Microwaves do not emit radiation when they are turned off but still plugged in. The electromagnetic radiation produced by a microwave oven is generated by the magnetron, a component within the oven that creates the microwaves used for heating food. When the microwave is in operation, the magnetron produces high-frequency electromagnetic waves, which are contained within the oven's metal casing and do not escape into the surrounding environment.
When you turn off the microwave, the magnetron stops producing microwaves, and there is no active radiation being emitted. However, it's important to note that even when a microwave oven is turned off, it may still have a small amount of residual radiation inside. This residual radiation is typically very low and poses no significant health risks.
To ensure maximum safety, it's recommended to follow the manufacturer's guidelines and avoid tampering with the internal components of a microwave oven. If you have concerns about radiation or the safety of your microwave, it's best to consult the manufacturer's instructions or contact the manufacturer directly for specific information about your model.