Definition of radiation
All objects in nature, as long as the temperature in the absolute temperature of zero degrees above, are in the form of electromagnetic waves at all times non-stop outward transmission of heat, this way of transmitting energy is called radiation. Objects through the radiation of the energy released, known as radiant energy, referred to as radiation.
Radiation has an important characteristic, is that it is "reciprocal". Regardless of the temperature of the object (gas) are radiated outward, the object A can be radiated to the object B, at the same time B can also be radiated to A. This is different from conduction. This is different from conduction, which is unidirectional.
Radiation energy is absorbed by the body when the thermal effect occurs, the object absorbs different radiation energy, the resulting temperature is different. Therefore, radiation is an important way to convert energy into heat.
Radiation is in the form of electromagnetic waves outward dispersion. It is spreading energy in the form of fluctuations. Radio waves and light waves are electromagnetic waves. They travel very fast, the same speed as light waves (3 x 1010 cm/sec) in a vacuum and slightly slower in air.
Electromagnetic waves are synthetic waves composed of waves of different wavelengths. Its wavelength ranges from cosmic rays of 10E-10 microns (1 micron = 10E-4 cm) to radio waves with wavelengths up to several kilometers.Υ rays, X-rays, ultraviolet, visible light, infrared, ultra-shortwave and long-wave radio waves all belong to the range of electromagnetic waves. What is visible to the naked eye is a very short section of electromagnetic waves, from 0.4-0.76 micrometers this part is called visible light. Visible light by the prism after spectroscopy, become a band of red, orange, yellow, green, cyan, blue, purple seven colors, which is called the light band spectrum. The longest wavelength of red light, violet wavelength is the shortest, the wavelength of the other colors of light is in between. Wavelength longer than red light (& gt; 0.76 microns) have infrared radio waves; wavelength shorter than the violet light (& lt; 0.4 microns) have ultraviolet, Υ rays, X-rays and so on. Although these radiations are invisible to the naked eye, they can be measured by instruments.
The wavelength of solar radiation is mainly 0.15-4 microns, of which the maximum wavelength of radiation is 0.5 microns on average; the wavelength of terrestrial and atmospheric radiation is mainly 3-120 microns, of which the maximum wavelength of radiation is 10 microns on average. It is customary to refer to the former as short-wave radiation and the latter as long-wave radiation.
People who work, study and live in an environment where radiation sources are concentrated are prone to insomnia, memory loss, physical weakness, low immunity, etc., and their cancer cells grow twenty-four times faster than those of normal people.
How far is radiation from us In our living environment, radiation is everywhere!
Household appliances: television, refrigerator, air conditioning, microwave ovens, vacuum cleaners, etc.
Office equipment: cell phones, computers, photocopiers, electronic instruments, medical equipment, etc.
Home decoration: marble, laminate flooring, wallpaper, paint, etc.
Surrounding environment: high-voltage lines, power substations, television (radio) signal transmission towers,
Natural environment: sunspots, etc.
How to avoid electromagnetic radiation pollution
With the rapid development of science and technology, a variety of scientific and technological products, household appliances into people's lives, all of which greatly improve people's work efficiency, improve people's lives, do not dare to imagine that, if there is no such electrically charged equipment people's lives will be how? However, with the city around the high-voltage electricity, transmission towers are getting higher and higher, more and more electrical equipment at home, people feel the convenience at the same time, but also in the harm. Electromagnetic radiation pollution has become the fourth largest environmental pollution after water, air and noise. If one day, you live in the house was suddenly told in the more serious electromagnetic radiation, how would you? Can you find out which of the many household appliances have higher levels of radiation? What is electromagnetic radiation? Professionally speaking, electromagnetic radiation is the phenomenon of energy traveling through space in the form of electromagnetic waves. Almost any electrical appliance in our home generates electromagnetic radiation. For example, microwave ovens, televisions, computers, cell phones and so on!
The difference between electromagnetic radiation and electromagnetic radiation pollution?
In fact, electromagnetic radiation and electromagnetic radiation pollution are two concepts, any electrically charged body has electromagnetic radiation, when the intensity of electromagnetic radiation exceeds the national standard, it will have a negative effect, causing different lesions and hazards of the human body, this part of the radiation exceeding the standard strength of the electromagnetic field is called electromagnetic radiation pollution.
What is the effect of cell phone base station radiation on the human body?
It is a relatively common phenomenon that cell phone base stations are installed on many residential buildings in urban areas. Some members of the public are concerned about whether the electromagnetic radiation generated by such a device will be harmful to the human body. In fact, this issue, there is no need to worry. The difference between cell phone radiation and cell phone base station radiation. Generally a cell phone has an electromagnetic radiation value between 0.03-0.7, while a cell phone base station has a radiation value of 10 microwatts. The value of radiation produced by a cell phone base station is not much higher than the value of a cell phone!
