Cobalt-70

Properties and data of the isotope ⁷⁰Co.

Content

General data

Name of the isotope:Cobalt-70; Co-70Symbol:⁷⁰Co or 7027CoMass 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-70)Nuclide 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)Separation energy:S_N = 5.28(30) MeV (first neutron)
S_P = 14.89(50) MeV (first proton)Half-life:112(7) msDecay constant λ:6.1888141121424 s^-1Specific activity α:5.401436281055 × 10⁺²² Bq g^-1
1459847643528.6 Ci g^-1Spin and parity:
(nuclear angular momentum)(6-.7-)Year of discovery:1985

Radioactive Decay

Half-life T_½ = 112(7) ms respectively 1.12 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁷⁰Ni	100 %	12.58(39) MeV
β^-, n	⁶⁹Ni	?	5.28(30) MeV

Parent Nuclides

Direct parent isotope is: ⁷⁰Fe.

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
^70mCo	200 keV	0.47(5) s	(3+)

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-70. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 43	Isobar A = 70
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