Cobalt 60 machine8/3/2023 ![]() Through this note, these aspects are highlighted. A “true hazard evaluation” involves estimates of “annual personnel doses” received by the operators as well as “the likelihood of personnel exposures” the operator might be exposed to, in the event of “source stuck in ON position” may be objectively discussed. In these circumstances, to overcome the concern associated with technologists and administrators about the optimal use of telecobalt machines, it is felt that thorough understanding of the functional aspects of the available model cobalt machines is necessary. ![]() Linear accelerators generating megavoltage photons do not have radioactive sources, and there are no problems such as “source” in the “machine head” in “OFF” position or problems such as “source remaining stuck in ON position.” Everyone claims that linac should be the machine of choice because of no radiation hazards like “prevailing radiation levels during source “OFF” condition, and the fear associated with the high radiation levels if the teletherapy source stuck in “ON” position. Therefore, the mean activity encountered in these machines at any point of time range between 185–333 TBq (5000–9000 Ci). ![]() The cobalt-60 source decays at a rate of about 1% per month. An activity about 444 TBq (12,000 Ci) is loaded initially in these cobalt machines. In the advent of crisis globally in the management of cancer care, cobalt teletherapy machines have an edge over the linear accelerators because of less maintenance costs, less infrastructure requirements, low power demands, and simple quality assurance of the beam parameters. Radioactive cobalt-60 teletherapy machines still find a place in radiation therapy departments, in more populated and developing countries.
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