momentum)(3+)

Radioactive Decay

Half-life T_½ = 0.47(5) s respectively 4.7 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁷⁰Ni	100 %	100 %

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
⁷⁰Co		112(7) ms	(6-,7-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 43) and isobaric (same nucleon number A = 70) with Cobalt-70m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 43	Isobar A = 70
22	⁶⁵Ti
23	⁶⁶V
24	⁶⁷Cr
25	⁶⁸Mn	⁷⁰Mn
26	⁶⁹Fe	⁷⁰Fe
27	⁷⁰Co	⁷⁰Co
28	⁷¹Ni	⁷⁰Ni
29	⁷²Cu	⁷⁰Cu
30	⁷³Zn	⁷⁰Zn
31	⁷⁴Ga	⁷⁰Ga
32	⁷⁵Ge	⁷⁰Ge
33	⁷⁶As	⁷⁰As
34	⁷⁷Se	⁷⁰Se
35	⁷⁸Br	⁷⁰Br
36	⁷⁹Kr	⁷⁰Kr
37	⁸⁰Rb
38	⁸¹Sr
39	⁸²Y
40	⁸³Zr
41	⁸⁴Nb
42	⁸⁵Mo
43	⁸⁶Tc
44	⁸⁷Ru