Microwave doors block radiation using a metal mesh with holes smaller than the wavelength of microwaves, but larger than visible light waves.
The metal mesh in a microwave door acts as a Faraday cage for microwave radiation. Microwaves have a relatively long wavelength, typically around 12 cm. The holes in the mesh are significantly smaller than this wavelength, preventing the microwaves from passing through and escaping the oven. However, visible light has a much shorter wavelength, on the order of nanometers, allowing it to easily pass through the same holes, which is why you can see inside the microwave.
While microwave doors are designed to contain radiation, it's always wise to ensure your appliance is in good condition and not damaged.
Where can I get a microwave leak detector tool?
Microwave leak detector tools can be purchased from various online retailers, such as Amazon, eBay, or specialized electronics supply stores. Some larger electronics or appliance parts stores might also carry them. When purchasing, look for tools that specify their sensitivity range and are designed for home use. While these tools can provide an indication of potential leaks, remember that they are not always perfectly accurate, and professional testing is recommended for definitive safety assessments.