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External irradiation refers to the radiation caused by radioactive substances to the human body from the outside. This radiation can come from various sources, such as radioactive elements in nature, building materials, medical equipment, nuclear reactors and so on. This paper will introduce the basic concept, source, influence on human body and protective measures of external irradiation in detail.
External irradiation refers to the radiation caused by radioactive substances to the human body from the outside. This kind of radiation is particles, photons or electromagnetic waves emitted by radioactive substances, which spread in the air or penetrate into the human body through the surface, thus causing harm to the human body.
The characteristic of external irradiation is that the human body does not directly contact radioactive sources, but contacts radioactive substances through the environment, food, water and other ways. There are many radioactive elements in nature, such as uranium, thorium and potassium
These elements will release radioactive particles or electromagnetic waves during the decay process, which will cause harm to human body. Some building materials contain radioactive elements, such as radon. These elements will release radioactive particles or electromagnetic waves, and long-term exposure to such an environment will cause harm to the human body. Nuclear reactor is an artificial radioactive source, and the radioactive substances released by it will cause great radiation damage to the surrounding environment and human body.
Refers to receiving large doses of radiation in a short time, such as radiation received during CT examination. Short-term exposure to radiation can cause mild symptoms, such as discomfort, headache and fatigue. Strengthening the protection and management of the environment and reducing the emission of pollution sources can reduce the content of radioactive substances in the environment and reduce the harm of external irradiation to human body.
In a word, external irradiation is a common radiation hazard factor, and we should take effective protective measures to reduce its harm to human body. At the same time, it is necessary to strengthen environmental protection and management, raise public awareness and understanding of radiation hazards, and create a safe and healthy living environment.