Is there radiation from a 60 Co machine when it is switched off?

The correct response is based on the presence of leakage radiation that may occur even when a cobalt-60 (Co-60) machine is not actively in use. Cobalt-60 machines, which are commonly utilized in radiation therapy, do emit some level of radiation due to potential leakage from the machine's components, especially if it is not properly shielded.

Leakage radiation can escape from the protective housing of the machine, leading to exposure outside of the intended target area. It is essential for facilities using such machines to ensure their equipment is well-maintained and shielded to minimize any unnecessary radiation exposure. Therefore, even when the machine is switched off, the possibility of leakage radiation remains a concern that practitioners must address to ensure safety protocols are followed.

In contrast, a fully powered-down machine theoretically stops producing therapeutic radiation, but safety measures regarding leakage must always be considered. The presence of leakage radiation underscores the importance of having regular safety checks and maintenance.