I'd appreciate it if you could help me
Granite, also called granite, is often used in tombstones and buildings. Granite often emits radiation because it contains high levels of radioactive isotopes such as potassium, uranium, and thorium. Uranium and thorium are solids, but when they decay to the element radon, they become gases and can be inhaled into the body through the lungs.
Therefore, it is better to ventilate caves and stone buildings that contain a lot of granite. Incidentally, radon is a heavy element and tends to accumulate below the ground, so it is advisable to ventilate with this in mind as well. Many buildings in the world are built of stone, so radiation exposure due to inhalation of radon and other elements is relatively high. Regarding in Japan, where most buildings are made of wood and ventilation is easy, radiation exposure through ---------inhalation is relatively low. However, because of the abundance of marine products, radiation exposure through ingestion is higher.
Granite is also found under the ground where we live, so we are all exposed to radiation emitted from the ground. In the Kansai region in Japan, the average exposure is higher than in the Kanto region because of the large amount of granite present. Okayama, Kagawa, and Miyagi prefectures are the main producers of granite.
Taken from the website of the Ministry of the Environment in Japan. The average annual exposure of Japanese people to natural radiation (food, cosmic rays, inhalation of radon and other substances, the earth, etc.) is 2.1 millisieverts per year.
If the granite buried in the ground is emitting radiation, shouldn't we stay off the ground too much? The answer is No. Because the higher you go up in the sky, the more likely you are to be exposed to radiation called cosmic rays. This is the reason why the exposure to radiation is higher when flying. Cosmic rays are radiation that travels through space, and many of them come to Earth. However, the Earth has an atmosphere that protects us from cosmic rays.
When we think of radiation, we immediately think of special cases such as atomic bombs, nuclear power, and X-rays (x-rays), but it is also something that is more familiar to us.
