The story you mentioned about the invention of the microwave oven is a common misconception. The microwave oven was not invented by discovering a melted chocolate bar on a person after working in a radiation area. This is an urban legend that has been circulated for many years but lacks factual basis.
The microwave oven was actually invented by Percy Spencer, an engineer at the Raytheon Corporation, in the 1940s. While working on radar technology during World War II, Spencer noticed that a candy bar in his pocket had melted when he was near an active magnetron, which is a component of radar systems. This observation led him to investigate the phenomenon further and eventually develop the microwave oven.
It's important to note that microwave ovens use microwave radiation to generate heat, but the radiation they emit is non-ionizing and is generally considered safe for humans when used properly. The microwaves are designed to be contained within the oven, and the oven's construction prevents leakage of radiation. Therefore, using a microwave oven according to the manufacturer's instructions poses no risk of harm to the body from the radiation.
In summary, the invention of the microwave oven was not based on a melted chocolate bar discovered on a person, and the radiation emitted by a properly functioning microwave oven is not harmful to the body when used correctly.