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          Harm of radiation to human body

          7/31/2014 8:31:51 (Views: 7/31/2014 8:31:51)

          The effects of radiation on the human body begin with cells. It can accelerate cell death, inhibit the generation of new cells, cause cell deformities, or cause changes in the biochemical response in the body. When the radiation dose is low, the human body has a certain ability to repair the radiation damage, and the above reactions can be repaired, so that it does not show harmful effects or symptoms. However, if the dose is too high, it can exceed the repairing ability of various organs or tissues in the human body, which will cause local or systemic lesions. The following table presents the biological effects of radiation currently recognized internationally. It can be seen that the human body can tolerate a concentrated exposure of 25 rem without suffering damage. Of course, each person's resistance and physical fitness are different.

          Possible effects of systemic exposure doses

          0-0.25 Hv without significant damage

          0.25-0.50 sv can cause changes in the blood, but without serious harm

          0.50-1.0 Shiv blood cells change and have some damage, but no fatigue

          1.0-2.0 sigma is injured and may feel general weakness

          2.0-4.0 Hif has injury, general weakness, and the frail may die

          4.0 Hif 50% fatal injury

          May cause death above 6.0 sv

          Radiation around us

          Speaking of radiation, people will be a little scared because it can't be seen or touched, but it will cause harm to the human body. In fact, radiation is not a rare thing. There is radiation everywhere. In our daily lives, we are exposed to some sun, watching TV, wearing a luminous watch, taking an airplane, taking X-rays, etc. However, the radiation in life is small, and it will not cause harm to the human body, so people do not feel its existence. A large amount of radiation is very harmful to the human body, so we should prevent and reduce the harm of radiation to our human body by taking some corresponding protective measures.

          Natural background irradiation

          Radioactivity exists everywhere in nature, and we have been receiving radiation with a natural background. The "background" of natural radiation has two sources: one is radiation in the form of high-energy particles, which comes from outer space, collectively known as cosmic rays; the other source is natural radioactivity, which is naturally present in ordinary substances such as air, water, soil And rocks, and even food). In addition, people in modern society are exposed to various artificial radiations, such as X-ray examinations, watching TV, and using microwave ovens. The following table lists the various background radiations by their size. It can be seen that humans will receive a small amount of radioactive radiation when eating, using, living and traveling.

          Source

          Living around a nuclear power plant about 0.0002 millisieverts per year

          About 0.005 millisievert per hour by plane

          Watching an hour of TV every day is about 0.001 millisievert per year

          Eat about 0.02 millisieverts per year

          Cosmic rays are about 0.03 millisieverts per year

          Earth and housing about 0.05 millisieverts per year

          Smoke 20 cigarettes per day about 0.038-0.075 millisieverts per year

          One X-ray examination about 0.50-2.0 millisieverts

          Natural irradiation in China's high background areas is 3.70 millisieverts per year

          Occupational dose limit for radioactive workers is 50 millisieverts per year

          Natural irradiation in the world's highest background area 120 mSv per year

          Living environment radiation

          The Indoor Environment Monitoring Center of the China Interior Decoration Association recently issued an environmental warning: when buying a house, you must pay attention to whether the electromagnetic radiation pollution in the community exceeds the standard. At present, many citizens have reported that the electromagnetic radiation pollution in their new residential quarters is very serious. Not only are the electrical appliances in their homes subject to excessive interference and cannot be used normally, but many people also experience discomfort to varying degrees. With the large-scale urban transformation and real estate development, some transmission and transmission centers and high-voltage lines that were originally built around the city also began to be developed and constructed, and the problems of electromagnetic radiation pollution in the community environment and indoor environment also came. These electromagnetic radiation are harmful to human body in six aspects. 1. It is likely to be one of the causes of leukemia in children. Medical research proves that long-term exposure to high electromagnetic radiation can cause changes in blood, lymph fluid and cellular protoplasm. After research by Italian experts, more than 400 children in the country develop leukemia every year. The main reason is that they are too close to the high-voltage power lines and suffer severe electromagnetic pollution. 2, can induce cancer and accelerate the proliferation of human cancer cells. Electromagnetic radiation pollution will affect the human body's circulatory system, immune, reproductive and metabolic functions, severely induce cancer, and accelerate human cancer cell proliferation. According to research data from Switzerland, household residents who pass through high-voltage lines are 7.4 times more likely to develop breast cancer than ordinary people. The Texas Cancer Medical Foundation's sampling test results for some patients suffering from electromagnetic radiation damage show that workers who work near high-voltage lines can grow cancer cells 24 times faster than the average person. 3. Affecting the human reproductive system, mainly manifested in the decrease of male sperm quality, spontaneous abortion and fetal malformation in pregnant women. 4, can cause children with intellectual disabilities. According to the latest survey, of the 20 million children born in China each year, 350,000 are deficient, of which 250,000 are intellectually disabled. Some experts believe that electromagnetic radiation is also one of the influencing factors. The World Health Organization believes that electromagnetic radiation from computers, televisions, and mobile phones can have adverse effects on the fetus. 5. Affect people's cardiovascular system, including palpitations, insomnia, some women's menstrual disorders, bradycardia, decreased blood volume, sinus arrhythmia, decreased white blood cells, decreased immune function, etc. If the pacemaker-equipped patient is exposed to high electromagnetic radiation, it will affect the normal use of the pacemaker. 6. It has bad effects on people's visual system. Because the eyes belong to the human body's sensitive organs to electromagnetic radiation, excessive electromagnetic radiation pollution can cause vision loss and cataracts. High-dose electromagnetic radiation will also affect and destroy the original biological current and biological magnetic field of the human body, making the original electromagnetic field in the human body abnormal. It is worth noting that different people or the same person's ability to withstand electromagnetic radiation at different ages is different. The elderly, children, and pregnant women are sensitive to electromagnetic radiation.

