Analysis on the Radioactivity of Stone Materials
In the process of renovation, it is unavoidable to use various kinds of stone, but in recent years, with people's attention to decoration and environmental protection, the radioactivity of stone has also attracted attention. However, there are many types of stone, and the radioactivity is also different. Today, let us discuss with you the Stone Radioactivity.
The radioactivity of stone refers to the continuous emission of radioactive rays and radioactive gases to the surrounding environment due to the radioactive elements contained in the stone. The radioactivity of stone material can be generally divided into external radiation and internal radiation. External radiation is mainly caused by radiation emitted from uranium, radium, and thorium elements. It is harmful to the human body. Internal radiation is caused by the decay of radium in the course of radiation. It becomes a gas called helium, which has harm to the human respiratory system and digestive system, but it must reach a certain concentration to be harmful.
The National Standard for Stone Radioactivity, GB6566-2010, “Limits for Radioactive Nuclides in Building Materials” is divided into three categories according to the different radioactivity levels of decorative materials: Natural radionuclide radium-226, Radon, 232, The specific radioactivity of potassium-40 satisfies IRa≤1.0; Iγ≤1.3 requires Class A decorative materials. A type of decorative materials production and use of unlimited scope.
Class B decoration materials do not meet the requirements of Class A decorative materials but at the same time satisfy IRa ≤ 1.3; Iγ ≤ 1.9 requirements are class B decoration materials. Class B decoration materials shall not be used for the interior surfaces of Class I civil buildings and shall only be used for the exterior finishes of Class I civil buildings and the interior and exterior finishes of all other buildings.
Class C decoration materials that do not meet the requirements of Class A and Class B decorative materials but meet the requirements of IRa ≤ 2.8 can only be used for exterior finishes of buildings and other outdoor uses; IRa ≥ 2.8 can only be used for stele, seawalls, bridge piers, etc. Places rarely touched by humans.
Note: Type I civil buildings: such as residences, elderly apartments, nurseries, hospitals and schools.
Class II civil buildings: such as shopping malls, stadiums, bookstores, hotels, office buildings, libraries, cultural and entertainment venues, exhibition halls, and public transportation waiting rooms.
Stone radiation hazards: On the one hand a large dose of radiation it will increase the chance of inducing cancer cells in the body; on the other hand, large doses of radiation it will directly kill human cells, disrupting the body's metabolism.
Stone radiation hazard solution
1. If the stone is not yet installed, when purchasing the stone decoration material, be sure to check the “CMA Radioactive Analysis Test Certificate” certified by the State Bureau of Technical Supervision and the scope of application of the product, and carefully check whether it is the one you purchased yourself. The stone test certificate is purchased and used according to the applicable scope stipulated by the national standards.
2. If the stone has been installed, if it is inadvertently mistaken to decorate the “Super A” product in the family home, maintaining good indoor ventilation is the simplest and most effective method for removing radioactive substances.
Correctly Treating Stone's Radioactivity
1. There are different numbers of (albeit traces or traces) of radioactive elements in all types of rock (natural stone), soil and seawater. Naturally occurring low concentrations of radioactive radiation not only do no harm to human health, but it is already part of the natural balance system. Humans and all lives have fully adapted to the living environment of such balanced systems.
2. The total radioactive radiant intensity of marble, most slabstones, dark series (including black in black, blue, and dark), and gray series of granites are within the category A product, but if there is Conditions should be used after testing.
3, radioactive exceeding the stone is mostly: bright red series, bright green series and Freckle series of granite, these stones must be tested after use. However, the proportion of these excessive stones is very small.
4. The source of stone radiation is mainly related to the magma formation process. It is related to the mine from which the material is taken. It is related to its chemical composition and has no direct relationship with its color. Therefore, it cannot directly distinguish the level of radioactivity from the color of the stone. Stones have great differences in their radioactivity due to their different mining sites, mineral deposits, and origins. Therefore, the use of detection is the most secure and safest method.
5. Radioactivity of stone is not the only source of indoor pollution because:
1. The helium gas present in the soil is constantly released to the outside, so the helium content in the basement and the basement of the building is relatively high;
2. The content of radioactive materials in wall bricks made of coal ash slag is sometimes higher than that of granites with certain special minerals.
3. In the coating and decoration materials of various chemical substances used in interior decoration, some harmful gases will be continuously released, among which formaldehyde and benzene are the most harmful to the human body.
4. Various household appliances (televisions, refrigerators, computers, air conditioners, microwave ovens, etc.) must constantly release a small amount of micro-radiation