There is no radistion to a microwave oven. Who in thiere wright mind would cook thiere food with radiation, we would all be walking around with three arms or a nose comming out of our neck. A microwave oven uses micro waves hence the name "microwave". The first one was developed by Raytheon corp and it was called a radar range. They were developed from radar waves after ww2 whe the microwaves hit the food in the oven at a high frequency the malicules start to move real fast at makes the food to heat up.