Do microwave ovens make food radioactive or expose users to ionizing radiation?
Microwave ovens use radiofrequency electromagnetic radiation to heat food, but microwaves are non-ionizing: their photons do not carry enough energy to ionize atoms in the way X-rays or gamma rays can. Absorbed microwave energy becomes heat and does not make food radioactive. High microwave exposure can injure tissue through heating, which is why ovens are shielded, interlocked and subject to leakage limits; a damaged oven should not be treated as equivalent to normal operation.