The substances in nature, whose temperature is above absolute zero, are constantly transmitting heat outward in the form of electromagnetic waves, and this way of transmitting energy is called radiation. Radiation is everywhere, and in most cases does not pose a threat to human health. However, if you receive large doses of radiation for a long time, will bring harm to human health: 1, bones: can directly affect the growth process of bone development, leading to developmental deformities; 2, vision: can affect the development of vision, leading to vision loss, and even cause retinal detachment, cataracts, etc.; 3, fertility: excessive radiation may affect fertility, leading to miscarriage, infertility, abnormal fetus, etc.; can also make the quality of sperm decline, traits Change, and even lead to infertility; 4, other: long-term high dose radiation, can cause damage to the human circulatory system, nervous system, immune system, etc., may induce cardiovascular disease, diabetes and other more serious diseases, and even cancer.