What are the natural and artificial sources of ionizing radiation. What is their difference?

What are the natural and artificial sources of ionizing radiation. What is their difference? Why is radon dangerous? Give examples of artificial sources of radiation in everyday life.

The natural sources of ionizing radiation include cosmic radiation and natural radioactive substances located on the surface and in the bowels of the Earth, in the atmosphere, water, plants and organisms of living creatures that inhabit our planet. Sources of cosmic radiation are stellar explosions in the Galaxy and solar flares. Solar cosmic radiation does not lead to a noticeable increase in the radiation dose on the Earth’s surface. The annual dose of human exposure to natural sources is approximately 30-100 mbar (0.03-0.1 rem). There are five known geographical areas on our planet in which the natural background radiation is much greater than in others. These are Brazil, France, India, the island of Niue in the Pacific Ocean and Egypt. The population living in these areas was carefully examined, but no link was found between the increased level of radiation and biological disturbances.
Artificial sources of ionizing radiation are production associated with the use of radioactive isotopes, nuclear power plants, transport and research nuclear power plants, special military facilities, X-ray equipment and medical radiation therapy equipment, as well as household emitters. Unlike natural ones, artificial sources of ionizing radiation are a product of human labor.
One of the most common sources of radiation on Earth is radon. It is an invisible, tasteless and odorless heavy gas (7.5 times heavier than air). It is released from the earth’s crust everywhere. Its content in enclosed spaces is usually 8 times higher than on the street. The best protection against it is good ventilation of basements and living quarters. In addition, radon is found in water and natural gas. When boiling water, radon evaporates, but in raw water it is much more.
Therefore, the main danger it poses when taking a hot shower, when it enters the lungs of a person along with water vapor. Radon mixes with natural gas underground, and then, when burning domestic gas in stoves, other heating and heating appliances, it is released into the premises.
One of the most common sources of artificial ionizing radiation in everyday life is the TV. Studies have shown that a three-hour viewing of color television programs every day for a year causes irradiation of the entire human body, with an effective equivalent dose of 0.5-0.7 mbar.

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