In addition, electromagnetic radiation is the closer the distance, the longer the radiation exposure, the deeper the damage suffered! The cell phone base station installed on the roof of our general residential building is a safe distance away from us, so we can rest assured!
What harm does electromagnetic radiation do to the human body?
Because each person's body resistance is different, each person will appear different degrees of symptoms. Generally polluted by electromagnetic radiation can cause headaches, insomnia, heart rate irregularities and other central nervous system problems. At the same time, for some people's eyes may have an impact, vision loss, skin diseases and other phenomena, heavy and may cause cancer. For pregnant women, it may lead to miscarriage, and elderly people with cardiac pacemakers should be especially careful. At the same time, different people or the same person at different ages on the tolerance of electromagnetic radiation is not the same, even in the excessive environment, does not mean that all people will get sick, so there is no need to electromagnetic radiation "grass". However, the elderly, children, pregnant women or patients with pacemakers, sensitive to electromagnetic radiation and long-term work in an environment of excessive doses of electromagnetic radiation should take precautions.
What items produce electromagnetic radiation?
We use household appliances in life, there is a certain amount of radiation, but the brands produced by regular manufacturers generally comply with the regulations, electromagnetic radiation will not exceed the standard, will not bring harm.
Professionals went into a resident's home, the gentleman's home electromagnetic radiation field test!
Mr. Zhang is a civil servant, due to work needs, his home appliances are particularly large, just three computers, two TVs, two microwave ovens, plus other electrical equipment operating at the same time, the release of electromagnetic radiation is certainly quite a lot, he heard from a friend that the electromagnetic radiation pollution may cause harm, in order to ensure that the family's health, especially to invite professionals to the home to carry out comprehensive The test was carried out by a professional at home.
We usually use the most computers, the test starts here, the tester shows that in 0.03 or so, around the TV seems to be a little higher, between 0.1-0.08, and cell phones are also often used, the test results are 0.3, obviously higher than the other two.
After the test home microwave oven radiation is the highest. That microwave oven radiation is excessive? The indoor environment testing center of the Zhou technician introduced, the amount of radiation in line with national regulations are qualified, it seems that Mr. Zhang's family do not have to worry about.
What measures should we take to protect ourselves from electromagnetic radiation?
Electromagnetic radiation is harmful, but in this electrical age, as long as you take some positive and effective protective measures, you can greatly reduce these hazards.
The more effective way of preventive measures is to buy some protective gear, which is necessary for housewives, pregnant women, and people who operate computers for a long time.
Protective clothing: including outerwear, vests, aprons, maternity clothes, etc., made of special fibers, has a better anti-electromagnetic radiation, anti-static effect. Especially families with microwave ovens, it is best to equip with protective aprons, which can effectively prevent electromagnetic radiation. For pregnant women if contact with electrical equipment, be sure to wear protective bibs or protective clothing to ensure the healthy growth of the fetus.
Anti-radiation screen: anti-radiation, anti-static, anti-glare and many other effects on the protection of eyesight also has a certain effect.
Another way is to pay attention to the time and distance.
The degree of damage is directly proportional to the time, that is to say, the longer the exposure to electromagnetic radiation, the greater the damage. And inversely proportional to distance, the distance is ten times greater, the radiation received is one percent of the original, and the distance is one hundred times greater, the radiation received is one ten thousandth of the original.
The specific electrical equipment protection at home is divided into:
One, microwave ovens
Warning Index: ★★★★★
Microwave ovens use microwaves with the thermal effect of this feature, to achieve the purpose of heating, cooking food. Studies have shown that microwave ovens produce strong electromagnetic waves that seriously exceed the standards may induce disease.
Response:
1, microwave ovens in the opening of the best left about one meter.
2, often use microwave cooking food can wear shielding apron, shielding coat.
3, microwave ovens in the use of 6 to 7 years after the best out of the update.
Two, the computer
Alert index: ★★★★★
Response:
1, if you have to use the computer for a long time, you should pay attention to wash your face in a timely manner.
2, the use of computers should maintain a correct posture, the distance between the person and the computer screen is best to maintain more than 70CM.
3, the back and sides of the computer electromagnetic radiation intensity is no less than the intensity of the screen, it is best to keep more than 120CM.
4, LCD monitors are less harmful to the human body.
Three, television
Watchfulness index: ★
Response:
1, the television should not be set up with other electrical appliances is too centralized, so that they are exposed to the dangers of ultra-dose radiation.
2, the distance between the TV set and a person should be at least 2 meters away, and should not be too close to the screen.
3, TV sets and other electrical appliances are best not placed in the bedroom.
Also note that, for many people, lying in bed reading, reading the newspaper is a life interest. But like the radio, Walkman, cell phones and other small appliances are not suitable for the bedside, so as to avoid electromagnetic radiation.
Finally, if the long-term in the source of electromagnetic radiation, the body feels uncomfortable, should be as soon as possible to find the relevant departments to monitor, test, find the source of radiation. Avoid long-term harm.