When a microwave oven is not in use and is properly functioning, it should not emit radiation. Microwave ovens are designed with safety mechanisms, such as interlock switches, that prevent the generation of microwave radiation when the door is open or not securely closed.
However, it's worth noting that microwave ovens can still emit low levels of non-ionizing radiation, such as electromagnetic fields (EMF), even when not actively heating food. These levels are typically very low and considered safe for human exposure. The levels of EMF decrease rapidly with distance, so simply being in the vicinity of a microwave oven that is not in use poses minimal risk.
If you have concerns about radiation emissions from your microwave oven, it is recommended to ensure that the appliance is properly maintained and functioning correctly. Additionally, following the manufacturer's guidelines for safe usage and keeping a reasonable distance from the appliance can help alleviate any potential concerns.