Nuclear radiation will cause serious harm to the natural environment and human health is beyond doubt, nuclear radiation due to the energy is strong, can destroy the chemical bonds of molecules in the body, resulting in changes in the nature of molecules, and nuclear radiation can break the body’s self-control system of replacement of old and new cells, so that the molecules can not be repaired by the destruction of the cell is still alive, and ultimately there will be the destruction of the cell uncontrolled replication of the situation, which is cancer. This is cancer. According to the mechanism of cancer caused by nuclear radiation, it is easy to see that people who have been exposed to nuclear radiation for a long time will have an increased possibility of developing cancer, and the cancers most likely to be caused by nuclear radiation include thyroid cancer, lymphoma and leukemia. First of all, as introduced on this website many times, the damage caused by nuclear radiation to the human body is ultimately deposited in the thyroid gland, so once exposed to nuclear radiation for a long period of time, the thyroid gland is the organ most likely to be harmed. In the nuclear leakage accident, the leakage of radioactive substances, radioactive iodine isotope iodine 131 accounted for a large proportion of the radioactive iodine isotope damage to the human thyroid and surrounding tissues have been introduced in detail, and thus the probability of exposure to nuclear radiation may be induced thyroid cancer is very high. Secondly, radioactive substance radiation can easily cause chromosomal changes in human lymphocytes. If lymphocytes are chronically damaged by nuclear radiation for a long period of time, the lymphocytes may, as mentioned above, have difficulty in repairing themselves and yet still survive, which has a high probability of triggering cancerous changes in the lymphocytes. In addition, the high-frequency microwaves and high-energy rays of nuclear radiation may lead to mutations in intracellular DNA sequences, in particular a sudden and dramatic increase in the number of white blood cells, leading to an imbalance in the body’s immune system and, ultimately, to leukemia.