No, a microwave oven should not leak radiation when it's not in use, assuming it is in good working condition. Microwave ovens are designed with safety measures to prevent any radiation leakage during their operation and when they are not actively cooking.
The primary safety feature in a microwave oven is the door's design, which includes a mesh or grid that blocks the microwave radiation from escaping. This mesh is known as the Faraday cage, and it traps the microwaves inside the oven while allowing visible light to pass through, allowing you to see your food cooking.
Microwave ovens are subject to strict safety regulations and testing to ensure they comply with safety standards and prevent any radiation leakage. Before a microwave oven is sold, it should undergo testing to ensure that it meets safety requirements and does not leak harmful radiation.
However, it's essential to maintain your microwave oven properly and inspect it for any signs of damage or wear. If you notice any issues with the door seal, such as visible damage or warping, it's best to have the oven inspected and repaired by a qualified technician.
Additionally, never attempt to tamper with the microwave oven's internal components or the door seals, as this could compromise its safety and lead to radiation leakage. Always follow the manufacturer's instructions for safe use and maintenance of your microwave oven.