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γ-ray spectrum of cobalt-60. Cobalt-60 (60 Co) is a synthetic radioactive isotope of cobalt with a half-life of 5.2714 years. [3] [4]: 39 It is produced artificially in nuclear reactors. Deliberate industrial production depends on neutron activation of bulk samples of the monoisotopic and mononuclidic cobalt isotope 59 Co. [5]
Gamma ray reduction techniques are especially useful for small lithium-doped germanium (Ge(Li)) detectors. Figure 2: Sodium iodide gamma spectrum of cobalt-60 (60 Co); see also a different measurement. The gamma spectrum shown in Figure 2 is of the cobalt isotope 60 Co, with two gamma rays with 1.17 MeV and 1.33 MeV respectively.
Cobalt-60, produced by neutron irradiation of ordinary cobalt metal in a reactor, is a high activity gamma-ray emitter, emitting 1.17 and 1.33 MeV gamma rays with an activity of 44 TBq/g (1,200 Ci/g). The main reason for its wide use in radiotherapy is that it has a longer half-life, 5.27 years, than many other gamma emitters. However, this ...
Cobalt-60 beam machine from 1951. Cobalt units use radiation from cobalt-60, which emits two gamma rays at energies of 1.17 and 1.33 MeV, a dichromatic beam with an average energy of 1.25 MeV. The role of the cobalt unit has largely been replaced by the linear accelerator, which can generate higher energy radiation.
In addition to their uses in radiography, both cobalt-60 (60 Co) and iridium-192 (192 Ir) are used in the radiotherapy of cancer. Cobalt-60 tends to be used in teletherapy units as a higher photon energy alternative to caesium-137, while iridium-192 tends to be used in a different mode of therapy, internal radiotherapy or brachytherapy.
It is useful for the Schilling test. [7] Cobalt-60 (60 Co or Co-60) is used in radiotherapy. It produces two gamma rays with energies of 1.17 MeV and 1.33 MeV. The 60 Co source is about 2 cm in diameter and as a result produces a geometric penumbra, making the edge of the radiation field fuzzy. The metal has the unfortunate habit of producing ...
Decay scheme of 60 Co. These relations can be quite complicated; a simple case is shown here: the decay scheme of the radioactive cobalt isotope cobalt-60. [1] 60 Co decays by emitting an electron with a half-life of 5.272 years into an excited state of 60 Ni, which then decays very fast to the ground state of 60 Ni, via two gamma decays.
Gamma-ray spectrometer. Spectrum of 60 Co; peaks at 1.17 and 1.33 MeV. A gamma-ray spectrometer (GRS) is an instrument for measuring the distribution (or spectrum —see figure) of the intensity of gamma radiation versus the energy of each photon. The study and analysis of gamma-ray spectra for scientific and technical use is called gamma ...