There is radiation, but it is very small and can be ignored.
There are many types of radiation, so don’t generalize them all. For example, the heater we use relies on infrared radiation, and nuclear explosions will produce nuclear radiation. It is the same radiation but its impact on the human body is different. There is also a health care product based on far infrared rays (such as thermal underwear, etc.).
So, ordinary electromagnetic radiation (visible light, infrared rays, electromagnetic waves used for various communications, electromagnetic waves generated by high-voltage electricity, and radiation generated by household appliances) are not terrible, and normal use will not cause any harm to health. Influence. However, radioactive radiation, X-rays (such as those used in taking films), and medical gamma knives and CTs that may be present in natural stones are all harmful to the human body.
Extended information:
Visible light also belongs to radiation, which can generally be classified as ionizing radiation or non-ionizing radiation according to its energy level and its ability to ionize substances. This term is generally used for ionizing radiation. Ionizing radiation has enough energy to ionize atoms or molecules, while non-ionizing radiation does not. Radioactive substances refer to substances that can emit ionizing radiation. There are three main types of ionizing radiation: alpha, beta and gamma radiation (or rays).
Generally speaking, when an object receives radiation (energy Q) from other objects, the part that is absorbed and converted into heat energy is QA, the part that is reflected is QR, and the part that passes through the object is QR. Part is QD. Obviously there is a relationship between these parts and the total energy as shown in the following formula:
QA+QR+QD=Q If A=QA/Q is called the absorption rate, R=QR/ Q is called the reflectivity, D=QD/Q is called the transmittance,
then there is: A+R+D=1 If the object’s A=1, R=D=0, it reaches the The energy of thermal radiation on the surface of an object is completely absorbed. This object is called an absolute black body, or black body for short.
If R=1, A=D=0, that is, all the energy of thermal radiation reaching the surface of the object is reflected;
When this reflection is regular, the object is called It is a mirror body; if it is random reflection, it is called an absolute white body.
If D=1, A=R=0, that is, all the energy of thermal radiation reaching the surface of the object passes through the object, and the object is called a heat transmitter.
In fact, there are no absolute black bodies and absolute white bodies, only some objects are close to absolute black bodies or absolute white bodies.
Reference: Baidu Encyclopedia - Radiation