<Tr> <Td> β (beta decay) </Td> <Td> 0.31 MeV </Td> </Tr> <Tr> <Td> γ (gamma - rays) </Td> <Td> 1.1732, 1.3325 MeV </Td> </Tr> <P> Cobalt - 60, Co, is a synthetic radioactive isotope of cobalt with a half - life of 5.2714 years . It is produced artificially in nuclear reactors . Deliberate industrial production depends on neutron activation of bulk samples of the monoisotopic and mononuclidic cobalt isotope Co . Measurable quantities are also produced as a by - product of typical nuclear power plant operation and may be detected externally when leaks occur . In the latter case (in the absence of added cobalt) the incidentally produced Co is largely the result of multiple stages of neutron activation of iron isotopes in the reactor's steel structures via the creation of Co precursor . The simplest case of the latter would result from the activation of Fe . Co decays by beta decay to the stable isotope nickel - 60 (Ni). The activated nickel nucleus emits two gamma rays with energies of 1.17 and 1.33 MeV, hence the overall nuclear equation of the reaction is Co + n → Co → Ni + e + ν + gamma rays . </P> <P> Corresponding to its half - life the radioactive activity of one gram of Co is 44 T Bq (about 1100 curies). The absorbed dose constant is related to the decay energy and time . For Co it is equal to 0.35 mSv / (GBq h) at one meter from the source . This allows calculation of the equivalent dose, which depends on distance and activity . </P>

Where would a commercial quantity of cobalt-60 be produced
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