Microwave ovens are designed with safety mechanisms to prevent the release of microwave radiation when the door is opened. When you open the door of a microwave oven, a switch called the interlock switch is triggered, which immediately cuts off the power supply to the magnetron tube. This prevents the generation of microwave radiation.
Additionally, microwave ovens are equipped with a metal mesh screen on the door window. This screen acts as a barrier to contain the microwaves within the oven cavity while still allowing you to see inside. The mesh is designed to block and reflect microwave radiation, ensuring that it does not escape when the oven is in operation.
However, it's important to note that you should never tamper with the safety features of a microwave oven or attempt to bypass them. The interlock system and the door screen are crucial for preventing any potential exposure to microwave radiation. If you suspect that there is a malfunction with your microwave oven's safety mechanisms, it is recommended to have it inspected and repaired by a qualified technician.
In summary, opening the door of a microwave oven before the beep should not result in the release of deadly microwave radiation, as the safety mechanisms are designed to prevent such incidents.