The three elements of radiation protection are described as follows:
The three elements of radiation protection are distance, time and shielding.
Distance protection. In the radiation field of the person exposed to the cumulative dose is proportional to the time, in the case of the same rate of exposure, shorten the exposure time can reduce the dose received, or people in the limited time to work, so that people receive the dose of radiation in the maximum permissible dose of radiation, so as to achieve the purpose of protection.
Time protection. The principle of time protection is that the cumulative dose of irradiation of people in the radiation field is proportional to the time, in the case of unchanged irradiation rate, shorten the irradiation time can reduce the dose received, or people in the limited time to work, so that people receive the radiation dose in the maximum permissible dose, so as to achieve the purpose of protection.
Shielding. Between the radiation source and the human body to place an effective absorption of radiation shielding material, can weaken the intensity of the radiation, so that people in the workplace to reduce the dose to the maximum permissible dose below, to ensure personal safety, to achieve the purpose of protection.
Expanded knowledge:
External exposure refers to the radiation caused to the human body by radioactive material from the outside. This radiation can come from a variety of sources, such as radioactive elements in nature, construction materials, medical equipment, nuclear reactors and so on. In this article, we will introduce in detail the basic concepts, sources, effects on the human body, and protective measures of external irradiation.
External irradiation refers to the radiation caused to the human body by radioactive substances from the outside. This radiation is caused by particles, photons, or electromagnetic waves emitted by radioactive substances that travel through the air or penetrate through surfaces to the inside of the human body, thus causing harm to the human body.
External exposure is characterized by the fact that the human body does not come into direct contact with the radioactive source, but is exposed to the radioactive material through the environment, food, water and other means. Many radioactive elements exist in nature, such as uranium, thorium and potassium.
These elements release radioactive particles or electromagnetic waves during the decay process, which can cause harm to the human body. Some building materials contain radioactive elements, such as radon gas. These elements will release radioactive particles or electromagnetic waves, and long-term exposure to such an environment causes harm to the human body. A nuclear reactor is an artificial source of radioactivity, which releases radioactive substances that cause great radiation damage to the surrounding environment and the human body.
Refers to receiving a large dose of radiation for a short period of time, such as the radiation received when undergoing a CT examination. Receiving radiation for a short period of time can cause minor symptoms such as discomfort, headache, and fatigue. Measures such as strengthening the protection and management of the environment and reducing the discharge of pollutants can reduce the level of radioactive substances in the environment and minimize the harm caused to the human body by external irradiation.
In conclusion, external irradiation is a common radiation hazard, and we should take effective protective measures to reduce its harm to the human body. At the same time, we should strengthen the work of environmental protection and management, to enhance public awareness and consciousness of radiation hazards, *** with the creation of a safe and healthy living environment.