All objects in nature, as long as the temperature is above absolute zero (-273. 15 degrees Celsius), constantly transfer heat in the form of electromagnetic waves and particles. This way of transmitting energy is called radiation. Light (visible light and invisible light) and heat are typical radiation.

Generally, this word is used in ionizing radiation, that is, high-energy radioactive radiation, such as hospital X-ray, gamma knife and nuclear radiation, so I feel very scared when I hear this word.

The light wave room is a 220V electrical appliance, which uses the principle of far infrared radiation, so the light wave room has radiation, but it is beneficial to the human body.

At present, it is zero radiation, which largely confuses the concepts of ionizing radiation and electromagnetic radiation. Daily electromagnetic radiation is said to be ionizing radiation harmful to human body, and most of them are this number. Roentgen is the commonly used unit of measurement of ionizing radiation in the world.