cobalt 60

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 (Co) [ko´bawlt]
a chemical element, atomic number 27, atomic weight 58.933. (See Appendix 6.)
cobalt 57 a radioisotope of cobalt, atomic mass 57, having a half-life of 270 days; used as a label for cyanocobalamin. Symbol 57Co.
cobalt 60 a radioisotope of cobalt, atomic mass 60, having a half-life of 5.27 years and a principal gamma ray energy of 1.33 MeV; used as a radiation therapy source. Symbol 60Co.

co·balt 60 (60Co),

Half-life, 5.271 years; emits beta particles and energetic gamma rays, for which reason it is used in radiation teletherapy and diagnostics in place of radium, radon, or x-rays. It is also used as a diagnostic aid in the evaluation of vitamin B12 absorption.

co·balt 60

Radioactive isotope created by irradiating stable 59Co with neutrons in a reactor; has a mass number of 60; half-life 5.3 years; used in teletherapy and brachytherapy; emits beta particles and gamma-rays.
References in periodicals archive ?
Deepak was the first person to show symptoms of radiation poisoning after coming in contact with a radioactive waste, Cobalt 60, in his shop in Mayapuri last month.
The cobalt 60 was contained in thermal vessels that can withstand heat of up to 800 C and no radiation leakage was detected, company officials said.
According to government radioactive experts, the radioactive level of the cobalt 60 used at the factory is lower than that of radiation treatment for cancer.
Operating in a highly competitive market, its cobalt 60 therapy
reconstruction of irradiation and van emitters cobalt 60 and disposal of old lamps should take place in late october 2015 that the animals could be immediately initiated research work and the project susen device was put into operation by the end of 2015.
Isotope revenues reflected particular strength in the gamma sterilization business with strong sales of cobalt 60.
By using ordinary electricity, Titan's system provides a safer, more environmentally friendly alternative to the use of radioactive elements such as Cobalt 60 or Cesium 137.
Radioactive materials covered by this class include Iodine 131 in both Sodium Iodide and Monoiodobenzene forms, Cobalt 60, Carbon 14 and others.
SCE, the first case to be tried against SCE, which alleged that similar exposures to radiation and other emissions, such as Cobalt 60 particles and noble gases, resulted in her contracting myelogenous leukemia, first diagnosed in November 1992; that matter settled March 14, 1994, on the eve of retrial.