Nuclides with atomic number of 27 but with different mass numbers
Isotopes of cobalt (27Co)
Main isotopes[1]
Decay
abundance
half-life (t1/2)
mode
product
56Co
synth
77.236 d
β+
56Fe
57Co
synth
271.811 d
ε
57Fe
58Co
synth
70.844 d
β+
58Fe
59Co
100%
stable
60Co
trace
5.2714 y
β−100%
60Ni
Standard atomic weight Ar°(Co)
58.933194±0.000003[2]
58.933±0.001 (abridged)[3]
view
talk
edit
Naturally occurring cobalt, Co, consists of a single stable isotope, 59Co (thus, cobalt is a mononuclidic element). Twenty-eight radioisotopes have been characterized; the most stable are 60Co with a half-life of 5.2714 years, 57Co (271.8 days), 56Co (77.27 days), and 58Co (70.86 days). All other isotopes have half-lives of less than 18 hours and most of these have half-lives of less than 1 second. This element also has 11 meta states, all of which have half-lives of less than 15 minutes.
The isotopes of cobalt range in atomic weight from 47Co to 75Co. The main decay mode for isotopes with atomic mass less than that of the stable isotope, 59Co, is electron capture and the main mode of decay for those of greater than 59 atomic mass units is beta decay. The main decay products before 59Co are iron isotopes and the main products after are nickel isotopes.
Radioisotopes can be produced by various nuclear reactions. For example, 57Co is produced by cyclotron irradiation of iron. The main reaction is the (d,n) reaction 56Fe + 2H → n + 57Co.[4]
^Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
^"Standard Atomic Weights: Cobalt". CIAAW. 2017.
^Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
^Diaz, L. E. "Cobalt-57: Production". JPNM Physics Isotopes. University of Harvard. Archived from the original on 2000-10-31. Retrieved 2013-11-15.
and 22 Related for: Isotopes of cobalt information
Naturally occurring cobalt, Co, consists of a single stable isotope, 59Co (thus, cobalt is a mononuclidic element). Twenty-eight radioisotopes have been...
products below 59Co are element 26 (iron) isotopes; above that the decay products are element 28 (nickel) isotopes. Cobalt compounds have been used for centuries...
A cobalt bomb is a type of "salted bomb": a nuclear weapon designed to produce enhanced amounts of radioactive fallout, intended to contaminate a large...
Research Council (NRC) of Canada asking it to produce cobalt-60 isotopes for use in a cobalt therapy unit prototype. Two cobalt-60 apparatuses were then...
include beta decay from cobalt-64, and electron capture from copper-64. Nickel-78 is one of the element's heaviest known isotopes. With 28 protons and 50...
11 have 5 stable isotopes, 9 have 4 stable isotopes, 5 have 3 stable isotopes, 16 have 2 stable isotopes, and 26 have 1 stable isotope. Additionally, about...
consists of four stable isotopes: 5.845% of 54Fe (possibly radioactive with a half-life over 4.4×1020 years), 91.754% of 56Fe, 2.119% of 57Fe and 0.286% of 58Fe...
half-life of about 5.27 years, and due to the availability ofcobalt-59 (100% of its natural abundance), this neutron bombarded isotopeofcobalt is a valuable...
alignment. Cobalt-60 is an unstable isotopeofcobalt that decays by beta decay to the stable isotope nickel-60 (60Ni). During this decay, one of the neutrons...
elements, they are usually termed stable isotopes. The 80 elements with one or more stable isotopes comprise a total of 251 nuclides that have not been known...
the decay scheme of the radioactive cobaltisotopecobalt-60. 60Co decays by emitting an electron (beta decay) with a half-life of 5.272 years into an...
medical isotopes, used in medical imaging and radiopharmaceuticals, and for cobalt-60 sources and industrial food irradiators. The Nordion Gamma Centre of Excellence...
the isotope-processing facilities necessary to produce a large portion of the world's medical isotopes, especially molybdenum-99, medical cobalt-60, xenon-133...
is sufficient for high-threshold nuclear reactions. The induced isotopes include cobalt-60, 57 and 58, iron-59 and 55, manganese-54, zinc-65, yttrium-88...
consists of two stable isotopes: 181Ta (99.988%) and 180m Ta (0.012%). There are also 35 known artificial radioisotopes, the longest-lived of which are...
the body of the organism. Radioactive isotopes that have been suggested for salted bombs include gold-198, tantalum-182, zinc-65, and cobalt-60. Sodium-23...
in the decay chain of the primordial isotopes thorium-232, uranium-238, and uranium-235. Examples include the natural isotopesof polonium and radium...
so that cobalt-60 fallout is 8 times more intense than fission at 1 year and 150 times more intense at 5 years. The very long-lived isotopes produced...
numbering, is a group (column) of chemical elements in the d-block of the periodic table. Members of Group 9 include cobalt (Co), rhodium (Rh), iridium (Ir)...
isotope. Except for the isotopesof hydrogen (which differ greatly from each other in relative mass—enough to cause chemical effects), the isotopes of...
to the general worldwide lack of sufficient replacement medical isotope production capacity for several critical isotopes such as molybdenum-99). As the...
this discrepancy has been explained by the presence ofisotopes; the atomic mass of any isotope is very close to satisfying the whole number rule, with...
Global Information