1, the harm to the central nervous system
The nervous system is very sensitive to radiation. After repeated low-intensity radiation, the function of the central nervous system changes, resulting in neurasthenia syndrome, mainly manifested as headache, dizziness, fatigue, memory loss, sleep disorder (insomnia, dreaminess or lethargy), daytime dozing, irritability, sweating, palpitation, chest tightness, hair loss and so on. , especially difficulty falling asleep, fatigue, sweating, and memory loss. The coordination between hand and brain is poor, which is characterized by slow speed of marking numbers and many mistakes;
2, the harm to the immune function of the body
The body's resistance is decreased. Animal experiments and the investigation of radiation effects on people show that the percentage and quantity of bacteria phagocytized by white blood cells in human body are decreased, and the formation of antibodies in people exposed to radiation for a long time is obviously inhibited.
3. Effects on cardiovascular system
People exposed to radiation often have hemodynamic imbalance, vascular permeability and tension decrease. Because the autonomic nerve regulation function is affected, people often show bradycardia, and a few people show tachycardia. The victim's blood pressure fluctuates, starts to rise, then returns to normal, and finally the blood pressure is low. The decrease of RT wave voltage in ECG is the result of vagus nerve allergic reaction and myocardial malnutrition. PQ is prolonged and P wave is widened, which indicates that atrioventricular conduction is poor. In addition, people who are exposed to radiation for a long time will have cardiovascular diseases earlier and easier to promote their occurrence and development.
4. Influence on blood system
Under the radiation, the peripheral hemogram may appear leucocyte instability, mainly the downward trend, leucopenia, inhibition of erythropoiesis and reticular erythropenia. The health survey results of people who operate radar show that most people have leukopenia. In addition, when radio waves and radiation act on the human body at the same time, the impact on the blood system can be more obvious than a single factor.
5. Effects on reproductive system and heredity.
People who have been exposed to ultrashort wave generators for a long time may have male sexual dysfunction and impotence; Women's menstrual cycle is disordered, because testicular blood circulation is not smooth, they are very sensitive to radiation, and sperm production is inhibited, which affects fertility; It denatures the egg cells, destroys the ovulation process and makes women lose their fertility.
High-intensity radiation can produce genetic effects, leading to chromosome aberration and abnormal mitosis in testis. Pregnant women receive short-wave diathermy treatment in the early stage or before pregnancy, which leads to congenital birth defects (deformed babies) in their offspring.
6, the impact on the visual system
Eye tissue contains a lot of water, which is easy to absorb radiation and has small blood flow. Therefore, under radiation, the temperature of eyeball is easy to rise, which is the main condition of cataract. The increase in temperature leads to protein condensation of the lens of the eye. Most scholars believe that the long-term effect of low-intensity microwave can accelerate the aging and opacity of lens, and may shorten the colored field of vision and prolong the dark adaptation time, resulting in some visual obstacles. In addition, the long-term effects of low-intensity radiation may
7. Carcinogenesis and electromagnetic radiation carcinogenesis
Most experimental animals are exposed to microwaves, which will increase the incidence of cancer. Some experiments by microwave biologists show that radiation can cause mutation and mitosis abnormality of chromosomes and microparticle cells in human body, thus causing pathological proliferation of some tissues and turning normal cells into cancer cells. The high radiation emitted by an American embassy abroad for a long time leads to an increase in the white blood cell count of embassy staff. In areas where the incidence of cancer is higher than that of normal people, or under the influence of high-power long-range microwave radar, the number of local cancer patients has increased sharply. The thermal effect of microwave on human tissues can be used not only for physical therapy, but also for treating cancer, raising the central temperature of cancer tissues and destroying the proliferation of cancer cells.
In addition to the health hazards mentioned above, radiation also has adverse effects on endocrine system, hearing, substance metabolism and morphological changes of tissues and organs.
Definition of radiation:
Radiation refers to the outward diffusion of energy in the form of electromagnetic waves or particles (such as alpha particles and beta particles). All objects in nature always transfer heat in the form of electromagnetic waves and particles as long as the temperature is above absolute zero. This way of transmitting energy is called radiation.
Radiation principle:
Radiation is the transmission of energy in the form of waves or subatomic particle motion. Radiation energy radiates linearly in all directions from a radiation source. Radiation is emitted in the form of electromagnetic waves and particles (such as alpha particles and beta particles). Radio waves and light waves are electromagnetic waves. Their propagation speed is very fast, and the propagation speed in vacuum is the same as that of light waves (3×10.8 m/s).
Main types:
Generally, it can be divided into ionizing radiation and non-ionizing radiation according to its energy level and the ability of ionizing substances. This term is usually used for ionizing radiation. Ionizing radiation has enough energy to ionize atoms or molecules, but non-ionizing radiation does not. Radioactive substances refer to substances that can emit ionizing radiation. There are three main types of ionizing radiation: α, β and γ radiation (or rays).
1, ionizing radiation
Radiation with high enough energy can ionize atoms. Generally speaking, ionization means that electrons are knocked out of the electron layer by ionizing radiation, making atoms positively charged. Because cells are made of atoms, ionization can cause cancer. A cell consists of trillions of atoms. The probability that ionizing radiation causes cancer depends on the radiation dose rate and the sensitivity of the organism receiving radiation. Alpha, beta, gamma radiation and neutron radiation can all be accelerated to high enough energy to ionize atoms.
2, non ionizing radiation
The energy of non-ionizing radiation is weaker than ionizing radiation. Non-ionizing radiation will not ionize substances, but will change the rotation, vibration or valence electron orbital state of molecules or atoms. The effects of non-ionizing radiation on living tissues have not been studied for a long time. Different non-ionizing radiation will produce different biological effects.