          Radiation knowledge and radiation around us

          Radiation is an energy that propagates in the form of an energy beam of waves, particles, or photons. Nuclear radiation is radiation from the nucleus of an atom. There are three main types of nuclear radiation that affect humans, namely alpha, beta, and gamma rays. Alpha rays are a stream of particles composed of nuclei of helium. It has a large mass and a large amount of charge, but has a weak ability to penetrate matter and a short range. It can be blocked by using only a piece of ordinary paper. However, if it enters the human body, it will cause harmful internal radiation, so it is necessary to prevent the alpha emitter from entering the human body. Beta rays are composed of high-speed electrons. Compared with alpha rays, it has greater penetrating power, can penetrate the stratum corneum of the skin and cause damage to living tissue, but it is easily shielded by materials such as plexiglass, plastic or aluminum plate. The harm of irradiation inside is less than that of alpha rays. Gamma rays are similar to X-rays and are also made up of invisible photons. Its penetrating power is the strongest, it can penetrate more than one meter thick concrete wall, a gamma ray with an energy of 1MeV is enough to penetrate the human body. Therefore, the protection of gamma rays is the most important in the protection of external radiation. However, because γ-rays are uncharged photons, they cannot directly cause ionization, so they do less harm to the human body than alpha and beta rays.

          Radioactivity is the inherent property of atoms that can spontaneously emit particles or electromagnetic waves. Nuclides that have the ability to emit particles or electromagnetic waves spontaneously are called radionuclides. To date, humans have discovered 109 elements and about 1,800 nuclides. Of the 109 elements, 92 exist in nature and 17 are artificially manufactured. Of the 1800 nuclides, only 270 are stable, and the remaining 1,500 or more are unstable and are radionuclides. It is not difficult to understand why our environment is full of various kinds of radiation.

          Radiation prevention

          There are 5 types of people who should pay special attention to electromagnetic radiation pollution: people who live and work near high-voltage lines, substations, radio stations, television stations, radar stations, electromagnetic wave transmission towers; people who often use computers, television electronics, medical equipment, office automation equipment; Workers living in the modern electrical automation environment; patients wearing pacemakers; pregnant women, children, the elderly and sick patients living in the above environment. If electromagnetic radiation pollution is high in the living environment, the public must take corresponding protective measures. Do not place appliances too centrally to avoid exposing yourself to the danger of overdose radiation. In particular, some household appliances that are prone to electromagnetic waves, such as radios, televisions, computers, refrigerators, etc., should not be placed in the bedroom. Various household appliances, office equipment, mobile phones, etc. should be avoided as long as possible, and multiple office and household appliances should be avoided at the same time. When the mobile phone is turned on, the maximum electromagnetic radiation is released. When using the mobile phone, the distance between the head and the mobile phone antenna should be as far as possible. It is best to use separate headphones and a microphone to answer the call. Pay attention to the distance between the human body and the office and household appliances. For the use of various electrical appliances, a certain safety distance should be maintained. The farther away from the electrical appliances, the less electromagnetic wave damage. For example, the distance between color TV and people should be 4 to 5 meters, and the distance from fluorescent tubes should be 2 to 3 meters. The microwave oven should be at least 1 meter away after being turned on. Pregnant women and children should stay away from the microwave oven as much as possible. Qualified units and individuals can be equipped with radiation-proof clothing, computers, TV radiation screens, radiation-proof curtains, radiation-proof glass and other measures to reduce electromagnetic radiation. Yes, it is not credible to be safe.

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